DAYS 1-5 (MAY 7-11)

Upper level low pressure continues to impact our weather, but there will be a different overall feel today as we’re now in a warmer southerly air flow. We’ll also see breaks in the clouds and partial sun but this will fuel some convective showers and a few thunderstorms that can move across the region from mid afternoon through early evening. Activity can occur anywhere but will favor areas north of I-90, from west to east, and can produce brief downpours. A surface low associated with the upper low will wander eastward and we’ll find ourselves in slightly drier air behind it on Thursday. During that day, the shower chance will be minimal and we’ll have a northerly air flow, albeit light. But we’re not completely done with the foul weather associated with our blocking pattern, and another surface low will be evolving and moving into our area for late week. I’ve been leaning toward a slightly faster evolution and timing of this system. This means that the rain chance would increase as early as Thursday evening, and then be with us mostly during the day on Friday. What happens as we get to the weekend depends on the progression of low pressure. Some guidance has it slower-moving and wet weather lasting into Saturday. Other guidance keeps the system more progressive and moves it out more quickly. Either can occur, and I’m leaning toward a split with a slight tilt toward the quicker solution. I realize this goes against the general rule of thumb for spring blocking, so yes it’s a bit of an “out on the limb” prognostication. However, if this proves to be how it does go, we’d have improvement Saturday with just a possible lingering shower, and great weather Sunday, so the weekend would turn out pretty decent.

TODAY: Clouds break for sun at times. Scattered showers and isolated thunderstorms mid afternoon on. Highs 58-65 South of I-90, 65-72 I-90 northward. Wind SE to S up to 10 MPH.

TONIGHT: Variably cloudy. Patchy fog. Chance of a shower. Lows 50-57. Wind variable up to 10 MPH.

THURSDAY: Variably cloudy. Chance of a shower. Highs 65-72. Wind NW to N up to 10 MPH.

THURSDAY NIGHT: Cloudy. Showers likely. Lows 51-58. Wind N to NE 5-15 MPH.

FRIDAY: Cloudy. Rain likely. Temperatures generally steady 51-58. Wind NE 5-15 MPH.

FRIDAY NIGHT: Cloudy. Chance of rain. Lows 45-52. Wind NE 5-15 MPH.

SATURDAY: Mostly cloudy to partly sunny. Chance of showers. Highs 57-64. Wind NE to NW 5-15 MPH.

SATURDAY NIGHT: Partly cloudy. Lows 48-55. Wind NW up to 10 MPH.

SUNDAY: Partly sunny. Highs 65-72. Wind NW up to 10 MPH.

DAYS 6-10 (MAY 12-16)

No big changes to the previous outlook which suggests the blocking pattern reorganizes and coexists with some progression of the large scale features. This should give us a period of fair and milder weather early to mid next week before an unsettled weather threat evolves.

DAYS 11-15 (MAY 17-21)

Continuing to lean toward a hybrid partial blocking / partial progressive pattern. Overall this is a drier pattern with variable but mostly near normal temperatures, and no sharply defined weather systems in control.

DAYS 1-5 (MAY 6-10)

We’re still being dominated by an imposing letter from the Greek Alphabet. Yep, the Omega Block continues – not highly unusual for spring, in fact, fairly common for this season – more so than any other season (watch social media posts / headlines that try to tell you otherwise). This pattern often keeps the weather similar for several days. Sometimes, you can be in the fair weather sandwich in between two lows, underneath an upper ridge. We’re not. This time, we’re under the easternmost upper low, and it gave us a cool, wet Monday, and will do the same to our Tuesday. Yesterday, the main rain area got pushed back westward somewhat due to high pressure in Atlantic Canada. Today, that high gives ground and the rain wheels back through our region. Some embedded thunderstorms can also occur with it. Wednesday, we start to see less concentration of the moisture with slight weakening of the pattern, and with surface low pressure to the west we’ll have more of a southerly air flow. Result: Wednesday is still a mainly cloudy and occasionally showery (and chance of a thunderstorm) kind of day, but a little milder than today in general. The surface low makes its way across the area then east of our region Thursday. While I cannot rule out a shower that day, this looks like a drier day overall, but without complete clearing of the sky as clouds remain dominant. The puzzle to solve for late week is how much impact another low pressure area has on our region. Most guidance shows low pressure bringing another rain event sometime Friday into Saturday. Timing and magnitude varies from model to model, run to run of course. Nothing new there. The thing to watch when using guidance is the trend, and keeping a real-world eye on the pattern. For now, I remain of the meteorological opinion that we’re still under the gun for some additional wet weather there, favoring Friday with s-l-o-w improvement following. There’s the chance that the evolution of that system is further south and east, which would lessen the chance of a more pronounced impact.

TUESDAY: Cloudy. Shower coverage increases again – a few may be heavy with a slight chance of thunder. Areas of fog / drizzle. Highs 53-60. Wind E to SE 5-15 MPH.

TONIGHT: Cloudy. Showers likely. Areas of drizzle and fog. Lows 45-52. Wind E up to 10 MPH.

WEDNESDAY: Clouds break for sun at times. Scattered showers and isolated thunderstorms. Highs 56-63 South of I-90, 63-70 I-90 northward. Wind SE to S up to 10 MPH.

WEDNESDAY NIGHT: Variably cloudy. Patchy fog. Chance of a shower. Lows 50-57. Wind variable up to 10 MPH.

THURSDAY: Variably cloudy. Chance of a shower. Highs 60-67. Wind variable to N up to 10 MPH.

THURSDAY NIGHT: Mostly cloudy. Chance of a shower. Lows 48-55. Wind NE 5-15 MPH.

FRIDAY: Cloudy. Chance of rain. Highs 52-59. Wind NE 5-15 MPH.

FRIDAY NIGHT: Cloudy. Chance of rain. Lows 45-52. Wind NE 5-15 MPH.

SATURDAY: Mostly cloudy. Chance of showers. Highs 52-59. Wind NE to N 5-15 MPH.

DAYS 6-10 (MAY 11-15)

The blocking pattern relaxes and breaks down partially, but remains somewhat intact and coexistent with some pattern progression. May 11 (end of weekend / Mother’s Day) looks OK but not perfect, maybe a sun/cloud mix with a pop up shower, but this forecast will be fine-tuned. Fair weather more likely early to middle of next week including a warm-up, as high pressure should be in more firm control here.

DAYS 11-15 (MAY 16-20)

Continuing to lean toward a hybrid partial blocking / partial progressive pattern. Overall this is a drier pattern with variable but mostly near normal temperatures, and no sharply defined weather systems in control.

DAYS 1-5 (MAY 5-9)

The large scale omega block (low pressure western US, high pressure middle US, low pressure eastern US) configuration is the weather pattern during the next 5 days, and this is an unsettled / wet pattern for our area. The good news is we’ll get some additional drought relief. It’s not going to rain every moment of the next 5 days. There will be drier episodes, but you’ll have to get lucky to be able to take advantage of them. The steadiest rain in the area this morning gets pushed back to the southwest during the day today leaving us with drizzle and a few showers, but the rain makes a comeback tonight into Tuesday as the high pressure area in Canada that helped nudge it away relaxes enough to let it back in again. A surface low associated with the upper low controlling our weather will lift to the north and east midweek. Wednesday our air flow becomes more southerly and the rainfall turns more to a scattered shower / isolated thunderstorm pattern with milder air. We end up in a westerly to northerly flow on Thursday, and while there is still a shower threat, it may be the driest day of the five, because yet another low pressure area associated with the upper low will make a run at the region Friday with the opportunity for additional rainfall – coverage and timing TBD. There’s a slight chance that one stays further east and south, but don’t bank on it right now.

TODAY: Cloudy. Showers diminish north to south but areas of drizzle and a few showers continue. Highs 53-60. Wind NE 5-15 MPH.

TONIGHT: Cloudy. Showers regain coverage south to north. Patchy drizzle / fog. Lows 45-52. Wind E 5-15 MPH.

TUESDAY: Cloudy. Better chance of showers in all areas. Areas of drizzle and fog. Highs 53-60. Wind E 5-15 MPH.

TUESDAY NIGHT: Cloudy. Showers likely. Areas of drizzle and fog. Lows 45-52. Wind E up to 10 MPH.

WEDNESDAY: Clouds break for sun at times. Scattered showers and isolated thunderstorms. Highs 58-65 South of I-90, 65-72 I-90 northward. Wind SE to S up to 10 MPH.

WEDNESDAY NIGHT: Variably cloudy. Patchy fog. Chance of a shower. Lows 50-57. Wind variable up to 10 MPH.

THURSDAY: Variably cloudy. Chance of a shower. Highs 60-67. Wind variable to N up to 10 MPH.

THURSDAY NIGHT: Mostly cloudy. Chance of a shower. Lows 48-55. Wind NE 5-15 MPH.

FRIDAY: Cloudy. Chance of rain. Highs 55-62. Wind NE 5-15 MPH.

DAYS 6-10 (MAY 10-14)

The blocking pattern is expected to finally relax and break down during this 5-day period, which starts with the May 10-11 weekend. Will it happen fast enough for a beautiful weekend? Probably not. Expect additional unsettled weather, the details of which will be fine-tune later this week. Drier, mild weather is expected early next week.

DAYS 11-15 (MAY 15-19)

Going with a hybrid partial blocking / partial progressive pattern. Overall this is a drier pattern with variable but mostly near normal temperatures, and no sharply defined weather systems in control.

REVIEW OF SATURDAY

A very busy agenda for yours truly didn’t allow me to be on the blog as much as I’d like to have been, so I wasn’t able to comment during and shortly after the occurrence of strong to severe thunderstorms in the area. It’s important to remember something. Just because your area is in a warning for a storm does not necessarily mean your driveway ends up getting the strongest wind gust, the largest hail, the most damage, and consider yourself lucky if you miss out. There were some areas of pretty significant wind damage from this event, including right here in Woburn. Further west, I witnessed live wires down and entangled in down tree branches with the whole mess on fire in the middle of a road in Lexington. There were other significant damage reports, including but not limited to Newton MA and Hampton NH. A pretty impressive event for early in the season.

DAYS 1-5 (MAY 4-8)

Now, onto prognostication of the next 5 days, as we continue in a complex pattern which includes some blocking, quite typical for springtime. The large scale pattern features a closed low / high pressure ridge / closed low configuration from west to east across the Continental USA, with our area impacted by the easternmost upper low. Our summerlike air of yesterday is only a shadow of its former self as we start the day today, with it still quite mild, but a cool-down is in-bound, to be triggered by a southward-moving cold front that slides across the region during the day. The means much of the region will see high temperatures occurring this morning to midday. Additionally, we can see some rain showers around northern MA and/or southern NH to start the day, and a late-day return of showers, more numerous to the north and west of Boston while areas to the south see only isolated activity. Some consolidation of shower activity means most areas get wet Sunday night into Monday. As part of the blocking pattern, high pressure resides in Atlantic Canada, and it should exert enough push on our area to suppress the rain area to the southwest during the day Monday, which while remaining cloudy, will feature a trend to less rain / mainly dry. The high pressure area will lose its grip and the low will regain its influence on our region heading into Tuesday – a day likely to feature widespread showers. As we reach midweek, more changes come about as the blocking pattern loosens up and the upper low starts to lift north northeastward. This should allow our surface wind to shift from easterly to more southerly, but clouds and additional showers are possible as this transition occurs. By Thursday, a weaker version of the upper low will be over our region, and the sensible weather should feature lots of clouds and a few showers. There’s still some uncertainty in the midweek details, so check updates!

TODAY: Mostly cloudy. A spot shower possible. Highs 63-70 by midday, followed by a cool-down north to south. Wind SW to variable to N 5-15 MPH.

TONIGHT: Cloudy. Showers likely. Lows 46-53. Wind NE 5-15 MPH.

MONDAY: Cloudy. Showers diminish north to south but patchy drizzle. Highs 53-60. Wind NE 5-15 MPH.

MONDAY NIGHT: Cloudy. Showers regain coverage south to north. Patchy drizzle / fog. Lows 45-52. Wind E 5-15 MPH.

TUESDAY: Cloudy. Better chance of showers in all areas. Areas of drizzle and fog. Highs 53-60. Wind E 5-15 MPH.

TUESDAY NIGHT: Cloudy. Showers likely. Areas of drizzle and fog. Lows 45-52. Wind E up to 10 MPH.

WEDNESDAY: Clouds break for sun at times. Chance of a shower. Highs 58-65 South of I-90, 65-72 I-90 northward. Wind SE to S up to 10 MPH.

WEDNESDAY NIGHT: Variably cloudy. Patchy fog. Chance of a shower. Lows 50-57. Wind variable up to 10 MPH.

THURSDAY: Variably cloudy. Chance of a shower. Highs 60-67. Wind variable to N up to 10 MPH.

DAYS 6-10 (MAY 9-13)

Blocking remains dominant at least at first. Been trying to figure out if fair weather overtakes the region sooner or is delayed by another low pressure area early in the period. Leaning toward the latter, then a drier trend after. Further adjustment / fine-tuning will be needed for this part of the outlook. This is a slower pattern evolution than prognosticated on the previous blog post.

DAYS 11-15 (MAY 14-18)

Hints for a more progressive pattern though I’m not sold on a complete pattern switch. Current indications are for no well defined weather systems, but overall pattern more “dry” than “wet” and no temperature extremes.

DAYS 1-5 (MAY 3-7)

Another taste of summer will be with us today on the warm side of a frontal boundary that will take until sometime Sunday to make its way across the region from north to south. This will take place as high pressure in eastern Canada gains strength as part of a battle between Canadian cool air and southeastern US warmth that we often see in spring here in New England. But the warm side is in control today, and while it is, we’ll have to watch for some afternoon and evening showers and thunderstorms. But the timing of these seems late enough that areas that do see them still get through the bulk of the day rain-free. The focus for this activity will be west of I-95 late afternoon into early evening, with weakening remains swinging eastward during the evening. As is often the case at this time of year, the activity is likely to diminish as it approaches the coast due to marine stabilization and the loss of daytime heating. A few more showers may traverse the region tonight. As we move through Sunday, clouds are likely to be dominant, and while we’re still “in the warm air” initially, it won’t get as warm as today. The temperature rise will be thwarted and reversed during the day from north to south as the aforementioned frontal boundary moves through. However, I do think we are going to make it through much of Sunday’s daylight hours free of much rainfall too. It is at night when some overrunning over the boundary will likely create a ribbon of rainfall that wets the region down. The push of Canadian high pressure should be strong enough to get rid of most of that rain Monday, while we keep the clouds, and continue the cooling trend. This is part of a blocking pattern evolution that will find two closed lows (eastern and western US) sandwiching a ridge of high pressure (central US). The easternmost low will be what gives us additional unsettled weather Tuesday and Wednesday of next week with occasional showers. Still working out the finer details of those days…

TODAY: Sun/cloud mix, but clouds more dominant southeastern MA and South Coast along with areas of fog . Isolated to scattered showers and thunderstorms will favor areas west of I-95 mid to late afternoon, with a few storms possibly strong to (isolated) severe. Highs ranging widely from 56-63 South Coast to 78-85 inland areas mainly west of I-95. Wind S to SW 5-15 MPH.

TONIGHT: Mostly cloudy. Showers and thunderstorms likely north of I-90 early. A few additional showers possible late evening and overnight. Patchy fog. Lows 52-59. Wind SW up to 10 MPH.

SUNDAY: Mostly cloudy. A spot shower possible. Highs 63-70 by midday, followed by a cool-down north to south. Wind SW to variable to N 5-15 MPH.

SUNDAY NIGHT: Cloudy. Showers likely. Lows 46-53. Wind NE 5-15 MPH.

MONDAY: Cloudy. Showers diminish north to south. Highs 53-60. Wind NE 5-15 MPH.

MONDAY NIGHT: Cloudy. Showers possible mainly South Coast. Lows 45-52. Wind E 5-15 MPH.

TUESDAY: Cloudy. Better chance of showers in all areas. Highs 53-60. Wind E 5-15 MPH.

TUESDAY NIGHT: Cloudy. Showers likely. Lows 45-52. Wind E up to 10 MPH.

WEDNESDAY: Cloudy. Chance of showers / drizzle. Highs 53-60. Wind E up to 10 MPH.

DAYS 6-10 (MAY 8-12)

Blocking early to mid period but southward shift of features to allow high pressure to build in with drier weather, then a more progressive pattern evolves later in the period when we’ll have to watch for the arrival of a cooler airmass from Canada.

DAYS 11-15 (MAY 13-17)

More progressive pattern but overall this area in a trough position which allows for more Canadian cool shots with brief warm-ups between. The pattern can feature brief unsettled spells amidst mostly dry weather.

DAYS 1-5 (MAY 2-6)

We’re in an unsettled weather pattern, but that term “unsettled” is often misunderstood to mean days of rain, or miserably cool weather, etc. Clarification: Unsettled weather can describe changeable weather with several “systems” – high pressure / low pressure / fronts – impacting sensible weather conditions. This is also typical of springtime here in New England, whether in a progressive pattern where weather systems move right along, or a blocking pattern where they are in less of a hurry to move much. Over the next 5 days, we’ll see our set-up shift from progressive to blocking, and endure some changes that go along with that transition. Some of you may have been awoken by rumbles of thunder, or in some cases, crashes of it if it the triggering lightning was close enough, as a warm front moved through from west to east, bringing showers and thunderstorms with it. These have exited over the ocean, and our day today will feature clouds breaking for sun at times, except clouds more stubborn near the South Coast with a stronger direct low level moisture feed off the cooler ocean waters. A weak trough of low pressure approaching from the west can trigger isolated showers and a very low risk of a thunderstorm any time this afternoon or evening, but coverage on these is expected to be quite low. We stay in this “warm sector” with a southwesterly air flow through Saturday. It does appear we can make it through the morning and midday hours with minimal shower threat, but I cannot rule a few stray passing ones out completely – so keep this in mind if you have outdoors in your plans (sports, walks, yard sale hopping, etc.). We will have to keep a closer eye out for the development of showers and thunderstorms, particularly west of I-95, during the afternoon hours. A few of these could be strong with an isolated severe thunderstorm not out of the question. These would likely weaken / fall apart as they migrated closer to the coast late in the day. Part of the trigger of these will be an approaching cold front. The question the last couple of days has been what the timing of that front will be. It’s been a tough one to answer, but I do think it will slide southward across the region on Sunday, with a shower threat. Also, the timing of that front is critical to Sunday’s temperature forecast. A slower-moving front would allow Sunday to be a warmer day for a while with a cool-down coming later. A little quicker movement on the front will take the warmth out of the picture and Sunday will be a cooler day overall. I’m going for a slightly slow, but not too slow movement, so kind of a split between those 2 potentials. This is part of the evolution of blocking which will then put a closed upper level low over the northeastern US early next week, with cooler, mainly cloudy weather. The next question to answer will be how much rain to expect early in the week. There are some indications that eastern Canadian high pressure – part of the blocking pattern – will be strong enough to keep most rain to our south Monday, but may not quite have that ability to do so during Tuesday. So for now, I’m leaning toward less rain for “day 4” and more for “day 5”. Don’t hang your hat on this outlook yet though, because it’s not high confidence, and updates may very well result in notable adjustments in expectations for those days, but that’s the way it goes here in springtime.

TODAY: Clouds break for sun at times – least sun South Coast / most sun north of I-90. A stray shower and very slight chance of a thunderstorm, especially late-day, west of I-95 / north of I-90. Highs ranging from 55-62 Cape Cod / Islands to 73-80 inland with warmest north of I-90 / west of I-95. Wind S to SW increasing to 5-15 MPH with a few higher gusts.

TONIGHT: Mostly cloudy. A shower possible early. Fog patches. Lows 55-62. Wind SW 5-15 MPH.

SATURDAY: Partial sun but lots of clouds. Isolated to scattered showers and thunderstorms will favor areas west of I-95 during the afternoon, with a few storms possibly strong to (isolated) severe. Highs 58-65 Cape Cod, 66-73 remainder of South Coast region, 74-81 elsewhere. Wind SW 5-15 MPH, higher gusts.

SATURDAY NIGHT: Mostly cloudy. A chance of showers. Lows 50-57. Wind variable 5-15 MPH.

SUNDAY: Mostly cloudy. A chance of showers. Highs 58-65. Wind N 5-15 MPH.

SUNDAY NIGHT / MONDAY: Cloudy. Chance of rain, favoring southern areas. Lows 48-55. Highs 55-62. Wind NE 5-15 MPH.

MONDAY NIGHT / TUESDAY: Cloudy. Better chance of rain in all areas. Lows 46-53. Highs 53-60. Wind E 5-15 MPH.

DAYS 6-10 (MAY 7-11)

While there are indications of blocking continuing, enough of a shift in features should result in a drying trend. Temperatures start out below normal then moderate, more aggressively inland than near the coast.

DAYS 11-15 (MAY 12-16)

Current indications are a transition from blocking to progressive, but trough position with a tendency for Canadian cool shots. Brief wet weather interrupting an overall dry pattern.

DAYS 1-5 (MAY 1-5)

We’ll witness the evolution of a blocking pattern over the first 5 days of May. For our weather, it means a fair amount of spring variety upcoming. Today, we start the month with a pleasant day – a sun/cloud mix, not much wind but a coastal sea breeze, and dry weather. Clouds increase tonight and a few showers and perhaps a thunderstorm can visit ahead of a warm front. This front will push through, making our Friday warmer and more humid, with a chance of an additional shower or thunderstorm late in the day. A cold front will get close but initially won’t make it through here Friday night and Saturday, so we stay on the warm side of it, but with the opportunity for additional showers. The front should then be helped through with stronger high pressure in eastern Canada as we get to Sunday, making that a much cooler and still unsettled day as the shower threat lingers. Low pressure evolves south of our area Sunday and Monday, and while Monday looks like a cool day too (at day 5), the question is do we dry out with high pressure to the north being stronger, or see more wet weather with a weaker high and the ability of low pressure to the south to be closer? That question will be answered over the next few days…

TODAY: Sun/cloud mix. Highs 67-74 except cooler in most coastal areas. Wind variable up to 10 MPH with coastal sea breezes.

TONIGHT: Becoming mostly cloudy. A few showers and a slight chance of a thunderstorm overnight. Lows 53-60. Wind SE to S up to 10 MPH.

FRIDAY: Mostly cloudy to partly sunny. A shower or thunderstorm possible first thing in the morning favoring eastern areas, and later in the day favoring western areas. Highs 72-79 except cooler along the South Coast. Wind SW 5-15 MPH.

FRIDAY NIGHT: Mostly cloudy. A shower possible early. Lows 55-62. Wind SW 5-15 MPH.

SATURDAY: Mostly cloudy. Scattered showers. Highs 68-75, cooler South Coast. Wind SW 5-15 MPH.

SATURDAY NIGHT: Mostly cloudy. A chance of showers. Lows 50-57. Wind variable 5-15 MPH.

SUNDAY: Mostly cloudy. A chance of showers. Highs 58-65. Wind N 5-15 MPH.

SUNDAY NIGHT / MONDAY: Cloudy. Chance of rain, favoring southern areas. Lows 48-55. Highs 55-62. Wind NE 5-15 MPH.

DAYS 6-10 (MAY 6-10)

Uncertainty remains, but what is likely is the blocking pattern continues. Leaning wetter early, then a drying trend, with temperatures near to below normal.

DAYS 11-15 (MAY 11-15)

Expecting a blocking pattern to be dominant heading into mid May. Day-to-day details can’t be determined this far in advance, but our overall trend looks cooler and still somewhat unsettled.

DAYS 1-5 (APRIL 30 – MAY 4)

We’re about to say goodbye to April and this last day of the month will feature breezy, mild, but dry conditions behind a cold front. We’ll have some clouds, both patchy mid level leftovers drifting southeastward in the air flow behind the front, and some high cloudiness fanning up in the higher level southwesterly winds over the region, so sun will not be unlimited today. High pressure builds in tonight and Thursday. Thursday’s weather will be quite nice – more sun, less wind, mild, but a cooling sea breeze near the coast. High clouds do increase again later Thursday ahead of a warm front. Our next unsettled weather stretch is poorly timed for Friday into the weekend, but there are going to be some “nicer” times embedded in that stretch – a matter of working out the details in the shorter term over the next couple days to highlight them. The best guess at this point is that warm frontal showers (and a possible thunderstorm) occur in a several hour window Friday morning, and the approach of a cold front can trigger another shower or thunderstorm later in the day from west to east. The problem: This cold front is not likely to make a clean pass through the region, but get hung up, and allow another wave of low pressure to come up along it during Saturday. Some guidance holds rainfall back until later Saturday, or at night, while other guidance brings it in more hastily. I’m leaning toward the quicker scenario for this at the moment, with occasional showers any time that day. The front should be pulled through for a cooler Sunday, but it may remain somewhat unsettled as upper level low pressure swings through the region – so I can’t leave out the shower threat that day in the current version of the forecast.

TODAY: Sun/cloud mix. Highs 70-77. Wind NW 10-20 MPH, higher gusts.

TONIGHT: Mostly clear. Lows 46-53. Wind NW 5-15 MPH.

THURSDAY: Sunny through early afternoon, then increasing high clouds. Highs 67-74, cooler coast. Wind variable up to 10 MPH with coastal sea breezes.

THURSDAY NIGHT: Becoming mostly cloudy. A few showers and a slight chance of a thunderstorm overnight. Lows 53-60. Wind SE to S up to 10 MPH.

FRIDAY: Mostly cloudy. Chance of showers, favoring early-morning and late-afternoon, including a slight chance of thunderstorms. Highs 65-72. Wind S 5-15 MPH.

FRIDAY NIGHT: Mostly cloudy. A shower possible early. Lows 51-58. Wind SW to variable 5-15 MPH.

SATURDAY: Mostly cloudy. Additional showers likely. Highs 62-69. Wind variable 5-15 MPH.

SATURDAY NIGHT: Mostly cloudy. A chance of showers. Lows 50-57. Wind variable 5-15 MPH.

SUNDAY: Variably cloudy. A chance of showers. Highs 58-65. Wind NW 5-15 MPH.

DAYS 6-10 (MAY 5-9)

There’s a lot of uncertainty in the forecast for next week. Our various sets of guidance show different details, but the general idea is the evolution of a blocking pattern. The set-up of low pressure vs. high pressure determines wet weather (and magnitude of it) vs. dry weather, air flow and temperature. Current leaning: Fair weather May 5. Unsettled with marine air flow middle of next week. Fair weather end of week.

DAYS 11-15 (MAY 10-14)

Expecting a blocking pattern to be dominant heading into mid May. Again, unsettled weather vs. fair weather TBA, but suspect as features shift slightly we’ll have a bit of both. Some recent indications of wetter weather being pushed to the south and a drier, cooler scenario for this region. Will monitor trends on reliable guidance.

DAYS 1-5 (APRIL 29 – MAY 3)

High pressure moves offshore and a southwesterly air flow increases today between it and an approaching cold front. We’ll have a warm day as a result, but the South Coast will be cooler where a southwest wind comes off the ocean water. The aforementioned cold front may trigger a rain shower tonight as it moves through the region, and this will be followed by breezy, dry and only slightly cooler weather Wednesday. High pressure builds in for Thursday – a nice day but with a cooling sea breeze near the coast. Clouds start to move in later Thursday ahead of a warm front, and a this leads to an more cloud-filled Friday sky with rain showers possible both early in the day with a warm frontal passage, and late-day with an approaching cold front. Isolated thunderstorms are possible as well. Unfortunately, the trend for Saturday as for more unsettled weather as the cold front slows down and a wave of low pressure moves up along it, producing additional rain showers.

TODAY: Mostly sunny. Highs 58-65 Cape Cod, 66-73 remainder of South Coast, 74-81 elsewhere, warmest over interior valley locations. Wind SW increasing to 10-20 MPH with gusts over 20 MPH in the afternoon.

TONIGHT: Partly cloudy. A possible rain shower overnight. Lows 52-59. Wind SW 5-15 MPH, higher gusts.

WEDNESDAY: Mostly sunny. Highs 70-77. Wind NW 10-20 MPH, higher gusts.

WEDNESDAY NIGHT: Mostly clear. Lows 46-53. Wind NW 5-15 MPH.

THURSDAY: Sunny through early afternoon, then increasing high clouds. Highs 67-74, cooler coast. Wind variable up to 10 MPH with coastal sea breezes.

THURSDAY NIGHT: Becoming mostly cloudy. A few showers and a slight chance of a thunderstorm overnight. Lows 53-60. Wind SE to S up to 10 MPH.

FRIDAY: Mostly cloudy. Chance of showers, favoring early-morning and late-afternoon, including a slight chance of thunderstorms. Highs 65-72. Wind S 5-15 MPH.

FRIDAY NIGHT: Mostly cloudy. A shower possible early. Lows 51-58. Wind SW to variable 5-15 MPH.

SATURDAY: Mostly cloudy. Additional showers likely. Highs 62-69. Wind variable 5-15 MPH.

DAYS 6-10 (MAY 4-8)

Upper level low pressure brings a cool-down and still can trigger a shower May 4. Briefly fair May 5, then additional unsettled weather possible as upper level low pressure reorganizes nearby as a blocking pattern evolves. Temperatures variable – averaging not far from normal.

DAYS 11-15 (MAY 9-13)

Continued indications of a blocking pattern with upper level low pressure in control of our weather – an unsettled pattern with near to below normal temperatures.

DAYS 1-5 (APRIL 28 – MAY 2)

High pressure brings fair, warmer weather today and we’ll be rid of yesterday’s gusty wind. Cape Cod will be coolest due to ocean’s influence. High pressure shifts offshore tonight and Tuesday. An increasing southwesterly wind will keep more of the South Coast on the cooler side, while the remainder of the region sees its warmest day of the next five. Low pressure scooting quickly across southeastern Canada will drag a cold front quickly through the region, producing no more than a couple rain showers late Tuesday night / early Wednesday morning, and bringing a wind shift and a very slight temperature decline for Wednesday’s daytime highs. High pressure builds in Thursday with a day very similar to what we have today. You’ll see clouds on the increase later Thursday, however, in advance of a warm front which will move into and across the region through Friday, bringing unsettled weather – mild air, higher humidity, and a shower / thunderstorm threat to end the week.

TODAY: Mostly sunny. Highs 60-67 Cape Cod, 68-75 elsewhere. Wind NW 5-15 MPH, diminishing late.

TONIGHT: Clear. Lows 48-55, a few cooler pockets over interior valleys. Wind W under 10 MPH.

TUESDAY: Mostly sunny. Highs 58-65 Cape Cod, 66-73 remainder of South Coast, 74-81 elsewhere, warmest over interior valley locations. Wind SW increasing to 10-20 MPH with gusts over 20 MPH in the afternoon.

TUESDAY NIGHT: Partly cloudy. A possible rain shower overnight. Lows 52-59. Wind SW 5-15 MPH, higher gusts.

WEDNESDAY: Partly cloudy with a possible rain shower early then mostly sunny. Highs 70-77. Wind NW 10-20 MPH, higher gusts.

WEDNESDAY NIGHT: Mostly clear. Lows 46-53. Wind NW 5-15 MPH.

THURSDAY: Sunny through early afternoon, then increasing high clouds. Highs 67-74, cooler coast. Wind variable up to 10 MPH with coastal sea breezes.

THURSDAY NIGHT: Becoming mostly cloudy. A few showers and a slight chance of a thunderstorm overnight. Lows 53-60. Wind SE to S up to 10 MPH.

FRIDAY: Mostly cloudy. Chance of showers. Slight chance of thunderstorms. Highs 65-72. Wind S 5-15 MPH.

DAYS 6-10 (MAY 3-7)

Pattern turns unsettled as upper level low pressure evolves over the US Northeast. Initially, low pressure passes north of the region with a trough and cold front bringing a couple rounds of showers and possible thunderstorms to start the weekend on May 3, and an upper cool pool can trigger a shower on May 4. A brief fair weather interlude about May 5 is likely followed by additional unsettled weather later in the period.

DAYS 11-15 (MAY 8-12)

Strong indications of a blocking pattern with upper level low pressure in control of our weather – being an unsettled and near to below normal temperature pattern.

DAYS 1-5 (APRIL 27 – MAY 1)

While yesterday’s showery, humid weather have been pushed out by a cold front, we don’t get to enjoy a sunny, pleasant day today and here’s why. A pool of very cold air aloft will be crossing the region during the day today with upper level low pressure. This counterclockwise spin in the atmosphere and very cold air above relatively warmer air near the surface creates an unstable atmosphere, and even if there is sun (which some areas are seeing – or saw – early on in the day, clouds develop and fill in the sky and dominate, and there will be nothing more than limited breaks of sun for the balance of the day. The extensiveness of the cloud cover will limit the development of convective showers, but a few already exist with help from the mountains to our north, so I cannot rule out a passing rain shower at any point, starting right away in southern NH and far northern MA, and occurring anywhere later on, but again favoring those northern locations. For the most part, despite the extensive cloud cover, it will be rain-free. Additionally, if you have outdoor plans, you’ll have to contend with cool air (highs in the 50s), and blustery conditions (wind gusts above 20 MPH). Tonight, the upper low exits and clearing takes place. High pressure builds in Monday, then slides offshore Tuesday. These days will be fair with a warm-up. Early Wednesday morning, low pressure scoots rapidly across southeastern Canada and drags a quick-moving cold front through the region. Aside from a possible brief rain shower, this front will move through mainly rain-free, just featuring a wind shift and an ever-so-slight cool-down for Wednesday – nearly unnoticeable, along with a gusty breeze. High pressure then builds in for a lovely opening day of May on Thursday.

TODAY: Early sun mostly Boston area south, otherwise mostly cloudy. Isolated rain showers, favoring areas north of I-90. Highs 52-59. Wind NW 10-20 MPH, higher gusts.

SUNDAY NIGHT: Clearing. Lows 35-42. Wind NW 5-15 MPH.

MONDAY: Mostly sunny. Highs 63-70. Wind NW 5-15 MPH.

MONDAY NIGHT: Mostly clear. Lows 50-57. Wind W 5-15 MPH.

TUESDAY: Mostly sunny. Highs 70-77 except cooler South Coast. Wind SW 5-15 MPH, higher gusts.

TUESDAY NIGHT: Partly cloudy. A possible rain shower overnight. Lows 52-59. Wind SW 5-15 MPH, higher gusts.

WEDNESDAY: Partly cloudy. A possible rain shower early. Highs 68-75. Wind NW 10-20 MPH, higher gusts.

WEDNESDAY NIGHT: Mostly clear. Lows 46-53. Wind NW 5-15 MPH.

THURSDAY: Sunny. Highs 67-74, cooler coast. Wind variable up to 10 MPH with coastal sea breezes.

DAYS 6-10 (MAY 2-6)

Pattern turns unsettled as upper level low pressure evolves over the US Northeast. As far as day-to-day details, it’s too far in the future for those, but May 2, part of May 3, and May 6 are the most likely days to have wet weather chances for our region. Temperatures variable with an overall cooling trend indicated.

DAYS 11-15 (MAY 7-11)

A blocking pattern holds upper level low pressure over the Northeast much of this period with additional unsettled weather and below normal temperatures.

DAYS 1-5 (APRIL 26-30)

Down the home stretch of April 2025 we go! And it starts out with an unsettled weekend, but today will clearly be the wetter of the two days, as widespread rain showers are ours for the morning hours. While there are lulls, scattered rain showers and even a few downpours will be around this afternoon and evening until a cold front pushes through the region, at which time the threat will end. Sunday, upper level low pressure has to move across the region, with lots of cold air aloft. Any meaningful sun will be confined to eastern areas early in the day, otherwise the sky will be dominated by cold air cumulus / stratocumulus, another fairly typical springtime thing here. We’ll have a breezy, cool, and mainly dry day, but I cannot rule out some passing showers, triggered by the cold air aloft, particularly during the afternoon hours. The cold pool finally exits at night. This sets up fair weather and a warm-up early next week as high pressure moves in Monday, then slides off the coast Tuesday. A quick-moving cold front may deliver a rain shower early Wednesday before we get back to dry and breezy weather.

TODAY: Cloudy with widespread rain showers and patchy fog morning. Mostly cloudy with scattered rain showers afternoon. Highs 61-68, except 53-60 South Coast (coolest Cape Cod). Wind S to SW 10-20 MPH.

TONIGHT: Mostly cloudy with additional rain showers possible early. Lows 45-52. Wind shifting to NW 5-15 MPH with higher gusts.

SUNDAY: Partly sunny early, then mostly cloudy. A passing rain shower possible. Highs 53-60. Wind NW 10-20 MPH with higher gusts.

SUNDAY NIGHT: Clearing. Lows 35-42. Wind NW 5-15 MPH.

MONDAY: Mostly sunny. Highs 63-70. Wind NW 5-15 MPH.

MONDAY NIGHT: Mostly clear. Lows 50-57. Wind W 5-15 MPH.

TUESDAY: Mostly sunny. Highs 70-77 except cooler South Coast. Wind SW 5-15 MPH, higher gusts.

TUESDAY NIGHT: Partly cloudy. A possible rain shower overnight. Lows 52-59. Wind SW 5-15 MPH, higher gusts.

WEDNESDAY: Partly cloudy. A possible rain shower early. Highs 68-75. Wind NW 10-20 MPH, higher gusts.

DAYS 6-10 (MAY 1-5)

Fair weather probability highest May 1 & 5, book-ending an unsettled potential in the May 2-4 window. Details not possible this far in advance. Temperatures variable – averaging near normal.

DAYS 11-15 (MAY 6-10)

Spring blocking pattern. Additional unsettled weather. Variable temperatures – no extremes indicated.

DAYS 1-5 (APRIL 25-29)

The spring of 2025 rolls on and is starting to gain a bit of a reputation for being “not that nice”. Now this is only partially true, as it’s a matter of perspective and what amount of time you’re looking at. March was a rather dry and mild month, but with many people still in “winter mode” they don’t partake in the springtime activities outside, which explode in popularity in the month of April, especially around here when we approach and reach the weekend that includes Patriots Day (just this past week). But even before that, the “hibernating” folks come out for their first walks, yard work, etc., and like to be greeted with some good weather. And don’t get me wrong, we’ve had some nice days, but the timing of the unsettled days has been including at least parts of weekends much of this month, and the final weekend of April 2025 is going to be no different. Ouch! It’s not a total wash-out, but the weekend is not going to get high marks from the average person. How will it unfold? First, we have a warm front pushing through the region now, and abundant clouds are in the sky. This will be the case much of today, but there will be some intervals of sunshine as well. I can’t rule out a few rain showers migrating across the region, particularly over northern MA and southern NH. The frontal boundary also comes to a halt and may slip back to the south as a “temporary” back-door cold front, shutting the NH Seacoast and northeastern MA out of the warmer air with a light northeasterly air flow. Meanwhile, the south to southwest wind that overtakes the remainder of the region is naturally a cooler one for the South Coast and Cape Cod at this time of year, so they’ll be in much the same boat, temperature-wise, as southeastern NH and northeastern MA is today. During the weekend, we start with a fairly mild but unsettled Saturday as a trough and cold front have to move through, and won’t be in a grand hurry. Timing-wise, it looks like the most widespread rain showers will take place during the morning, with more “off” than “on” during the afternoon and evening, but we still have to watch for a couple batches of showers until the front passes through, and that doesn’t likely happen until the evening hours. So that means we’re in the clear for Sunday, right? Not so fast. Yup, we’ll be behind the cold front, and Sunday will certainly be a cool day regionwide, but many would take that in trade-off for sunshine. However, upper level low pressure has to move across the area. And those contain plenty of cold air aloft. If you get any sun, you pop abundant diurnal clouds, in addition to any existing cloud cover with the upper low to begin with, so I’m looking for very limited sunshine on Sunday, and also cannot rule out a passing rain shower. At least the rainfall threat will be rather isolated, and any that do occur would be rather brief, in comparison to Saturday’s showers. So if you have to pick a day for the better of the 2 for outside activity, it’s Sunday, that is if you can handle the gusty breeze we’ll have, making the 50s feel more like 40s at times. Sorry! 😉 But hey guess what? High pressure builds in just as the weekend wraps up, and fair weather and a warming trend will be with us as many head back to work (and back to school after vacation). Yep. Timing is everything! 😉

TODAY: Lots of clouds / limited sun. Maybe a rain shower, favoring areas north of I-90 and particularly northern MA and southern NH. Highs 55-62 South Coast as well as NH Seacoast to Cape Ann MA, 63-70 elsewhere (can break 70 inland areas with enough sun). Wind S to SW 5-15 MPH except NE up to 10 MPH southeastern NH and northeastern MA.

TONIGHT: Mostly cloudy. Patchy fog. An isolated rain shower evening. more widespread rain showers arrive west to east toward dawn. Lows 50-57. Wind S 5-15 MPH.

SATURDAY: Cloudy with widespread rain showers and patchy fog morning. Mostly cloudy with scattered rain showers afternoon. Highs 61-68, except 53-60 South Coast (coolest Cape Cod). Wind S to SW 10-20 MPH.

SATURDAY NIGHT: Mostly cloudy with additional rain showers possible early. Lows 45-52. Wind shifting to NW 5-15 MPH with higher gusts.

SUNDAY: Partly sunny early, then mostly cloudy. A passing rain shower possible. Highs 53-60. Wind NW 10-20 MPH with higher gusts.

SUNDAY NIGHT: Clearing. Lows 35-42. Wind NW 5-15 MPH.

MONDAY: Mostly sunny. Highs 63-70. Wind NW 5-15 MPH.

MONDAY NIGHT: Mostly clear. Lows 50-57. Wind W 5-15 MPH.

TUESDAY: Mostly sunny. Highs 70-77 except cooler South Coast. Wind SW 5-15 MPH.

DAYS 6-10 (APRIL 30 – MAY 4)

Warm April 30 but chance of a shower as a cold front approaches / passes. Fair, cooler May 1. Unsettled weather threat returns late May 2 into the first weekend of May – details TBD.

DAYS 11-15 (MAY 5-9)

Spring blocking pattern. Additional unsettled weather. Variable temperatures – no extremes indicated.

DAYS 1-5 (APRIL 24-28)

High pressure hangs on with fair weather across the region today. Temperatures will be fun to track for a while, starting with chilly morning lows followed by a quick rise that is thwarted by a coastal sea breeze, setting up a significant contrast in high temps between the coast and inland. A warm front will cross the region tonight and early Friday, perhaps with brief light rain for southern NH / northern MA though most areas stay dry. This front may try to slip back south southwestward as a back-door cold front into southeastern NH and possibly northeastern MA during Friday, so the temperature forecast is a bit tricky, and there may even be an additional rain shower or two near that boundary. A more significant warm sector push takes place Saturday with a southwesterly air flow across the region, but accompanied by lots of clouds and at least a couple rounds of rain showers. Still working on the timing / coverage forecast details for this, but for now just plan on an unsettled day in which it can rain at any time. Behind a cold front comes blustery, cooler weather for Sunday, with a sun/cloud mix as some cold air aloft causes some instability. There may be a diurnal rain shower or two (maybe some graupel if heavy enough?) across parts of the region, but overall look for a dry day. High pressure dominates Monday with fair weather, a chilly start, then a nice temperature recovery.

TODAY: Sunny to partly cloudy. Highs ranging from 50-57 immediate coast (coolest Cape Cod) to 68-75 inland (warmest interior valleys). Wind variable up to 10 MPH with coastal sea breezes up to 15 MPH.

TONIGHT: Variably cloudy with brief light rain possible northern MA and southern NH. Lows 45-52 evening, with a slow rise overnight. Wind SE shifting to SW up to 10 MPH.

FRIDAY: Sun/cloud mix. Highs ranging from 55-62 South Coast to 68-75 inland areas west of the I-95 belt, but may turn cooler southeastern NH and northeastern MA. Wind SW 5-15 MPH except possibly NE for a time in southeastern NH and northeastern MA.

FRIDAY NIGHT: Variably cloudy. Patchy fog. Lows 50-57. Wind S 5-15 MPH.

SATURDAY: Variably cloudy with rain showers likely. Highs 61-68, cooler Cape Cod. Wind SW 10-20 MPH.

SATURDAY NIGHT: Clearing. Lows 45-52. Wind W 5-15 MPH.

SUNDAY: Sun/cloud mix. A brief shower of rain (low chance of graupel mix) in the afternoon, favoring southern NH / northeastern MA. Highs 56-63. Wind NW 10-20 MPH, higher gusts.

SUNDAY NIGHT: Clearing. Lows 35-42. Wind NW 5-15 MPH.

MONDAY: Mostly sunny. Highs 63-70. Wind NW 5-15 MPH.

DAYS 6-10 (APRIL 29 – MAY 3)

Warmer weather April 29-30 with fair weather April 29 then a chance of a shower or thunderstorm with a cold front approaching during April 30. Watching for cooler and additional unsettled weather in the early days of May, but uncertain as to how the pattern is going to set-up during thiss period.

DAYS 11-15 (MAY 4-8)

Continued indications of blocking evolving with increase unsettled weather chances and variable temperatures.

DAYS 1-5 (APRIL 23-27)

Mother Nature has been giving us example of “classic spring scenarios” recently, and today / tonight / tomorrow will fit that category as well. We start today with some filtered sun as a canopy of high clouds, the one that provided a beautiful sunset yesterday for many areas, continues to slide across the sky, eventually shifting offshore. Meanwhile, there are some coastal areas, particularly Outer Cape Cod, that can’t see this at all early this morning under a blanket of marine stratus. A wind shift to the northwest should push this offshore as well over the next couple hours, and that northwesterly air flow will also limit how much sea breeze takes place today, but ultimately many coastal areas do end up cooler than inland this afternoon with a light sea breeze. Tonight, high pressure settles right over the region, and with a clear sky, this is the perfect set-up for radiational cooling, when the warmth of the day radiates quickly away from the surface and we chill down quickly. Under this set-up, inland valley locations end up the coldest, so some of the areas that end up the warmest this afternoon will end up the coldest tomorrow morning – classic spring set-up. Thursday, with high pressure still over the region, the light wind will allow for a more prominent sea breeze in the coastal plain, setting up a larger temperature contrast between the coast and interior for high temps. Additionally, with inland areas being the warmest in the afternoon after being the coldest in the morning, we’ll get an example of the large temperature “diurnals” (difference between low temp and high temp) that can occur in the spring. So you see, there can be a lot of weather to talk about even when you have high pressure and fair weather dominating. Moving onward, we’ll see an increase in high and middle clouds later Thursday ahead of a warm front. This front may produce some scattered rain showers across southern NH and perhaps far northern MA at some point Thursday night, and will lead a warmer air mass on a southwesterly air flow into the region on Friday, but of course this air flow is a cooler one for the South Coast, particularly Cape Cod. Additionally, getting the warm southwesterly air flow into all areas for the day is not a complete lock. All it takes is the tiniest wave of low pressure to form on that front just to the north and it gets pulled back, with the help of marine air, southwestward as a back-door cold front. This is a possibility especially Boston northward on Friday, so something to watch for. Looking ahead to the weekend, the next round of unsettled weather is due on Saturday as a cold front sweeps across the region, trailing form low pressure passing to our north. I’m not expecting a wash-out of a day, but as it looks now, I think two rounds of showers will occur, one with a pre-frontal trough, the other with the cold front itself. Timing and details will be fine-tuned as we get closer. Sunday will be a breezy, cooler, dry day with a sun/cloud mix behind the front.

TODAY: Limited sun at first Cape Cod / filtered sun at first elsewhere. Brighter sun all areas midday on. Highs 57-64 I-95 eastward / south of I-90, 65-72 elsewhere. Wind NW up to 10 MPH with light coastal sea breezes.

TONIGHT: Mostly clear. Lows 33-40 interior locations, coldest in valley areas, and 40-47 coastal plain, warmest in Boston. Wind calm.

THURSDAY: Sunny morning. Partly cloudy afternoon. Highs 57-64, 65-72 inland, but a more notable temperature fall in coastal areas after midday. Wind variable up to 10 MPH with coastal sea breezes up to 15 MPH.

THURSDAY NIGHT: Variably cloudy with brief light rain possible northern MA and southern NH. Lows 45-52 evening, with a slow rise overnight. Wind SE shifting to SW up to 10 MPH.

FRIDAY: Sun/cloud mix. Highs ranging from 55-62 South Coast to 68-75 inland areas west of the I-95 belt. Wind SW 5-15 MPH.

FRIDAY NIGHT: Variably cloudy. Patchy fog. Lows 50-57. Wind SW 5-15 MPH.

SATURDAY: Variably cloudy with rain showers likely. Highs 60-67, cooler Cape Cod. Wind SW 10-20 MPH, shifting to W from west to east by late-day.

SATURDAY NIGHT: Clearing. Lows 45-52. Wind W 5-15 MPH.

SUNDAY: Sun/cloud mix. Highs 58-65. Wind NW 10-20 MPH.

DAYS 6-10 (APRIL 28 – MAY 2)

Dry with a warming trend early in the period. A more unsettled pattern arrives to end April and start May with some wet weather possible.

DAYS 11-15 (MAY 3-7)

Continued indications of blocking evolving with increase unsettled weather chances and variable temperatures with an overall cooling trend.