DAYS 1-5 (MAY 11-15)

Upper level low pressure and it’s associated cold pool of air aloft will move across the region through Wednesday resulting in variable cloud patches and diurnal cloud development both days. The best chance of any shower activity will come in the form of a few sprinkles favoring the hills well north and west of Boston this afternoon, near the South Coast from a disturbance passing quickly through the region tonight, and one more lobe of energy with a trough swinging through during Wednesday afternoon. I’d previously thought Wednesday would have less of a chance than today, but that’s going to turn out to be the opposite. Anyway, by Thursday and Friday, a weak area of high pressure will provide fair weather, though by later Friday more cloudiness will be appearing in advance of the next disturbance, an upper level low pressure area which will bring cooler air in aloft and set the stage for pop up showers when we get to Saturday.

TODAY: Partly sunny. A passing very light rain shower possible mainly well north and west of Boston this afternoon. Highs 56-63. Wind NW 10-20 MPH, higher gusts.

TONIGHT: Partly cloudy. Chance of a shower during the evening mainly near the South Coast. Lows 38-45. Wind NW 5-15 MPH, higher gusts.

WEDNESDAY: Variably cloudy. Isolated to scattered afternoon showers. Highs 57-64. Wind NW 10-20 MPH, higher gusts.

WEDNESDAY NIGHT: Decreasing clouds. Lows 40-47. Wind W 5-15 MPH.

THURSDAY: Mostly sunny. Highs 60-67. Wind W 5-15 MPH.

THURSDAY NIGHT: Mostly clear. Lows 42-49. Wind WSW up to 10 MPH.

FRIDAY: Mostly sunny to partly cloudy. Highs 63-70. Wind SW 5-15 MPH.

FRIDAY NIGHT: Partly to mostly cloudy. Lows 47-54. Wind SW 5-15 MPH.

SATURDAY: Partly cloudy. Isolated to scattered afternoon showers. Highs 58-65 coast, 65-72 inland. Wind variable up to 10 MPH with sea breezes.

DAYS 6-10 (MAY 16-20)

Upper level low pressure hanging around May 16 will help trigger some diurnal cloud and scattered shower development. A warm front approaching May 17 brings clouds and eventually some risk of light rain. Brief warm sector potential with a chance of showers/thunderstorms May 18. High pressure moves in to bring fair and slightly cooler weather later in the period. Not a high confidence forecast with quite a bit of uncertainty.

DAYS 11-15 (MAY 21-25)

Leaning dry/seasonable to start and wetter/milder later in the period.

C-19 Chat Post – May 11 2021

DAYS 1-5 (MAY 10-14)

A wave of low pressure brought 90% of its rain to the region from around midnight to sunrise this morning, and the other 10% will be exiting via the eastern coastal areas by mid morning. And that’s it. The rest of the day, clouds will start to break with the arrival of drier air, although complete regional clearing is not expected. Another disturbance has to move through from west to east tonight and may trigger a quick passing rain shower or two. An upper level low pressure area with lots of cold air aloft has to cross the region Tuesday into Wednesday, and will be responsible for the development of diurnal cloudiness each day (clouds that form from the sun’s heating of the ground and the heated moisture in the air rising into colder air above). Some of these clouds may grow enough to produce a few showers Tuesday afternoon, but they should not quite reach that capability on Wednesday. High pressure builds into the region Thursday and Friday with nice weather, though by later Friday a disturbance will be approaching from the west and may already be sending at least some cloud patches into our sky.

TODAY: Cloudy start with rain exiting eastern areas early. Clouds breaking for partial sun by midday and afternoon. Highs 56-63. Wind N to W 5-15 MPH.

TONIGHT: Variably cloudy. A passing rain shower possible. Lows 41-48. Wind SW 5-15 MPH shifting to NW.

TUESDAY: Sunny start, then lots of clouds with a passing rain shower possible. Highs 56-63. Wind NW 10-20 MPH, higher gusts.

TUESDAY NIGHT: Clouds decrease. Lows 38-45. Wind NW 5-15 MPH, higher gusts.

WEDNESDAY: Sunny start, then a cloud/sun mix. Highs 57-64. Wind NW 5-15 MPH, higher gusts.

WEDNESDAY NIGHT: Clearing. Lows 40-47. Wind W 5-15 MPH.

THURSDAY: Mostly sunny. Highs 60-67. Wind W 5-15 MPH.

THURSDAY NIGHT: Mostly clear. Lows 42-49. Wind WSW up to 10 MPH.

FRIDAY: Mostly sunny to partly cloudy. Highs 63-70. Wind SW 5-15 MPH.

DAYS 6-10 (MAY 15-19)

A slow-moving but fairly weak upper level low pressure area will drift across the region from west to east during the May 15-16 weekend, with both days having the risk of isolated to scattered showers, but mostly rain-free and seasonably mild. The early part of next week holds uncertainty. There are still signs of a warm-up, but how extensive it is and how long it lasts is a question any time there is chilly air still nearby, which there will be, in eastern Canada. More to come on that…

DAYS 11-15 (MAY 20-24)

Leaning cooler to start, then moderation, mostly dry, and maybe finally a chance of some rainfall later in the period.

C-19 Chat Post – May 10 2021

DAYS 1-5 (MAY 9-13)

High pressure brings nice weather to southeastern New England for Mother’s Day, and I would like to wish all moms reading the blog today a very happy one! The rain, which has made an appearance many times on this day over the years, will be holding off until later tonight as low pressure makes a run at the region, passing through on Monday morning when the rain will come to an end. We will have a pool of chilly air aloft that has to come across the region between late Monday and sometime Wednesday, so we’ll see some cloudiness at times but minimal chance of any additional rainfall, just maybe a passing shower sometime Tuesday. By Thursday, high pressure is expected to provide pleasant spring weather.

TODAY: Sunshine followed by increasing cloudiness. Highs 58-65. Wind W up to 10 MPH morning, variable up to 10 MPH with coastal sea breezes afternoon.

TONIGHT: Cloudy. Rain arriving west to east. Lows 46-53. Wind SE up to 10 MPH.

MONDAY: Cloudy with rain ending from west to east during the morning. Clouds break for partial sun afternoon. Highs 57-64. Wind variable 5-15 MPH, becoming W during the afternoon.

MONDAY NIGHT: Partly cloudy evening. Clearing overnight. Lows 38-45. Wind W 5-15 MPH shifting to NW.

TUESDAY: Sunny start, then lots of clouds with a passing rain shower possible. Highs 55-62. Wind NW 10-20 MPH, higher gusts.

TUESDAY NIGHT: Clouds decrease. Lows 38-45. Wind NW 5-15 MPH, higher gusts.

WEDNESDAY: Sunny start, then a cloud/sun mix. Highs 57-64. Wind NW 5-15 MPH, higher gusts.

WEDNESDAY NIGHT: Clearing. Lows 40-47. Wind W 5-15 MPH.

THURSDAY: Mostly sunny. Highs 60-67. Wind W 5-15 MPH.

DAYS 6-10 (MAY 14-18)

A fair and mild May 14 before a disturbance from the west brings the chance of a few showers May 15. Generally dry weather, starting seasonable then a warming trend the remainder of the period, though by the end of the period way may see the approach of a cold front with a shower/thunderstorm risk.

DAYS 11-15 (MAY 19-23)

Going with the warm-up scenario later in the 6-10 day period and a cool-down with mostly dry weather May 19-20 followed by a gradual moderation. Still fairly low confidence on the pattern this far in advance.

C-19 Chat Post – May 9 2021

DAYS 1-5 (MAY 8-12)

Low pressure well offshore southeast of New England and an upper level disturbance sliding east southeastward across New England today into this evening will provide lots of clouds but very limited rainfall, amounting only to the few showers that can survive into the region from the west or develop in marginally unstable conditions later today into this evening. High pressure moves in and provides nice weather for Sunday – Mother’s Day, but high cloudiness will be streaming in rather quickly during the afternoon ahead of the next area of low pressure. This low is going to be on the weak side and rather quick-moving, with a shot of light rainfall for Sunday night into Monday morning before it departs oceanward. There will still be some upper level energy and cold air aloft hanging around through Tuesday, so lots of clouds may linger Monday even as drier air moves in. The core of upper level cold will be moving across the region during Tuesday. Lots of clouds are expected that day and any sunshine that does occur will just help initiate more cloud development, and possibly lead to a few pop-up rain showers. This, combined with a gusty northwesterly breeze at the surface will make for a rather chilly feel. This will ease a bit Wednesday but with still some cold air aloft we will see additional fair weather cloud development, though likely less extensive as the day before.

TODAY: Mostly cloudy. Isolated to scattered rain showers, favoring areas west and south of Boston in the afternoon and southern NH through eastern MA and RI by evening. Highs 53-60. Wind NE up to 10 MPH.

TONIGHT: Lots of clouds and a few possible rain showers early, then gradual clearing. Lows 38-45. Wind NW up to 10 MPH.

SUNDAY: Sunshine followed by increasing cloudiness. Highs 58-65. Wind W up to 10 MPH morning, variable up to 10 MPH with coastal sea breezes afternoon.

SUNDAY NIGHT: Cloudy. Rain likely. Lows 46-53. Wind SE up to 10 MPH.

MONDAY: Cloudy with rain ending from west to east during the morning. Clouds break for partial sun afternoon. Highs 57-64. Wind variable 5-15 MPH, becoming W during the afternoon.

MONDAY NIGHT: Partly cloudy evening. Clearing overnight. Lows 38-45. Wind W 5-15 MPH shifting to NW.

TUESDAY: Sunny start, then lots of clouds with a passing rain shower possible. Highs 55-62. Wind NW 10-20 MPH, higher gusts.

TUESDAY NIGHT: Clouds decrease. Lows 38-45. Wind NW 5-15 MPH, higher gusts.

WEDNESDAY: Sunny start, then a cloud/sun mix. Highs 57-64. Wind NW 5-15 MPH, higher gusts.

DAYS 6-10 (MAY 13-17)

An area of high pressure is expected to bring fair weather for the middle of next week. Not biting on current model solutions of a low pressure area bringing rain about May 14, but leaning toward a weaker system bringing a chance of rain showers around May 15. Fair weather and a potential warm-up after that if high pressure is stronger toward the Middle Atlantic region, which may be the case.

DAYS 11-15 (MAY 18-22)

There’s a lot of uncertainty in this forecast. It will depend on whether or not the warm-up occurs in the latter portion of the 6-10 day forecast period. If so, there may be a period of unsettled weather as another cool air mass arrives from Canada by the middle or end of the period. Timing and details will be impossible to figure out this far in advance. Just know that there is the potential for some volatility and a more drastic temperature change than I had previously indicated.

C-19 Chat Post – May 8 2021

DAYS 1-5 (MAY 7-11)

The latest US Drought Monitor release on Thursday indicated that conditions have improved somewhat, and that southeastern New England, while largely running abnormally dry due to a precipitation deficit (year-to-date) of up to a few inches, also has a large portion of eastern and southeastern MA with “normal” conditions at this time. Most of the drought is now confined to areas to the north and west. This is the result of a series of beneficial rain events since April. Will that trend continue? It’s hard to say for sure, but recent trends point to us sliding back into a drier regime. We’ll be in between systems today as low pressure evolves too far offshore for direct impact and an upper level low pressure area hangs back to our west. That upper low will come across the region Saturday with lots of clouds and a few rain showers around, but definitely nothing close to a rainy day. A small area of high pressure will cross the region with nice weather for a good portion of Sunday, but clouds will already be racing in ahead of the next low pressure system, which as very flat and progressive system will move through Sunday night and the first part of Monday, when we have our best chance at a light to borderline moderate rainfall. After this system exist, a dry and cooler air mass arrives during Monday into Tuesday with a northwesterly wind flow. Some cold air aloft may trigger cloud development and possibly a few pop up rain showers on Tuesday.

TODAY: Partly sunny. Highs 57-64. Wind variable to E up to 10 MPH.

TONIGHT: Mostly cloudy. Lows 39-46. Wind E to variable under 10 MPH.

SATURDAY: Mostly cloudy. Chance of rain showers, favoring areas west and south of Boston in the afternoon. Highs 53-60. Wind NE up to 10 MPH.

SATURDAY NIGHT: Gradual clearing. Lows 38-45. Wind NW up to 10 MPH.

SUNDAY: Sunshine followed by increasing cloudiness. Highs 58-65. Wind W up to 10 MPH morning, variable up to 10 MPH with coastal sea breezes afternoon.

SUNDAY NIGHT: Cloudy. Rain likely. Lows 46-53. Wind SE up to 10 MPH.

MONDAY: Cloudy with rain ending from west to east during the morning. Clouds break for sun afternoon. Highs 57-64. Wind variable 5-15 MPH, becoming W during the afternoon.

MONDAY NIGHT: Partly cloudy evening. Clear overnight. Lows 38-45. Wind W 5-15 MPH shifting to NW.

TUESDAY: Sunny start, then lots of clouds with a passing rain shower possible. Highs 55-62. Wind NW 10-20 MPH.

DAYS 6-10 (MAY 12-16)

While model guidance indicates possible rainfall from low pressure passing south of the region May 14-15, this system may end up further south than currently shown by guidance. This should be a mostly dry and cool period for southeastern New England, but will watch to see what that system does.

DAYS 11-15 (MAY 17-21)

For now not making any significant changes to the forecast of continued west-to-east movement, limited rainfall, and near to below normal temperatures, but there are a few signs that the overall movement of systems may start to slow as we go through the period, and if so, the location of features will have implications on the specific weather here. Fancy way of saying there is still plenty of uncertainty in the medium range.

C-19 Chat Post – May 7 2021

DAYS 1-5 (MAY 6-10)

It’s a good thing we’ve had a handful of beneficial rainfall events recently. The trend is now back toward drier weather in the medium to long term. This will show even during the next 5 days when a system that initially looked promising for delivering more beneficial rainfall will fail to do so. After high pressure provides us with the nicest day of the week so far today, low pressure will develop south of New England on Friday, but another disturbance to its west which was forecast by much of the guidance to grab it and help it strengthen into a stronger storm, much closer, and much more rain-producing for here, is not going to do the grab and the low to the south will “get away” to the southeast, only grazing the area with clouds and some east to northeast wind later Friday, while the area that was to the west of it gets pulled southeastward and may clip our region with a few rain showers later Saturday. That is how your “storm” turns out. High pressure builds across the area with fair weather expected Sunday. A faster-moving low pressure area makes a run at the region late Sunday night into Monday with a risk for some rainfall, but that does not look like a strong system.

TODAY: Mostly sunny. Highs 59-66. Wind NW 5-15 MPH, gusts 20-25 MPH.

TONIGHT: Increasing clouds. Lows 43-50. Wind NE up to 10 MPH.

FRIDAY: Variably cloudy. Highs 55-62, coolest coast. Wind E 5-15 MPH.

FRIDAY NIGHT: Mostly cloudy. Chance of rain showers, favoring Cape Cod overnight. Lows 44-51. Wind NE 5-15 MPH.

SATURDAY: Mostly cloudy. Chance of rain showers eastern coastal areas early. Chance of rain showers later in the day mainly west and south of Boston. Highs 55-62. Wind N 10-20 MPH.

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

SUNDAY: Sunny to partly cloudy. Highs 58-65, coolest coast. Wind variable up to 10 MPH with coastal sea breezes.

SUNDAY NIGHT: Clouding up. Chance of rain overnight. Lows 47-54. Wind NE 5-15 MPH.

MONDAY: Cloudy with a chance of rain in the morning. Mostly cloudy to partly sunny with a possible rain shower in the afternoon. Highs 56-63. Wind NE to N 5-15 MPH.

DAYS 6-10 (MAY 11-15)

High pressure should be in control of the weather for most of this period. We’ll have to watch for low pressure to the south again later in the period which may very well stay to the south and miss the region. Temperatures near to below normal.

DAYS 11-15 (MAY 16-20)

No changes to the overall outlook of a generally zonal or west-to-east large scale pattern with minor systems bringing a couple of rain shower threats and variable temperatures averaging near to slightly below normal.

C-19 Chat Post – May 6 2021

DAYS 1-5 (MAY 5-9)

Another low pressure system moving across the Northeast will give us another day of unsettled weather today. A couple more waves of showers are to come through the region before drier air finally works in tonight. High pressure builds in for a nice day Thursday. We’re still watching the evolution of a low pressure system for Friday and Saturday, but as has been the trend on guidance as we’ve gotten closer, this system is going to develop to the south and stay mostly offshore, not merging with another piece of energy to its northwest. We’ll experience more fringe effects from that storm than anything direct, getting into an easterly air flow north of it on Friday, which will then shift to northerly on Saturday. At most, its rainfall area may get into coastal southeastern New England sometime Friday night or Saturday morning. It does look like we’ll get that nice day under an area of high pressure on Sunday, but will keep an eye on that as well as sometimes when one low ends up further offshore the next one sneaks in more quickly. So, optimistic for Sunday, but no guarantees at this point.

TODAY: Mainly cloudy with periodic rain showers and a slight chance of thunderstorms. Areas of drizzle and fog mostly NH Seacoast, eastern MA, and RI this morning. Highs 53-60. Wind NE to variable up to 10 MPH.

TONIGHT: Mostly cloudy with a chance of rain showers during the evening. Clearing overnight. Lows 43-50. Wind W 5-15 MPH.

THURSDAY: Sunny to partly cloudy. Highs 61-68. Wind NW 5-15 MPH becoming variable.

THURSDAY NIGHT: Increasing clouds. Lows 43-50. Wind NE up to 10 MPH.

FRIDAY: Mostly cloudy. Highs 55-62, coolest coast. Wind E 5-15 MPH.

FRIDAY NIGHT: Cloudy. Chance of rain showers, favoring coastal areas. Lows 44-51. Wind NE 5-15 MPH.

SATURDAY: Partly sunny. Chance of rain showers, favoring eastern areas during the morning. Highs 55-62. Wind N 10-20 MPH.

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

SUNDAY: Sunny to partly cloudy. Highs 58-65, coolest coast. Wind variable up to 10 MPH with coastal sea breezes.

DAYS 6-10 (MAY 10-14)

An area of low pressure may clip the region but may largely miss to the south on May 10. Another system may bring some wet weather later in the period but the overall trend is for drier and slightly cooler than average conditions.

DAYS 11-15 (MAY 15-19)

Weak to moderate zonal flow with mean trough in the northeastern US seems the most likely pattern with a couple episodes of showers otherwise mostly dry weather and temperatures near to below normal.

C-19 Chat Post – May 5 2021

DAYS 1-5 (MAY 4-8)

Low pressure moving along a frontal boundary just to the south of New England brought in another round of rainfall overnight, which will exit today. We may see slight improvement in the weather later today in the form of breaks in the clouds as a bit of dry air tries to move in from the north, but the next low pressure is not far behind and will thicken the clouds back up tonight. This low is destined to take a track further north, passing north of the region during Wednesday while a secondary low tries to form near or just south of the region before the entire system pushes offshore at night. This will allow high pressure to build in with nice weather on Thursday after additional unsettled weather during Wednesday. I’ve been eyeing the situation for late week with the potential for impact from yet another storm system. The guidance has been fairly consistent over several runs in trending this system weaker and further southeast – something we have seen a lot of over the last couple months with guidance forecasts of a system as we get closer to it. Most of the time this has worked out and I see no reason to turn my back on it this time. So while I do think we will be somewhat unsettled again Friday, I don’t expect a significant storm system. This low will start to intensify as it pulls away Saturday, which should be a mostly dry but rather blustery and cool spring day as it stands now…

TODAY: Overcast with periods of rain and areas of fog in the morning. Cloudy with areas of drizzle and fog early-mid afternoon. Breaking clouds late afternoon. Highs 48-55. Wind NE 5-15 MPH.

TONIGHT: Mostly cloudy evening. Cloudy with numerous to widespread rain showers and a chance of thunderstorms overnight. Areas of fog overnight. Temperatures steady 48-55. Wind N 5-15 MPH early evening, variable up to 10 MPH late evening, SE 5-15 MPH overnight.

WEDNESDAY: Mainly cloudy with periodic rain showers and a slight chance of thunderstorms through early afternoon. Variably cloudy with an additional passing rain shower possible mid to late afternoon. Highs 58-65, coolest South Coast / Cape Cod. Wind S 10-20 MPH shifting to SW.

WEDNESDAY NIGHT: Clearing. Lows 41-48. Wind SW 5-15 MPH shifting to NW.

THURSDAY: Sunny to partly cloudy. Highs 61-68. Wind NW 5-15 MPH becoming variable.

THURSDAY NIGHT: Increasing clouds. Lows 43-50. Wind NE up to 10 MPH.

FRIDAY: Mostly cloudy. Light rain and areas of drizzle possible, favoring southern areas in the afternoon. Highs 51-58. Wind E 5-15 MPH.

FRIDAY NIGHT: Cloudy. Chance of rain showers. Lows 42-49. Wind NE 5-15 MPH.

SATURDAY: Partly sunny. chance of rain showers. Highs 55-62. Wind N 10-20 MPH.

DAYS 6-10 (MAY 9-13)

A small area of high pressure is expected to bring fair weather during the day May 9 before the next disturbance arrives from the west with additional rounds of unsettled weather May 10-12, before improvement later in the period. Temperatures near to below normal.

DAYS 11-15 (MAY 14-18)

Weak to moderate zonal flow with mean trough in the northeastern US seems the most likely pattern with a couple episodes of showers otherwise mostly dry weather and temperatures near to below normal.