DAYS 1-5 (DECEMBER 18-22)

Even though our departed storm is heading into the Canadian Maritimes, it continues to have an impact on the region this morning in the form of extensive cloud cover, and even more of an impact from Plymouth County MA to Cape Cod where ocean-effect snow & freezing drizzle has been ongoing, keeping things on the treacherous side where they already saw a wetter snow with rain followed by a flash freeze with a fluffier snow yesterday. Regionwide, conditions will improve today as drier air moves in and clouds break apart and eventually clear from northwest to southeast. High pressure moves in tonight setting up a strong radiational cooling night over the fresh snow pack, and hangs around to give a nice day on Saturday. The next disturbance from the west arrives Saturday night with clouds and takes the day Sunday to pass through with some rain and snow shower activity, but this will be a minor system with minimal impact. A weak ridge of high pressure brings fair weather for Monday, but an upper trough quickly swinging through the region Monday night and Tuesday will ignite a storm offshore. At this time the guidance has this system just too far offshore to be of an impact, precipitation-wise, but we should watch it carefully, given recent guidance performance in advance of such events. Either way, this system will help drag in more Canadian cold later Tuesday.

TODAY: Cloudy start including periods of light snow and/or freezing drizzle from Plymouth County MA to Cape Cod, gradually ending by about midday. Clearing with sun returning from northwest to southeast midday/afternoon. Highs 26-33. Wind NE-N 5-15 MPH morning shifting to N-NW this afternoon.

TONIGHT: Clear. Lows 3-10 except 10-17 urban centers and coastal areas. Wind NW under 10 MPH.

SATURDAY: Mostly sunny. Highs 30-37. Wind W 5-15 MPH.

SATURDAY NIGHT: Variably cloudy. Lows 20-27. Wind SW up to 10 MPH.

SUNDAY: Mostly cloudy. Periods of light snow/mix/rain. Highs 33-40. Wind variable 5-15 MPH.

SUNDAY NIGHT: Mostly cloudy early, then clearing. Lows 21-28. Wind W 5-15 MPH.

MONDAY: Partly cloudy. Highs 35-42. Wind W 5-15 MPH.

MONDAY NIGHT: Mostly cloudy. Lows 23-30. Wind variable 5-15 MPH.

TUESDAY: Mostly cloudy start with a chance of snow/mix favoring Cape Cod, then cloud/sun mix with a risk of a passing snow shower. Highs 35-42 but temperatures likely falling in the afternoon. Wind N 10-20 MPH, gusty.

DAYS 6-10 (DECEMBER 23-27)

Dry, cold December 23 as high pressure moves in then crosses the area. December 24 & 25 bring the next chance for some unsettled weather with early indications for low pressure tracking northwest of the region bringing a warm front / cold front combo through with some mix/rain with the warm front, a surge of milder air, and then rain showers with the cold front, followed by a sharp temperature drop and perhaps some snow showers. Caveat: I don’t necessarily trust the guidance depiction of this event yet, so changes to this outlook are possible. Dry/seasonable later in the period.

DAYS 11-15 (DECEMBER 28 – JANUARY 1)

One or two precipitation events possible during this period, favoring December 28 & 30. Shot of cold air arrives early period then some moderation follows. Low confidence outlook with much re-analysis needed.

C-19 Chat Post – December 18 2020

DAYS 1-5 (DECEMBER 17-21)

The WHW forecast area continues to be impacted by a winter storm, dumping a good amount of snow on much of the region, with a bit less to the southeast due to wetter snow, and even less on parts of the outer part of Cape Cod and over the Islands due to a change to rain there . The mix/rain areas will see a flip back to snow before the end of the precipitation, and areas that had rain and wetter snow will experience a quick freeze-up when the cold air returns during the midday and afternoon hours today. There is also a drier slot with less or even no snow falling in the Merrimack Valley through parts of central MA. These areas will see additional snowfall though as a heavier band to the north and west rotates back through while weakening. Eventually all of the snow will move out from west to east, ending with accumulation with most areas somewhere in the expected ranges. Tonight comes clearing and mid winter cold, despite it still being autumn. Colder than normal but dry weather will dominate Friday and Saturday. Sunday will see slight temperature moderation but also some cloudiness and the possibility of snow and rain showers as a weak low passes by. Following this should be weak high pressure with a dry, seasonable Monday.

TODAY: Overcast with snow except mix/rain South Coast and Cape Cod for a while before changing to snow by midday from west to east. Total snow accumulation: 1-2 inches lower portion of outer Cape Cod (Chatham) as well as Nantucket and Martha’s Vineyard, 2-4 inches upper portion of outer Cape Cod (Provincetown) as well as Mid Cape, 4-8 inches Cape Cod Canal area as well as South Shore up to about Plymouth and westward to the immediate coast of RI, and 8-14 inches elsewhere. Highs 25-32 north and west of Boston, 33-40 elsewhere with mildest Cape Cod and Islands in the morning, followed by falling temperatures midday and afternoon. Wind E to NE 15-25 MPH with gusts 35-45 MPH southeastern MA and southeastern RI, shifting to NW during the afternoon, and NE to NW 10-20 MPH with gusts 25-35 MPH elsewhere.

TONIGHT: Clearing. Blowing snow likely. Lows 10-18. Wind N to NW 10-20 MPH, higher gusts. Wind chill often below 10.

FRIDAY: Sun and passing clouds. Highs 27-34. Wind NW 10-20 MPH.

FRIDAY NIGHT: Clear. Lows 10-17. Wind NW under 10 MPH.

SATURDAY: Mostly sunny. Highs 30-37. Wind W 5-15 MPH.

SATURDAY NIGHT: Variably cloudy. Lows 20-27. Wind SW up to 10 MPH.

SUNDAY: Mostly cloudy. Chance of light snow/mix/rain Highs 33-40. Wind variable 5-15 MPH.

SUNDAY NIGHT: Mostly cloudy early, then clearing. Lows 21-28. Wind W 5-15 MPH.

MONDAY: Partly cloudy. Highs 35-42. Wind W 5-15 MPH.

DAYS 6-10 (DECEMBER 22-26)

Potential unsettled weather events December 22 and 24-25. Temperatures near to slightly above normal dropping to below normal at the end of the period.

DAYS 11-15 (DECEMBER 27-31)

One or two precipitation events possible during this period. Temperatures start cold then moderate.

C-19 Chat Post – December 17 2020

DAYS 1-5 (DECEMBER 16-20)

A nice cold and tranquil day that starts with sun & high clouds and will end with a slate grey overcast in advance of an approaching low pressure area that will bring us a mid December, or late autumn “winter storm”. Pretty certain now that low pressure will track just southeast of New England Thursday morning and midday, it’s weakening and elongating center passing south of Cape Cod and the Islands, with cold high pressure to the north in eastern Canada. This is a recipe for a decent winter weather event, although the low will actually be on a weakening trend instead of strengthening, like many do. Nevertheless, it will still have plenty of moisture with it and pack enough punch to deliver decent snow to most areas. Coastal flooding will not be a major factor with this event, with just some minor flooding around Thursday’s high tide, favoring east-facing and north-facing shores. Wind will be notable but not ferocious, as you’ll see in the detailed forecast below, but the wind direction will be key for snowfall, which leads me to the most difficult aspects of this forecast – the position and movement of a coastal front and the amount of mixing with and changing to rain takes place. Right now, the best bet is that mixing is a safe bet for the South Coast of RI/MA and up along the South Shore of MA to perhaps the Plymouth area during Thursday morning, and a quicker change to rain is pretty likely for a good portion of Cape Cod and the Islands. The determining factor in how much snow ends up falling in these mix/change areas will be how quickly that coastal frontal boundary moves back to the east as the storm goes by, returning cold air to these locations. These areas along and east of that frontal boundary that see a wetter snow and/or rain will also have a high risk of a flash freeze when that cold air returns. Further northwest, it’s a pretty straightforward situation: lower water content fluffy snow, with the only real complicating factor being potential drying patches or bands where intensity may get much lighter keeping some areas near the low end of the forecast range, or even them under-achieving expectation, so we will have to keep an eye out for that. Snowfall amounts will appear in the detailed forecast following this.. After this system departs, it’s dry and cold for Friday and Saturday with temperatures running below average for mid December. A bit of a moderation follows on Sunday but that’s also when we will be dealing with our next unsettled weather – a weaker system coming in from the west, with some light precipitation, favoring snow but with some mix possible as well.

TODAY: Sun followed by increasing clouds. Highs 27-34 Wind N up to 10 MPH.

TONIGHT: Thickening overcast. Snow arriving late evening and overnight, mixing with or changing to rain Cape Cod & Islands. Lows 18-25 except 25-32 South Coast. Wind N to NE 5-15 MPH.

THURSDAY: Overcast with snow except mix/rain South Coast and Cape Cod for a while before changing to snow during the afternoon west to east. Expected snow accumulation: 1-2 inches lower portion of outer Cape Cod (Chatham) as well as Nantucket and Martha’s Vineyard, 2-4 inches upper portion of outer Cape Cod (Provincetown) as well as Mid Cape, 4-8 inches Cape Cod Canal area as well as South Shore up to about Plymouth and westward to the immediate coast of RI, and 8-14 inches elsewhere. Highs 20-27 except 28-35 South Coast and 36-43 outer Cape Cod and Islands. Wind E to NE 15-25 MPH with gusts 35-45 MPH southeastern MA and southeastern RI, shifting to NW during the afternoon, and NE to NW 10-20 MPH with gusts 25-35 MPH elsewhere.

THURSDAY NIGHT: Clearing. Blowing snow likely. Lows 10-18. Wind N to NW 10-20 MPH, higher gusts. Wind chill often below 10.

FRIDAY: Sun and passing clouds. Highs 27-34. Wind NW 10-20 MPH.

FRIDAY NIGHT: Clear. Lows 10-17. Wind NW under 10 MPH.

SATURDAY: Mostly sunny. Highs 30-37. Wind W 5-15 MPH.

SATURDAY NIGHT: Variably cloudy. Lows 20-27. Wind SW up to 10 MPH.

SUNDAY: Mostly cloudy. Chance of light snow/mix. Highs 33-40. Wind variable 5-15 MPH.

DAYS 6-10 (DECEMBER 21-25)

Potential unsettled weather events December 22 and 24-25. Temperatures variable, averaging near normal. Will re-evaluate these events next update.

DAYS 11-15 (DECEMBER 26-30)

One or two precipitation events possible during this period. Temperatures variable, averaging close to normal.

C-19 Chat Post – December 16 2020

DAYS 1-5 (DECEMBER 15-19)

High pressure centered over the Great Lakes delivers a nice shot of cold air today and sets us up for our next storm threat which will bring widespread snow to the region late Wednesday night through most of Thursday. This will evolve as low pressure travels from Texas through the lower Mississippi Valley toward the Tennessee Valley, redeveloping off the Mid Atlantic Coast, then moves just south of New England while heading northeastward on Thursday. With a very cold air mass in place, most of the area will see a low water content, fluff-factor snowfall, the exception being Cape Cod and the Islands where it will be a little milder on the other side of a coastal front that forms and the snow will be a little more sticky there. Minor to moderate coastal flooding is likely near the times of high tide, especially on east-facing and north-facing shores. This system exits Thursday night and high pressure builds back in with dry and cold weather for the end of the week.

TODAY: Sunny. Highs 29-36. Wind NW 10-15 MPH, gusts 20-25 MPH.

TONIGHT: Mostly clear. Lows 17-24. Wind N under 10 MPH.

WEDNESDAY: Sun followed by increasing clouds. Highs 27-34 Wind N up to 10 MPH.

WEDNESDAY NIGHT: Thickening overcast. Snow arriving late evening and overnight. Lows 18-25. Wind N to NE 5-15 MPH.

THURSDAY: Overcast with snow likely, ending west to east late in the day. Snow accumulation 3-6 inches southern NH with a few amounts above 6 inches possible near the NH Seacoast, 6-12 inches elsewhere with a few amounts above 12 inches possible south and southwest of Boston. Highs 18-25 except 25-32 Cape Cod. Wind NE to N 10-20 MPH with gusts up to 30 MPH interior areas, 15-25 MPH with gusts over 40 MPH over southeastern MA especially Cape Cod.

THURSDAY NIGHT: Clearing. Blowing snow likely. Lows 10-18. Wind N to NW 10-20 MPH, higher gusts. Wind chill often below 10.

FRIDAY: Sun and passing clouds. Highs 27-34. Wind NW 10-20 MPH.

FRIDAY NIGHT: Clear. Lows 10-17. Wind NW under 10 MPH.

SATURDAY: Mostly sunny. Highs 30-37. Wind W 5-15 MPH.

DAYS 6-10 (DECEMBER 20-24)

Potential unsettled weather events December 20, 22, and 24. Temperatures variable, averaging near normal. Will re-evaluate this for the next update.

DAYS 11-15 (DECEMBER 25-29)

One or two precipitation events possible during this period. Temperatures variable, averaging close to normal.

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C-19 Chat Post – December 15 2020

DAYS 1-5 (DECEMBER 14-18)

Firstly, I don’t want to neglect to mention that today is a new moon, and the tides are astronomically high, and some minor coastal flooding is likely to occur near high tide times especially along east and north facing shores… For some time we’ve been anticipating a middle of December stretch of active weather that features some wintry weather opportunities, and 2 such opportunities are now pretty certain, one today and another at midweek. First today’s, which will be a minor event as a wave of low pressure approaches from the southwest and passes just south of New England by this evening. This will be occurring as cold air filters into the region, so with temperatures marginal for rain vs. snow, and on the milder side of the line in many areas, this event will likely start as rain or a mix of rain and snow for many areas later this morning. During the afternoon is when colder air will filter in from the north and some will be brought down from above adequately enough to flip the precipitation over to mostly snowfall, which will then exit from west to east by early evening as this progressive system exits the region. It will leave behind a minor snow accumulation, favoring areas near and south of I-90, but a burst of moderate snow can leave untreated roads slick for a while, and as temperatures fall tonight behind the system, any untreated wet surfaces will become icy. That cold air will be delivered with a little more force on Tuesday as what was our minor low pressure wave intensifies into quite the storm as it passes through the Canadian Maritime Provinces and creates a healthy northerly air flow out of eastern Canada between itself and high pressure north of the Great Lakes. While Tuesday will be a day with plenty of low angle December sun, it will be a cold one, and helps to set the stage for our next storm system. This low pressure area starts out as a rather innocuous looking system in Texas Tuesday, but travels steadily eastward through the lower Mississippi Valley, picking up moisture from the Gulf of Mexico, then heading northeastward toward the Tennessee and Ohio Valleys. A warm front extending eastward from this initial low will be the focal point for the development of a new low pressure area near the Carolina Coastline through Wednesday, which will then travel northeastward, passing southeast of New England Thursday. All the while, high pressure will sit over eastern Canada, supplying plenty of cold air. At this point, there are still some notable model guidance differences in how much snow will fall, but they are in general agreement that the odds favor the heaviest snowfall being in the southern half of Massachusetts southward. With the amount of cold air expected to be around and the track of low pressure offshore, this should be a straight snow event for pretty much the entire region, with the only possibility of mixing being on the outer part of Cape Cod and Nantucket, just due to the ocean water temperature still on the mild side. Going to hold off on putting snowfall numbers on this system until tomorrow morning’s update, but just know that an event requiring at least some snow removal is rather likely. As it departs and the sky clears Thursday night, we’re set up for a very cold night and a cold/dry Friday.

TODAY: Cloudy. Rain/mix arriving west to east by late morning and midday, transitioning to mix/snow through mid afternoon before ending by evening. Snow accumulation of a coating to 1 inch especially near and south of I-90, with an isolated 2 inch amount possible. Highs 33-40. Wind N 5-15 MPH.

TONIGHT: Clearing. Lows 21-28. Wind NW 5-15 MPH.

TUESDAY: Mostly sunny. Highs 31-38. Wind NW 10-15 MPH, gusts 20-25 MPH.

TUESDAY NIGHT: Mostly clear. Lows 17-24. Wind N under 10 MPH.

WEDNESDAY: Sun followed by increasing clouds. Highs 28-35 Wind N up to 10 MPH.

WEDNESDAY NIGHT: Thickening overcast. Snow arriving late evening and overnight. Lows 18-25. Wind N to NE 5-15 MPH.

THURSDAY: Overcast with snow (possible mix outer Cape Cod & Nantucket), ending late. Significant snow accumulation possible in southern NH and northern MA and probable southern MA southward. Highs 23-30. Wind NE to N 10-20 MPH, higher gusts possible.

THURSDAY NIGHT: Clearing. Blowing snow possible. Lows 10-18. Wind N to NW 10-20 MPH. Wind chill below 10.

FRIDAY: Sun and passing clouds. Highs 27-34. Wind NW 10-20 MPH.

DAYS 6-10 (DECEMBER 19-23)

Dry, cold weather expected behind storm with Canadian high pressure December 19. Next unsettled weather threat comes later on December 20 with rain/mix/snow possible, followed by a return to dry weather December 21 with a shot of seasonably chilly air. Have to watch for a minor system with snow/mix possible toward the end of this period.

DAYS 11-15 (DECEMBER 24-28)

Active pattern may continue with at least one and possible two precipitation threats to be fine-tuned as we get closer. Variable temperatures, averaging close to normal overall.

C-19 Chat Post – December 14 2020

DAYS 1-5 (DECEMBER 13-17)

A temperature / dew point match and calm wind means that many wake up to a dense fog this morning, except portions of the South Coast where the temperatures are a little higher and there are only patchy areas of fog. Those areas are in the warm sector, while areas with the more widespread fog in place remained in the cooler air – i.e., the warm front never got through there. A frontal boundary from the west pushes through the region this morning and introduces a drier air mass to the region, which will be evident as fog dissipates and the wind picks up from the west during the day. But this air mass is not really that cold at all so it will be a nice day, temperature-wise. For areas in the cool air still, we call this frontal passage a “warm occlusion”, because the air behind the front from the west is milder than the air that was north of the warm front that did not make it through those areas. South of the warm front, areas that are in the warm sector will have that front pass as a cold front, though the air behind it will be milder as it passes those areas due to time-of-day, diurnal warming. Colder air will gradually filter into the region during tonight and we should have just enough clear sky to at least get a chance to view the peak of the Geminid meteor shower. This meteor shower can produce up to about 60 meteors per hour if you are viewing with clear sky and away from light pollution, so in our area the rate of visible meteors will likely be under that with at least partial cloud cover. The clouds come quickly back in overnight and into Monday while on the frontal boundary just gone by, a wave of low pressure will come rippling along rather quickly to the northeast. This low pressure area will come close enough to bring a period of snow and rain to the region during Monday, although it will be a fairly short-duration event that is not too heavy. It does have the potential to produce some minor accumulation of snow, and based on the track and marginal temperature profile expected, the greatest chance to see this accumulation will be along the I-95 and I-90 areas in general. This system exits Monday evening and a reinforcing cold front slides rather quietly through the region, but its impact will become rather noticeable as the cold air behind it arrives during Tuesday as high pressure to the north brings fair weather. This cold air is going to be around for a while, and plays a role in our next storm threat, currently timed for Wednesday night and Thursday. This will take place as low pressure tracks northeastward from lower Mississippi Valley toward the Ohio Valley, then quickly redevelops near the Mid Atlantic Coast, tracking just south of New England. The precise track of this low pressure area and the precipitation distribution to its north will determine how much snow falls in our area. With this threat at the end of our day 4 and well into our day 5 forecast, it’s far too soon to discuss specific snowfall amounts, but not too soon to say the system has the potential to produce a significant snowfall for at least a portion of the region. As always, this will be fine-tuned through the meteorological process as we get closer to the event, and you can see my thoughts in the daily comments section and of course each morning update.

TODAY: Widespread fog especially Boston area west and north to start, gradually dissipating toward midday. Mostly cloudy to partly sunny. Highs 55-62. Wind SW to W increasing to 5-15 MPH, gusts up to 25 MPH.

TONIGHT: Partly cloudy. Lows 28-35. Wind NW 5-15 MPH.

MONDAY: Mostly cloudy. A period of snow/mix/rain, but favoring snow with accumulations of a coating to 2 inches. Highs 32-39. Wind N to NW 5-15 MPH.

MONDAY NIGHT: Clearing. Lows 20-27. Wind NW 5-15 MPH.

TUESDAY: Mostly sunny. Highs 30-37. Wind N 5-15 MPH.

TUESDAY NIGHT: Mostly clear. Lows 17-24. Wind N under 10 MPH.

WEDNESDAY: Sun followed by increasing clouds. Highs 28-35 Wind N up to 10 MPH.

WEDNESDAY NIGHT: Thickening overcast. Snow arriving. Lows 18-25. Wind N to NE 5-15 MPH.

THURSDAY: Overcast with snow, ending late. Significant snow accumulation possible. Highs 23-30. Wind NE to N 10-20 MPH, higher gusts possible.

DAYS 6-10 (DECEMBER 18-22)

Dry, cold weather expected behind storm with Canadian high pressure December 18-19. Next unsettled weather threat comes later on December 20 with rain/mix/snow possible, followed by a return to dry weather December 21-22 and a shot of seasonably chilly air.

DAYS 11-15 (DECEMBER 23-27)

Pattern still looks somewhat active, a little milder to start, then colder again. Can’t rule out a couple rain/mix/snow threats which I’ll bring into focus as we get closer to this time period.

C-19 Chat Post – December 13 2020

DAYS 1-5 (DECEMBER 12-16)

We’ve an active weather pattern on our hands and a few other things to talk about too! We start our weekend with the approach of a warm front which will lead to thickening cloud cover after much of the region starts the day with fog. Areas of rain will follow the thickening cloud cover, arriving from southwest to northeast later this morning through the afternoon hours. While it won’t likely rain the entire time, a few of the episodes may be moderate. The low pressure area parenting this warm front will track northwest of New England tonight and north of the region Sunday. The warm front will probably not get through the entire area, with northern MA and southern NH staying coolest through Saturday night. The cold front trailing this low pressure area will cross the region during Sunday morning (as a warm occlusion in areas that the warm front has not passed). This front may produce a few rain showers, but the balance of the day is expected to be rain-free and rather mild by December standards. A secondary cold front will sweep across the region behind the departing low from northwest to southeast Sunday night, delivering a batch of colder air to the region. Let’s hope for some clear sky Sunday evening as we experience the peak evening of the Geminid meteor shower, with up to 60 meteors per hour visible away from city lights. If the sky is clear enough, look into the east northeast sky between 8PM and 11PM for peak activity, radiating out from the left side of the Gemini Constellation. During Monday, a wave of low pressure will be moving rapidly east northeastward and will pass southeast of our area. Model guidance has trended a little further north with this system, and it may indeed have some impact on the region Monday, spreading its precipitation shield at the very least into southeastern portions of the forecast area. Will forecast a minor snow accumulation event for this and make adjustments if necessary on tomorrow morning’s blog update. Temperatures will be marginal for this event and rain will likely be involved as well, at least for parts of the region, if the precipitation shield does indeed make it far enough north. Regardless of the details, behind this system will come colder air as high pressure builds across eastern Canada. We’ll have dry weather Tuesday and at least into Wednesday as we eye the approach of another storm system that threatens the region with snow as early as Wednesday afternoon…

TODAY: Areas of fog. Becoming Thickening overcast. Periods of rain midday on. Highs 40-47 southern NH northern MA, 48-55 to the south. Wind N-NE 5-15 MPH southern NH and northern MA, variable to SE 5-15 MPH elsewhere.

TONIGHT: Overcast with areas of fog and occasional rain in the evening. Mostly cloudy with continued areas of fog and rain showers overnight. Lows 37-44 southern NH and northern MA, 45-52 elsewhere. Wind NE up to 10 MPH in southern NH and northern MA, variable to S 5-15 MPH to the south.

SUNDAY: Mostly cloudy to partly sunny. Chance of rain showers early. Highs 53-60. Wind SW 5-15 MPH, gusts up to 25 MPH.

SUNDAY NIGHT: Partly cloudy. Lows 28-35. Wind NW 5-15 MPH.

MONDAY: Cloudy. Chance of rain and/or snow, favoring southeastern MA, eastern CT, and RI where accumulations of up to a few inches of snow are possible. Highs 35-42. Wind N 5-15 MPH.

MONDAY NIGHT: Clearing. Lows 20-27. Wind NW 5-15 MPH.

TUESDAY: Mostly sunny. Highs 30-37. Wind N 5-15 MPH.

TUESDAY NIGHT: Mostly clear. Lows 17-24. Wind N under 10 MPH.

WEDNESDAY: Increasing clouds. Chance of snow by late day or at night. Highs 28-35. Wind NE 5-15 MPH.

DAYS 6-10 (DECEMBER 17-21)

Potential snow event into December 17, details to be determined by storm track. Dry, cold weather December 18-19. Next threat of precipitation comes later December 20 into December 21.

DAYS 11-15 (DECEMBER 22-26)

Minor precipitation event possible around the middle of the period, otherwise a quieter and seasonable pattern seems likely.

C-19 Chat Post – December 12 2020

DAYS 1-5 (DECEMBER 10-14)

High pressure delivers a nice December day today. The weekend will turn out somewhat unsettled as low pressure cuts across the eastern Great Lakes then down the St. Lawrence Valley, its warm front never really making much progress through the region during Saturday, when some periods of wet weather will occur. Although an partially occluded front / cold front will pass by during Sunday, that day itself may not be all that bad, with limited rain shower activity confined mainly to the early part of the day, and fairly mild air for December. Colder air will filter in early next week. Monday, low pressure passes south of the region and may be close enough to bring some light precipitation at least to southern areas while a low pressure trough may bring a few snow showers to northern locations. Dry weather is expected Tuesday with high pressure extending into the region from eastern Canada.

TODAY: Sun and high clouds. Highs 40-47. Wind SW up to 10 MPH.

FRIDAY NIGHT: Increasing clouds. Lows 30-37. Wind SE under 10 MPH.

SATURDAY: Mostly cloudy. Chance of light rain, mainly in the afternoon. Highs 45-52 except 38-45 in northern MA and southern NH Wind SE up to 10 MPH.

SATURDAY NIGHT: Cloudy. Spotty light rain except possible pockets of freezing rain southern NH and northern MA. Lows 31-38. Winds NE under 10 MPH.

SUNDAY: Variably cloudy. Rain showers likely, mainly during the morning. Highs 46-53. Wind variable 5-15 MPH becoming W.

SUNDAY NIGHT: Variably cloudy. Lows 28-35. Wind W 5-15 MPH.

MONDAY: Mostly cloudy. Chance of light snow/mix/rain favoring South Coast. Chance of passing snow showers southern NH and northern MA. Highs 35-42. Wind variable 5-15 MPH becoming NW 10-20 MPH.

MONDAY NIGHT: Partly cloudy. Chance of snow showers early. Lows 22-29. Wind N 5-15 MPH.

TUESDAY: Mostly sunny. Highs 33-40. Wind N to NE 5-15 MPH.

DAYS 6-10 (DECEMBER 16-20)

Storm threat (rain/mix/snow) December 16-17 with details depending on track of low pressure. Colder/dry December 18-19. Risk of snow and rain showers at the end of the period, slightly milder.

DAYS 11-15 (DECEMBER 21-25)

Watching the period December 21-23 for a potential storm threat. Temperatures variable, close to normal overall.