7:20AM

DAYS 1-5 (APRIL 17-21)
Upper level low pressure tracks eastward across New England today, triggering scattered showers. High pressure brings fair weather Wednesday. Low pressure moves rapidly east and passes over or just south of southern New England during Thursday, which will be a wet day. Enough cold air may work in for some mixing with snow northwest of Boston at night, and a few rain and evening mixed rain/snow showers will occur behind the system Friday as the surface system departs but upper level low pressure will still have to cross the region. High pressure will build across eastern Canada by Saturday but this time it will be configured in such a way that it will deliver fair weather to the region with a northwest to north wind. Forecast details…
TODAY: Sunny to partly cloudy morning. Mostly cloudy with scattered showers afternoon. Highs 47-54. Wind SW to W 10-20 MPH.
TONIGHT: Mostly cloudy. Scattered rain and/or snow showers earoy. Lows 32-39. Wind W 10-20 MPH.
WEDNESDAY: Partly cloudy. Highs 48-55. Wind WNW 10-20 MPH, diminishing late.
WEDNESDAY NIGHT: Clouding over. Lows 34-40. Wind variable up to 10 MPH.
THURSDAY: Cloudy with periods of rain, may mix with snow far northwest of Boston at night. Highs 43-51. Wind E 10-20 MPH, shifting to N late.
FRIDAY: Mostly cloudy. Scattered rain/mix showers. Lows from the upper 30s to lower 40s. Highs from the middle 40s to lower 50s.
SATURDAY: Partly cloudy. Lows from the middle 30s to lower 40s. Highs from the upper 40s to middle 50s.

DAYS 6-10 (APRIL 22-26)
High pressure should protect the region with dry weather April 22-23. Low pressure threatens to bring wet weather sometime during the April 24-26 period. Temperatures mainly below normal.

DAYS 11-15 (APRIL 27-MAY 1)
A little more pattern amplification is possible but initially we may end up on the warm side of it and cannot rule out a couple very warm days before April ends.

8:17AM

DAYS 1-5 (APRIL 16-20)
Well the question of whether or not the Red Sox game on Patriots Day would be postponed for only the 5th time was answered yesterday, and that answer was yes, making 2018 join 1959, 1961, 1965, and 1984 as the only years the Marathon Monday baseball game was put off. The marathon on the other hand, well it would take a foot of snow or extremely severe weather to cause a postponement of that event, and since neither of those are very likely in mid April, despite our tendency to have some miserable weather at this time of year, it’s a good time to hold a rain or shine outdoor event. This year, it will be all about the rain and not at all about the shine, at least in terms of the sun. Hopefully all the participants will shine in their own way, from the elite competitors to those just joining in to see how far they can go and not worry about how long it takes them to get there. So while these participants battle themselves and in some cases other competitors, they will be battling the elements as well, in terms of cold, damp, wind, and wet weather. But keep in mind, many of them have trained long hours in equally harsh or even more harsh conditions in the weeks and months leading to this event, and they are not about to let a very unpleasant April day get in the way of their ultimate goal. When it comes down to it, today’s nasty weather will be more of a challenge for spectators than it will be for participants. I wish them all the best. So, the elements. We’ve talked about the weather system bringing this to the region, and now it’s time to watch it play out. The cold air hangs on, but temperatures in most locations by the early morning will be above freezing, erasing the late season icing and sleet that was deposited in the hours prior. It will take a little longer to accomplish this in portions of north central MA and southwestern NH where it stayed colder longer, and up to an inch of so of sleet accumulated, along with additional ice accretion. But with the warm air still hanging to the south of the region and riding up over the cold air at the ground we will continue to see plenty of drizzle and periods of rain. As we reach midday and afternoon, the warm air will continue to try getting in while at the same time, low pressure is approaching and pushing a cold front toward the region from the west southwest, lifting that warm air and resulting in a few bands of heavier showers, even possible thunderstorms, that will have to sweep through the region through evening. The timing of these should allow the elite runners to have finished their race, but for those still out on the course they will need to battle through this added element, along with the already chilly and damp conditions, which will include a moderate head wind to cross wind from the east to southeast. In short, this will be one of the harder races to run in, weather-wise, aside from some of the hotter days that have occurred in years gone by. Once all of this is through, we will have to deal with an upper level low pressure area crossing the region from west to east Tuesday, bringing the risk of additional rain showers, especially during the afternoon. At night, it may be cold enough for any additional showers to be in the form of mixed precipitation or snow which could briefly coat things. It’s along shot, but cannot rule it out. Once we get to Wednesday, it’s a quick nice day with high pressure in control before the next low pressure area brings unsettled weather in the form of rain Thursday and leftover rain showers Friday, although the air may be cold enough for some mix with snow in higher elevations well northwest of Boston late Thursday and for a few snow showers to be involved on Friday. Forecast details…
TODAY: Overcast with drizzle and periods of rain. Waves of heavier rain showers moving through from southwest to northeast during the afternoon including the chance of thunderstorms. Highs 42-47 southern NH and northern MA, 48-55 elsewhere, occurring late in the day. Wind E to SE 10-20 MPH with higher gusts.
TONIGHT: Variably cloudy. Areas of fog. Risk of a rain shower early. Temperatures generally steady 42-47. Wind S 5-15 MPH shifting to SW.
TUESDAY: Variably cloudy. Scattered rain showers. Highs 48-55. Wind SW 10-20 MPH.
TUESDAY NIGHT: Mostly cloudy. Scattered rain and/or snow showers. Lows 32-39. Wind W 10-20 MPH.
WEDNESDAY: Partly cloudy. Highs 48-55. Wind WNW 10-20 MPH.
THURSDAY: Cloudy with periods of rain, may mix with snow far northwest of Boston at night. Lows from the upper 30s to lower 40s. Highs from the upper 40s to middle 50s.
FRIDAY: Mostly cloudy. Scattered rain/mix showers. Lows from the upper 30s to lower 40s. Highs from the middle 40s to lower 50s.

DAYS 6-10 (APRIL 21-25)
High pressure builds in and should give the region fair weather for the April 21-22 weekend. Low pressure to the southwest and south should move up into the region with a chance of rain by April 24 with fair weather returning at the end of the period. Temperatures near to below normal.

DAYS 11-15 (APRIL 26-30)
Some changeable weather at the end of the month as the pattern tries to amplify further, slowing weather systems down. One or 2 sneaky warm days are possible in here but this would not be the start of long-term warming quite yet as Canada remains fairly chilly for some time to come.

7:29AM

DAYS 1-5 (APRIL 15-19)
Your Sunday morning post has no real changes, so just updating basically the same forecast that was posted Saturday morning, and that is the unseasonable cold today including some scattered rain and sleet and a few pockets of freezing rain through this evening, a round of heavier showers sometime on Monday, and drier weather arriving later Monday night into Wednesday. A few details… Still looking for any freezing rain to be confined to mainly interior northern MA and southern NH, the heaviest rain on Monday to occur after many of the Boston Marathon runners have finished, and an upper low coming across the region Tuesday still bringing the risk of a little bit of unsettled weather. The middle of next week will feature a split with high pressure and fair weather Wednesday and an arriving low bringing unsettled weather Thursday. Updated forecast details…
TODAY: Overcast with areas of fog. Scattered sleet, rain, and pockets of freezing rain favoring interior northern MA and southern NH. A small accumulation of sleet possible. Temperatures steady 32-38. Wind NE 5-15 MPH, higher gusts.
TONIGHT: Overcast with areas of fog. Periods of rain possibly mixed with sleet early. Temperatures rise slightly to 34-40. Wind E 10-20 MPH, higher gusts.
MONDAY: Overcast with areas of fog. Periods of light rain/drizzle morning. Rain showers likely during the afternoon, some possibly heavy especially late-day including the chance of a thunderstorm. Highs 40-48 north central MA and southwestern NH, 48-55 elsewhere but may spike to 55-62 interior southern MA, RI, and eastern CT. Wind E 10-20 MPH with higher gusts shifting to SE, may shift to S in some southern areas later in the day.
MONDAY NIGHT: Mainly cloudy with rain showers early then partly cloudy. Lows 37-43. Wind S shifting to W 10-20 MPH with higher gusts.
TUESDAY: Variably cloudy. Scattered showers of rain possibly mixed with snow. Highs 44-49. Wind W 10-20 MPH with higher gusts.
WEDNESDAY: Mostly sunny. Lows in the 30s. Highs in the 50s.
THURSDAY: Mostly cloudy. Chance of rain. Lows in the 40s. Highs in the 50s.

DAYS 6-10 (APRIL 20-24)
Active but mostly progressive pattern with another 1 or 2 low pressure systems bringing wet weather threats. Temperatures below normal.

DAYS 11-15 (APRIL 25-29)
Transition to a more amplified pattern with slower-moving weather systems. Additional unsettled weather is likely to impact the region at some point during this period but there is a better chance of at least a brief warm-up especially prior to unsettled weather.

9:15AM

DAYS 1-5 (APRIL 14-18)
It is typical this time of year to see a back-door cold front and a significant temperature drop. This particular case is stronger because of how cold eastern Canada is, so the temperature drop till be to levels that result in some frozen and freezing precipitation by Sunday. Today’s temperature drop will be accompanied by largely dry weather but an increase in clouds. And then we turn our attention to Sunday’s cold and very late taste of winter. Back some time ago I expressed concern of a very late winter event. Will this count as that event? Time will tell. Of more immediate importance is the weather for Patriots Day Monday. We have to first see where that boundary that today is the back door, coming back as a warm front, makes it to. I’m going to split the difference at this point and bring it about half way through the region before a stronger cold front sweeps through from the west Monday night. Before all that we have additional wet weather, including a band of heavier rain showers associated with the front from the west. Timing of that is crucial for the Boston Marathon, but so far I think a lot of the race may be finished before that arrives. However that doesn’t save the region from wet weather prior to that, and very likely wet enough to rain out the midday Patriots Day Red Sox game for only the 5th time. Once we get beyond all this, Tuesday will also be unsettled as upper level low pressure crosses the region, but clouds and cool air will be more of the story than any precipitation, which will only be scattered. And then we will sneak in a quick nicer day on Wednesday as a small area of high pressure moves in. Forecast details…
TODAY: Increasing clouds. Highs 48-55 eastern MA and southeastern NH, 56-64 elsewhere, occurring this morning, then falling into the 40s all areas from north to south. Wind light variable becoming N to NE 5-15 MPH with higher gusts from north to south.
TONIGHT: Overcast. Areas of fog. Drizzle developing evening. Episodes of rain and sleet overnight. Lows 32-38. Wind NE 5-15 MPH, higher gusts.
SUNDAY: Overcast with areas of fog. Periods of rain, freezing rain, and sleet, with the icing most likely in pockets of interior northern MA and southern NH. A small accumulation of sleet possible. Temperatures steady 32-38. Wind NE 5-15 MPH, higher gusts.
SUNDAY NIGHT: Overcast with areas of fog. Periods of rain possibly mixed with sleet early. Temperatures rise slightly to 34-40. Wind E 10-20 MPH, higher gusts.
MONDAY: Overcast with areas of fog. Periods of light rain/drizzle morning. Rain showers likely during the afternoon, some possibly heavy especially late-day. Highs 40-48 north central MA and southwestern NH, 48-55 elsewhere but may spike to 55-62 interior southern MA, RI, and eastern CT. Wind E 10-20 MPH with higher gusts shifting to SE, may shift to S in some southern areas later in the day.
TUESDAY: Variably cloudy. Scattered showers of rain possibly mixed with snow. Lows from the upper 30s to lower 40s. Highs from the middle to upper 40s.
WEDNESDAY: Mostly sunny. Lows in the 30s. Highs in the 50s.

DAYS 6-10 (APRIL 19-23)
Active but mostly progressive pattern with at least 2 low pressure systems possibly impacting the region with additional wet weather. Temperatures mostly below normal.

DAYS 11-15 (APRIL 24-28)
Pattern transition may begin with more of an amplified pattern with slower-moving weather systems. Unsure where this area ends up just yet but as transition begins we’ll still see a couple episodes of unsettled weather and overall below normal temperatures.

12:06PM

DAYS 1-5 (APRIL 13-17)
Brief warmth today. Strong back door cold front arrives Saturday driven by building high pressure in eastern Canada, returning the chill to the region during the course of the day, then remaining in the region for much of the holiday weekend including into Monday. The biggest questions remain for Monday are whether or not that boundary moves back much to the north ahead of a stronger low pressure system and cold front from the west, and the timing of a ribbon of heavier rain showers associated with the stronger cold front, especially with regard to the Boston Marathon and a Red Sox game. The Patriots Day Red Sox game has only been rained out 4 times (1959, 1961, 1965, and 1984). Detailed forecast…
TODAY: Variably cloudy. Highs 53-59 South Coast, 60-66 elsewhere except 67-75 interior valleys. Wind SW 5-15 MPH.
TONIGHT: Partly cloudy. Lows 48-55. Wind light SW to W.
SATURDAY: Partly cloudy then becoming cloudy from northeast to southwest with possible drizzle/fog by evening. Highs ranging from 55-63 southern NH and northern and eastern MA and 64-72 to the south except cooler South Coast, then falling through the 50s to the 40s in all areas from northeast to southwest during the day and to the upper 30s at night. Wind shifting to NE 5-15 MPH.
SUNDAY: Overcast with areas of fog/drizzle and a chance of rain possibly mixed with sleet. Temperatures steady middle 30s to lower 40s.
MONDAY: Cloudy. Areas of fog/drizzle. Chance of rain. Band of heavier rain showers favoring later in the day. Lows from the upper 30s to lower 40s. Highs ranging from the middle 40s north to lower 60s south but low confidence temperature forecast at this time.
TUESDAY: Variably cloudy. Isolated rain showers. Lows in the 30s. Highs from the upper 40s to lower 50s.

DAYS 6-10 (APRIL 18-22)
Expect a progressive but active pattern with a few episodes of unsettled weather and temperatures averaging mostly below normal.

DAYS 11-15 (APRIL 23-27)
The pattern of days 6-10 continues at least into the start of this period. It may try to warm somewhat later in the period.

7:33AM

DAYS 1-5 (APRIL 12-16)
A warm front approaches today and passes tonight, preceded by clouds and a little wet weather, then in comes a shot of warmer air for Friday into very early Saturday before the boundary that introduced it comes back to the south, pushed by building high pressure in eastern Canada, returning the chill to the region during the course of the day Saturday, then remaining in the region for much of the holiday weekend including into Monday. The biggest questions remain for Monday are whether or not that boundary moves back much to the north ahead of a stronger low pressure system and cold front from the west, and the timing of a ribbon of heavier rain showers associated with the stronger cold front, especially with regard to the Boston Marathon and a Red Sox game. The Patriots Day Red Sox game has only been rained out 4 times (1959, 1961, 1965, and 1984). There are still a few days to fine-tune the timing of that. Onto the detailed forecast…
TODAY: Increasing clouds. A period of light rain late day and evening favoring Boston area northward. Highs 43-50, coolest along the coast. Wind SE up to 10 MPH.
TONIGHT: Mostly cloudy with a chance of light rain early, then partly cloudy with patchy fog. Temperatures steady 43-50 evening, rising to the lower 50s overnight. Wind SW up to 10 MPH.
FRIDAY: Mostly sunny morning. Partly sunny afternoon. Highs 53-59 South Coast, 60-66 elsewhere except 67-75 interior valleys. Wind SW 5-15 MPH.
FRIDAY NIGHT: Partly cloudy. Lows 48-55. Wind light SW to W.
SATURDAY: Partly cloudy except becoming cloudy from northeast to southwest late-day with possible drizzle/fog by evening. Highs ranging from 55-63 southern NH and northern and eastern MA and 64-72 to the south except cooler South Coast, then falling through the 50s to the 40s in all areas from northeast to southwest during the day and to the upper 30s at night.
SUNDAY: Overcast with areas of fog/drizzle and a chance of rain possibly mixed with sleet. Temperatures steady middle 30s to lower 40s.
MONDAY: Cloudy. Areas of fog/drizzle. Chance of rain. Band of heavier rain showers favoring later in the day. Lows from the upper 30s to lower 40s. Highs ranging from the middle 40s north to lower 60s south but low confidence temperature forecast at this time.

DAYS 6-10 (APRIL 17-21)
Expect a progressive but active pattern with a few episodes of unsettled weather and temperatures averaging mostly below normal.

DAYS 11-15 (APRIL 22-26)
The pattern of days 6-10 continues at least into the start of this period. It may try to warm somewhat later in the period.

2:58AM

DAYS 1-5 (APRIL 11-15)
High pressure dominates today with fair mostly fair weather, but it’s not just that simple in the pattern, even on a “nice” day. Some of you, especially north of Boston, may encounter a dense fog to start the day and some may encounter a very frosty vehicle if heading out early in the day. There may also be a brief pop-up shower somewhere in eastern MA or nearby southern NH or northern RI along the boundary of a sea breeze which will form during the day and push slightly inland. A warm front approaches Thursday and the region briefly enters the warm sector from late Thursday night to sometime Saturday morning before the boundary is forced southward again by building high pressure in eastern Canada, a set-up typical for springtime in New England. By Sunday, low pressure will be approaching from the west, helping to add moisture to the mix as an onshore flow increases ahead of it and south of the high pressure area. Forecast details…
TODAY: Areas of fog mainly north and northwest of Boston early to mid morning. Partly sunny. Slight risk of an afternoon rain shower mainly eastern MA, southeastern NH, and northern RI. Highs 42-47 coast, 48-53 interior. Wind W up to 10 MPH interior but coastal sea breezes.
TONIGHT: Partly to mostly cloudy. A brief of very light rain or snow possible overnight. Lows 33-40. Wind variable up to 10 MPH.
THURSDAY: Partly sunny morning. Mostly cloudy afternoon. A period of light rain late day. Highs 43-50. Wind SE up to 10 MPH.
THURSDAY NIGHT: Mostly cloudy with a chance of light rain early, then partly cloudy with patchy fog. Temperatures steady 43-50 evening, rising to the lower 50s overnight. Wind SW up to 10 MPH.
FRIDAY: Partly cloudy. Highs 53-59 South Coast, 60-66 elsewhere except 67-75 interior valleys. Wind SW 5-15 MPH.
SATURDAY: Partly cloudy except becoming cloudy from northeast to southwest late-day with possible drizzle/fog at night. Lows from the upper 40s to lower 50s. Highs from the middle 50s to lower 60s morning, falling rapidly to 40s northeast to southwest by midday or afternoon, and more slowly to 30s at night.
SUNDAY: Overcast with areas of fog/drizzle and a chance of rain possibly mixed with sleet. Temperatures steady middle 30s to lower 40s.

DAYS 6-10 (APRIL 16-20)
April 16 (Patriots Day, Marathon Monday) is an important day in the region with a Red Sox game and the Boston Marathon taking place. Based on current timing, a ribbon of rain showers, possibly heavy, will have to cross the region from west to east, but the 2 big questions at this point will be timing of the heaviest rainfall and also whether or not any part of southern New England gets back into the warm air mass ahead of the main cold front from the west. Neither of these questions can be concretely answered 5 days in advance. Expecting drier air to arrive from the west by the middle of next week but a cold pool of air aloft arriving later in the period will bring the risk of some unsettled weather. Temperatures for the period will average generally below normal.

DAYS 11-15 (APRIL 21-25)
With the tendency for Canada to remain cold, warm air to be suppressed well to the south in the US, and a parade of disturbances transiting from the Pacific to the Atlantic via North America, it’s fair to say that an unsettled pattern and below normal temperatures will continue to be the rule into if not through this period.

7:39AM

DAYS 1-5 (APRIL 10-14)
Low pressure passes southeast of New England today and tonight and a trough connecting it to a weaker system passing north of the region will bring cloudiness and patches of very light precipitation to the region today. A sliver of high pressure will bring fair weather Wednesday. A warm front / cold front combo will bring clouds and a risk of some light rain Thursday then clearing for Friday. The computer models want to bring that front back to the north during Friday and put much of southern New England on the warm side through Saturday, but I am nervous about going for this scenario and will continue to lean to the cooler side at least for northern and eastern areas for now.
TODAY: Mostly cloudy. A period or two of light snow/mix/rain possible. Highs 38-45. Wind light SE.
TONIGHT: Mostly cloudy. Lows 30-37. Wind light S shifting to W.
WEDNESDAY: Mostly sunny. Highs 48-55. Wind W 5-15 MPH.
WEDNESDAY NIGHT: Increasing clouds. Lows 33-39. Wind light variable.
THURSDAY: Mostly cloudy. Chance of light rain. Highs 47-54. Wind light SE.
FRIDAY: Partly cloudy. Lows from the upper 30s to lower 40s. Highs from the middle to upper 50s except cooler coastal areas. Low confidence temperature forecast.
SATURDAY: partly cloudy. Lows from the upper 30s to lower 40s. Highs from the upper 40s to middle 50s coast, middle 50s to lower 60s interior. Very low confidence temperature forecast.

DAYS 6-10 (APRIL 15-19)
Expecting to be on the cool side of that front April 15 with wetter weather developing. The front may try to push north of the region April 16 (Patriots Day / Marathon Monday) so will have to watch for a jump in temperature possible at that time and also for an area of showers ahead of a cold front from the west. Much cooler and mostly dry or a few rain/snow showers around the middle of the period then a slight moderation as a low pressure trough transitions eastward across the region.

DAYS 11-15 (APRIL 20-24)
Look for a progressive pattern but frequent precipitation threats and temperatures averaging mostly below normal.

2:46PM

DAYS 1-5 (APRIL 9-13)
High pressure is bringing a bright but cool day to the region today. A disjointed low pressure system – main system well south, weaker system passing over and north of the region, will bring cloudiness and a minimal precipitation threat Tuesday. Sliver of high pressure brings fair weather Wednesday. A warm front / cold front combo will bring clouds and a risk of some light rain Thursday then clearing for Friday. During Friday that front should be settling just south of the region, setting up an interesting weekend forecast. But first, the details through Friday…
REMAINDER OF TODAY: Sunshine. Temperatures holding in the 40s. Wind NW 5-15 MPH gusting around 20 MPH.
TONIGHT: Clouding up. Lows 27-34. Wind light variable.
TUESDAY: Mostly cloudy. A period or two of light rain possible. Highs 38-45. Wind light SE.
TUESDAY NIGHT: Mostly cloudy. Lows 30-37. Wind light S shifting to W.
WEDNESDAY: Mostly sunny. Highs 48-55. Wind W 5-15 MPH.
THURSDAY: Mostly cloudy. Chance of light rain. Lows in the 30s. Highs from the upper 40s to middle 50s.
FRIDAY: Partly cloudy. Lows from the upper 30s to lower 40s. Highs from the middle to upper 50s except cooler coastal areas.

DAYS 6-10 (APRIL 14-18)
The position of a frontal boundary means everything regarding the temperature forecast during the weekend of April 14-15. A frontal boundary in northern New England means that much of the region, except where wind comes off the ocean, could exceed 70. However, instinct tells me to lean toward this front struggling to come north and the cooler air winning out. This would do so with mainly fair weather Saturday April 14 but by Sunday April 15 clouds and eventually wet weather may figure into the mix as well. Then the timing of a front from the west has to be considered regarding both temperatures and precipitation threat for Monday April 16, Patriots Day a.k.a. Marathon Monday. Toward the middle of next week, fair weather should be back in place.

DAYS 11-15 (APRIL 19-23)
Look for a progressive pattern but frequent precipitation threats and temperatures averaging mostly below normal.

8:02AM

DAYS 1-5 (APRIL 8-12)
A wave of low pressure pulls away from New England over the Atlantic today. A disturbance coming through this evening will produce a few isolated to scattered snow showers and reinforce a batch of cold air for the start of the week. Regarding the low pressure system approaching Tuesday, still looking like a weak system for this area as the main southern energy misses to the south and the weaker northern energy moves through, with the 2 waiting until being east of New England to phase up. A weak area of high pressure moves in Wednesday with dry weather before sliding off to the east allowing a warmer push of air ahead of a cold front on Thursday.
TODAY: Mostly to partly cloudy. Highs 39-46. Wind N 5-15 MPH.
TONIGHT: Variably cloudy with a passing snow shower possible evening. Clearing overnight. Lows 18-30, coldest north and west of Boston. Wind N 5-15 MPH, higher gusts.
MONDAY: Sunny. Highs 38-45. Wind NW 5-15 MPH.
MONDAY NIGHT: Increasing clouds. Lows 28-35. Wind light variable.
TUESDAY: Variably cloudy. Scattered areas of light rain/mix/snow possible mainly late in the day. Highs 38-45. Wind light variable.
WEDNESDAY: Partly cloudy. Lows in the 30s. Highs from the middle 40s to lower 50s.
THURSDAY: Partly cloudy. Chance of a late-day rain shower. Lows from the middle 30s to lower 40s. Highs from the middle 50s to lower 60s.

DAYS 6-10 (APRIL 13-17)
Much of this segment unchanged from yesterday’s update…
This period of time is fairly difficult to figure out weather-wise not only given that spring has so many influencing factors in place with a cold Canada, a chilly ocean, and a building warm air mass not all that far to the south of New England. In addition, the boundary of that Canadian cold and southern US warmth will never be all that far away. Right now expecting a shot of cooler air and a breezy but dry day on April 13. High pressure should bring fair weather April 14 but with it centered in eastern Canada and not off the US East Coast that is a recipe for a chilly coastline and milder air in the interior, but not the potentially very warm shot of air that once looked possible. Sometime during the period of April 15-17 a trough will move through from the west but it may be rapidly weakening as it does so, pushing just a frontal boundary through with a passing brief period of precipitation but temperature averaging near to slightly below normal. If this system is a little further south and/or a little stronger it may bring a more significant precipitation event. Still plenty of time to fine-tune this period of time especially as April 16 is Patriots Day / Marathon Monday. Will refine this a little more for next update.

DAYS 11-15 (APRIL 18-22)
The current indications continue to show a mostly progressive pattern of passing systems with a couple periods of unsettled weather, and temperatures averaging near to mostly below normal for this period.

8:59AM

DAYS 1-5 (APRIL 7-11)
A frontal boundary will sit just southeast of the region this weekend, drifting slowly to the southeast with time. Some leftover moisture riding up behind the nearly stationary front today will produce some light precipitation in parts of the region through late morning. The southeastward drift of this front will result in a wave of low pressure moving along it to pass far enough south of the region to keep just about its entire precipitation shield offshore as it goes by, clipping only Nantucket and possibly outer Cape Cod with some light rain/snow early Sunday. A trough of low pressure will move through Sunday evening and may produce a snow shower in a few locations. A sliver of high pressure will bring fair weather Monday before the next threat of unsettled weather Tuesday. However, with this system we’ll avoid a larger storm resulting because 2 main pieces of energy will not phase – the southern system passing harmlessly out to see while a weaker northern disturbance brings patchy light precipitation, followed by a push of drier air by Wednesday. Forecast details…
TODAY: Mostly cloudy through more sun possible north and west of Boston later in the day. Areas of very light to light rain/snow until late morning. Highs 41-48. Wind W up to 10 MPH.
TONIGHT: Partly to mostly cloudy. Lows 30-37. Wind NW up to 10 MPH.
SUNDAY: Mostly to partly cloudy. Chance of snow/mix/rain Nantucket and possibly outer Cape Cod in the morning. Highs 38-45. Wind N 5-15 MPH.
SUNDAY NIGHT: Variably cloudy with a passing snow shower possible evening. Clearing overnight. Lows 25-33. Wind N 5-15 MPH, higher gusts.
MONDAY: Sunny. Highs 42-49. Wind NW 5-15 MPH.
TUESDAY: Mostly cloudy. Scattered areas of light rain/mix/snow possible. Lows in the 30s. Highs in the 40s.
WEDNESDAY: Partly cloudy. Lows in the 30s. Highs from the middle 40s to lower 50s.

DAYS 6-10 (APRIL 12-16)
This period of time is fairly difficult to figure out weather-wise not only given that spring has so many influencing factors in place with a cold Canada, a chilly ocean, and a building warm air mass not all that far to the south of New England. In addition, the boundary of that Canadian cold and southern US warmth will never be all that far away. My best guess for now is for a quick push of warmer air and possibly a rain shower on April 12 on the milder side of the boundary, then a shot of cooler air and a breezy but dry day on April 13. High pressure should bring fair weather April 14 but with it centered in eastern Canada and not off the US East Coast that is a recipe for a chilly coastline and milder air in the interior, but not the potentially very warm shot of air that once looked possible. Sometime during the period of April 15-16 a trough will move through from the west but it may be rapidly weakening as it does so, pushing just a frontal boundary through with a passing brief period of precipitation but temperature averaging near to slightly below normal. Plenty of time to fine-tune this period of time especially as April 16 is Patriots Day / Marathon Monday.

DAYS 11-15 (APRIL 17-21)
The current indications are more strongly for a continuation of passing systems with a couple periods of unsettled weather, and temperatures averaging near to mostly below normal through the middle of the month.

7:38AM

DAYS 1-5 (APRIL 6-10)
A weak storm system heads into the region today and its center of low pressure will track down the St. Lawrence Valley this evening. The time-of-arrival will allow the atmosphere to warm enough so snow will be confined mostly to the higher elevations of north central MA and southwestern NH where minor accumulation of up to 2 inches on unpaved surfaces may occur, with rain/snow mix elsewhere Boston north and west with no accumulation, and just rain to the south. The cold front trailing from this system will be slow to get offshore but not close enough for anything more than a touch of rain/mix southeastern areas early Saturday, and a wave of low pressure moving along it will stay far enough offshore to keep the region dry Sunday. This has been the system of concern being watched for several days. But we’re not quite done with the active pattern yet and another low pressure system is likely to bring rain/mix/snow to the region by Tuesday. Forecast details…
TODAY: Increasing clouds this morning. Cloudy with snow/mix northwest, mix/rain southeast this afternoon. Highs 35-42. Wind light S to SW.
TONIGHT: Cloudy. Chance of rain, mix far northwest, early. Patchy fog. Temperatures steady 35-42. Wind light SW.
SATURDAY: Cloudy morning with a bit of light rain/mix possible mainly southeastern areas. Becoming partly cloudy by late in the day. Highs 43-49. Wind light SW to W.
SATURDAY NIGHT: Partly cloudy. Lows 28-35. Wind light W to NW.
SUNDAY: Partly sunny. Highs 40-47. Wind N up to 10 MPH.
MONDAY: Partly sunny. Lows from the upper 20s to lower 30s. Highs from the upper 30s to middle 40s.
TUESDAY: Cloudy. Rain/mix/snow likely. Lows from the lower to middle 30s. Highs from the middle 30s to lower 40s.

DAYS 6-10 (APRIL 11-15)
An overall drier stretch of weather is expected but the jury’s out on temperatures. A significant warm-up is possible April 13-15 but we’ll have to watch a frontal boundary to the north, typical of spring, that could make it much cooler, and the speed of a front from the west later in the period that would bring a cooler airmass from Canada via the Great Lakes.

DAYS 11-15 (APRIL 16-20)
Fairly progressive but slightly more active pattern is possible during this time.

7:07AM

DAYS 1-5 (APRIL 5-9)
Bright and blustery today as the rush of chilly air continues in from Canada via the Great Lakes. At least the sun will be unlimited for the Red Sox home opener at Fenway Park. Those in the sun and sheltered from the wind will find it rather pleasant, but if you are in a part of the park with shade and exposed to the wind, you’ll feel rather chilled. Wind will also have an impact on fly balls as it crosses the field from the third base side to the first base side. Our fast-flowing weather pattern will continue and this will bring 2 precipitation threats, one on Friday as a small low pressure area moves through from west to east, and on Saturday a low pressure ripples up the front trailing from the first low. With some cold air in place, there is the opportunity for some snow for portions of the region with both events, though neither will be significant and the second one may miss entirely. Dry weather is expected for Sunday and Monday.
TODAY: Sunny. Highs 42-48. Wind W 15-25 MPH gusting 30-45 MPH.
TONIGHT: Increasing clouds. Lows 25-32. Wind NW 5-15 MPH, diminishing.
FRIDAY: Cloudy with a period of precipitation from mid morning to late afternoon, snow north and west of Boston, rain southeastern MA and southern RI, and mix in between. Minor accumulation of a coating to 1 inch on unpaved surfaces mainly north and west of Boston. Highs 35-42. Wind light variable.
SATURDAY: Cloudy. A period of snow/mix possible, favoring southern areas. Lows from the upper 20s to lower 30s. Highs from the upper 30s to lower 40s.
SUNDAY: Partly cloudy. Lows from the lower to middle 30s. Highs from the lower to middle 40s.
MONDAY: Mostly sunny. Lows from the lower to middle 30s. Highs from the middle to upper 40s.

DAYS 6-10 (APRIL 10-14)
A storm is possible on April 10 possibly to early April 11 with rain/mix/snow. Fair weather follows and there is the possibility of a significant warm-up away from ocean-influenced coastal areas later in the period.

DAYS 11-15 (APRIL 15-19)
A quick cool-down may come to start the period followed by a low pressure system bringing some unsettled weather into mid period before drier weather returns.

7:22AM

DAYS 1-5 (APRIL 4-8)
A brief push of warm air followed by a strong cold front brings a rain showery day today with gusty winds, and drier/colder air with strong winds tonight. A cool gusty wind under bright sun Thursday. Fast-moving pattern brings the next low pressure into the region Friday with cold enough air for a period of snow, ending as rain. Drier air attempts to move in this weekend but another wave of low pressure threatens the region with snow/mix late Saturday to early Sunday. Forecast details…
TODAY: Mainly cloudy. Areas of fog, some dense, during the morning. Scattered rain showers and thunderstorms, a few of which will produce downpours. Highs 48-56 South Coast, 57-64 elsewhere. Wind light variable early, then SW increasing to 10-20 MPH but gusts 25-35 MPH.
TONIGHT: Partly cloudy. Isolated rain showers early. Lows 28-35. Wind W 15-30 MPH with gusts 45-55 MPH.
THURSDAY: Mostly sunny. Highs 42-48. Wind WNW 15-25 MPH with higher gusts.
THURSDAY NIGHT: Increasing clouds. Lows 25-32. Wind NW 5-15 MPH, diminishing.
FRIDAY: Cloudy with snow of a coating to 2 inches, possibly up to 3 inches higher elevations north central MA and southwestern NH, mainly on unpaved surfaces, changing to rain before tapering off. Highs 35-42. Wind light variable.
SATURDAY: Variably cloudy. Chance of mix/snow at night. Lows from the upper 20s to lower 30s. Highs from the upper 30s to lower 40s.
SUNDAY: Variably cloudy. Chance of mix/snow early. Lows from the lower to middle 30s. Highs in the 40s.

DAYS 6-10 (APRIL 9-13)
Active pattern continues with a brief break April 9 then another storm threat, rain favored over mix/snow, April 10-11. The end of the period may see a warm-up but this is always an iffy proposition in southeastern New England at this time of year. Will continue to monitor.

DAYS 11-15 (APRIL 14-18)
Brief warm-up possible to start the period then cooling back down to more seasonable levels. Will watch the risk for a wet weather event during the second half of the period.

6:01AM

DAYS 1-5 (APRIL 3-7)
Warm front approaches today but may struggle to move through this evening as little waves of low pressure form on it. This front will cause wet weather in the form of rain, though it may start as some sleet interior areas. The warm air finally wins out for a few hours Wednesday but a cold front charging eastward will bring a band of showers and a slight chance of thunderstorms eastward across the region during the afternoon, returning cold air to the region after it passes Wednesday night and Thursday, which will be a bright but blustery day for the Red Sox home opener at Fenway Park. The next system comes along quickly on Friday with a period of mix/rain during the day and a surge of cold air producing a risk of snow showers at night. At the moment we should be between systems Saturday with some clouds and a chill.
TODAY: Thickening overcast. Areas of rain arriving, may start as brief snow and/or sleet especially interior areas. Highs 38-45 occurring late day. Wind light SE.
TONIGHT: Cloudy. Areas of fog. Rain likely in the evening. Chance of drizzle overnight. Temperatures steady 38-45. Wind light E.
WEDNESDAY: Mostly cloudy. Areas of fog/drizzle early. Rain showers and a risk of a thunderstorm west to east afternoon. Highs 48-55 South Coast, 56-63 elsewhere. Wind light variable early, then SW increasing to 10-20 MPH except 20-30 MPH Cape Cod with higher gusts, shifting to W from west to east last day and evening.
THURSDAY: Mostly sunny. Highs 43-49. Wind WNW 15-25 MPH with higher gusts.
FRIDAY: Mostly cloudy. Chance of light rain/mix day. Chance of rain/snow showers evening. Breezy. Lows in the 30s. Highs in the 40s.
SATURDAY: Variably cloudy. Lows in the 30s. Highs in the 40s.

DAYS 6-10 (APRIL 8-12)
Wave of low pressure may produce snow/mix April 8 and a second wave may produce rain/mix April 10. Dry weather later in the period. Temperatures continue to run below normal.

DAYS 11-15 (APRIL 13-17)
A shift of upper level features should put high pressure offshore and allow a warm up, possibly significant, at least for the first half of the period before it cools down later in the period.