Point Forecast Updated Thu Dec 8, 2022 9:48am EST
High pressure building across eastern Canada will bring dry conditions with a cooling trend through Friday. Onshore winds on Saturday may lead to a few rain showers or nighttime flurries near the coast. Low pressure from the Ohio Valley redevelops south of the coast and may bring a period of accumulating snow to western New England late Sunday into early Monday. Mainly dry and cool weather follows through the middle of next week.
Hi 49 °F ↓
Sunny. High near 49, with temperatures falling to around 42 in the afternoon. Northwest wind around 13 mph.
Lo 27 °F
Mostly clear, with a low around 27. Northwest wind around 10 mph.
Hi 44 °F ↓
Sunny. High near 44, with temperatures falling to around 38 in the afternoon. North wind around 9 mph.
Lo 29 °F
Mostly clear, with a low around 29. North wind around 8 mph.
Hi 36 °F
Partly sunny, with a high near 36. North wind around 10 mph.
Lo 27 °F
Mostly cloudy, with a low around 27. Northeast wind around 8 mph.
Cloudy then Chance Light Snow
Hi 35 °F
A chance of snow after 2pm. Cloudy, with a high near 35. Northeast wind 6 to 9 mph. Chance of precipitation is 30%.
Chance Light Snow
Lo 27 °F
A chance of snow. Mostly cloudy, with a low around 27. Northeast wind around 8 mph. Chance of precipitation is 40%.
Chance Light Snow then Mostly Sunny
Hi 36 °F
A chance of snow before noon. Mostly sunny, with a high near 36. North wind 8 to 12 mph. Chance of precipitation is 30%.
Lo 25 °F
Mostly clear, with a low around 25. North wind around 8 mph.
Hi 38 °F
Sunny, with a high near 38. Northwest wind 6 to 10 mph.
Lo 25 °F
Mostly clear, with a low around 25. Northwest wind 6 to 9 mph.
Slight Chance Light Snow then Slight Chance Light Rain
Hi 39 °F
A slight chance of snow between 7am and noon, then a slight chance of rain. Mostly sunny, with a high near 39. Northwest wind around 8 mph, with gusts as high as 21 mph.
Chance Rain And Snow
Lo 31 °F
A slight chance of snow before midnight, then a chance of rain and snow. Mostly cloudy, with a low around 31. North wind around 6 mph. Chance of precipitation is 30%.
Updated Thu Dec 8, 2022 9:48am EST
000 FXUS61 KBOX 081809 AFDBOX Area Forecast Discussion National Weather Service Boston/Norton MA 109 PM EST Thu Dec 8 2022 .SYNOPSIS... High pressure building across eastern Canada will bring dry conditions with a cooling trend through Friday. Onshore winds on Saturday may lead to a few rain showers or nighttime flurries near the coast. Low pressure from the Ohio Valley redevelops south of the coast and may bring a period of accumulating snow to western New England late Sunday into early Monday. Mainly dry and cool weather follows through the middle of next week. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... 945 AM Update: Though still on the mild side with temps in the 40s to lower 50s to this point, it's a much drier day with dewpoints falling into the 20s to mid 30s through the day. It is fairly breezy outside especially across eastern MA and RI where northwest gusts have been in the 25 to 30 mph range. Good mixing today given cold thermal advection steepening lapse rates but mixed layer winds are progged to decrease by early to mid aftn; that decrease should bring gusts into the 20 to 25 mph range until sundown. Aside from the NW breezes though, it's otherwise a really nice day with only modest rises in temps from current values as cold thermal advection offsets diabatic heating from full sun. Previous discussion: Strong high pres builds across eastern Canada today. Rather dry NW flow with PWATs decreasing below 0.25" will result in plenty of sunshine although some increase in cirrus is expected this afternoon assocd with the upper level jet. Modest cold advection today but low level temps are starting out fairly mild so temps will be above normal with highs ranging through the 40s, except lower 50s near the south coast. It will be breezy at times as shallow but well mixed boundary layer supports 20-30 mph gusts. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/... 6:30 AM Update... Some patchy low ceilings that were lingering across SE MA and Rhode Island have scattered out, giving way to abundant sunshine! Low clouds continue to drape over the high terrain of the Berkshires, but anticipating that these clouds will dissipate too as dry air works its way in today. Breezy NW flow expected today but with seasonably mild conditions, expecting a very pleasant afternoon. Tonight into Friday... Strong high pres across eastern Canada remains the dominant feature through Friday with a persistent north wind. Very dry airmass as PWATs drop to near 0.10", about as dry as it gets. This will ensure clear skies tonight, although some ocean effect clouds are expected to develop over the ocean and may brush the Cape/Islands tonight. Full sunshine Friday with barely a cloud in the sky. Temps tonight are tricky as radiational cooling may be limited somewhat by a steady northerly wind. Expect lows mostly in the 20s, except lower 30s near the immediate coast where winds will be strongest and remain gusty at times. On Fri, highs will recover to near seasonable normals, in the 40s. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... Highlights * Trend towards a mostly dry weekend continues outside of some ocean effect showers and flurries Saturday and Sunday. Minor accumulations of snow across eastern MA possible Saturday night * Another shot for accumulating snow Sunday night, primarily across western MA and CT * Unsettled pattern continues into next workweek Saturday and Sunday... With strong high pressure to our north, to the tune of 1050mb, approaching low pressure from the Ohio River Valley will be suppressed to our south. With high pressure to the north and low pressure to our south, we will be stuck in a prolonged easterly flow pattern. While winds will prevail anywhere form northeast to southeast through the weekend, the easterly component advecting warmer marine air over portions of eastern MA and the Cape will be enough to generate some ocean effect showers Saturday afternoon. Given the dry airmass in place, with PWATs only around 0.3" west of I-95, any advected moisture will be restricted east of Worcester. Not anticipating much if any precipitation across western MA and CT during the period. Showers have the potential to change to flurries and light snow showers overnight Saturday as temperatures fall. The maritime airmass will keep temperatures above freezing along the immediate coast and Cape, but temperatures in the 20s across the interior may allow very, emphasis on very, minor accumulations of snow, less than 0.5" on grassy surfaces, to fall along the I-95 corridor south of Boston. Confidence on accumulating snow is low, with the greatest chance in Norfolk and Bristol counties in MA. Sunday Night and Monday... Guidance has honed in on a better chance for accumulating snow during the late Sunday night and early Monday morning timeframe as low pressure moves tracks from upstate NY to south of Long Island. With high pressure still to our north, anticipating that the brunt of precipitation will be suppressed to our south and west, but an amplifying shortwave behind the low looks to provide enough forcing to generate precipitation. Uncertainty remains in how much snow can be expected, but both deterministic and ensemble ECWMF and GEFS members increase our confidence in the possibility that at least minor accumulations of snowfall will be associated with this system. There are a few factors that look to limit snow amounts and geographic range of accumulating snow. The first limitation will be the lack of moisture in place over the region. While the shortwave/low will bump PWATs up to about 0.5", values will only be about 120% of normal. Secondly, the easterly wind component advecting warmer marine air over our region will still be present, especially across eastern portions of our CWA, which will significantly impact not only surface temps, but the entire thermal profile. Subprime 925mb temps around -2 to -4C will not be enough to overcome above freezing surface temps across eastern MA. However, a colder thermal profile and subfreezing surface temperatures across western MA and CT look to be in place by Sunday evening. Given a supportive thermal profile and slightly higher PWATs, the thought is that the probability of accumulating snow will be greatest across CT and portions of MA west of Worcester. Given the low will track to our SW, anticipating that Hartford County and the downslopes of the Berkshires could see the highest accumulations in our CWA. "Highest" should be used lightly in this circumstance, with GEFS and ECWMF ensemble mean snowfall maxing out around 2" in our CWA, with higher totals restricted to central/upstate NY. The 00Z deterministic GFS again hinted at the potential for greater accumulations, but at this time remains an outlier and given this system is still in the Day4/5 timeframe, we continue to rely heavily on ensemble guidance. GEFS ensemble probs suggest a less than 30% chance for 3"+ of accumulation in our area, with ECWMF ensemble probs falling much lower. Tuesday and Beyond... Unsettled pattern looks to stick with us through the majority of the week. While Tuesday and Wednesday look primarily dry, there is a signal for heavy precipitation event sometime late next week, as PWATs grow to 300% of normal. While details will need to be ironed out, should that system look to impact our area, it will be primarily rain. Trends will be our friend while analyzing systems late in the period. && .AVIATION /18Z THURSDAY THROUGH TUESDAY/... Forecaster Confidence Levels: Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. 18z TAF Update: Rest of the Afternoon (thru 00z Friday): High confidence. VFR, but more SCT-OVC bases around 035-050 in the interior/high terrain. Breezy with NW winds 10-15 kt gusts 20-28 kt, strongest eastern and southeast MA. Gust speeds ease by mid to late aftn with cessation of gusts around/after sundown. Tonight: High confidence, though moderate on ceilings across Cape Cod and the Islands. VFR for most, but ocean effect stratocu develops with VFR/MVFR bases (020-035) for HYA, FMH and ACK. Uncertainty on timing of onset and how pervasive it may be (e.g. it may oscillate between VFR and MVFR bases). NW/NNW winds 8-12 kt for most, but stronger Cape and Islands (12-18 kt with gusts 25-30 kt). Friday: High confidence. Stratocu near Cape and Islands shifts offshore early Fri to VFR all airports. N to NNE winds 8-12 kt for most. Breezy for the Cape and Islands, around 18-22 kt with gusts up to 30 kt. Friday Night: Moderate confidence. VFR for much of the period, but returning stratocu toward early Sat AM could lower ceilings to MVFR levels. NE winds for most around 6-10 kt; strong NE winds 15-20 kt with gusts around 30 kt Cape and Islands. KBOS Terminal...High confidence in TAF. VFR. Decreasing gust speeds thru sundown. KBDL Terminal...High confidence in TAF. VFR. Outlook /Friday Night through Monday/... Friday: VFR. Windy with areas of gusts up to 30 kt. Friday Night: Mainly VFR, with local MVFR possible. Windy with areas of gusts up to 30 kt. Saturday: Mainly VFR, with areas MVFR possible. Breezy. Slight chance RA. Saturday Night: Mainly VFR, with areas MVFR possible. Breezy. Sunday: MVFR/IFR conditions possible. Breezy. Chance RA, chance SN. Sunday Night: MVFR/IFR conditions possible. Breezy. Chance SN. Monday: Mainly VFR, with local IFR possible. Windy with local gusts up to 30 kt. Slight chance RA, slight chance SN. && .MARINE... Forecaster Confidence Levels: Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. 350 PM Update: Overall high confidence. Relatively strong pressure gradient through Fri will result in gusty N/NW winds today veering to N tonight and Fri. Gusts to 25 kt expected through tonight, especially eastern waters, increasing to 30 kt Fri. There is some risk for a brief period of marginal gale force gusts late Fri/Fri evening but confidence not high enough for a gale watch at this time. SCA all waters today, and extended into Fri for eastern waters. Outlook /Friday Night through Monday/... Friday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 11 ft. Friday Night: Strong winds with gusts up to 30 kt. Rough seas up to 12 ft. Slight chance of rain. Saturday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 12 ft. Chance of rain. Saturday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 12 ft. Slight chance of rain. Sunday through Sunday Night: Winds less than 25 kt. Rough seas up to 11 ft. Chance of rain. Monday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 11 ft. Chance of rain. Local visibility 1 to 3 nm. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...Small Craft Advisory until 1 PM EST this afternoon for ANZ230- 233>237. Small Craft Advisory until 7 PM EST Friday for ANZ231-232-250- 251-254>256. && $$ SYNOPSIS...KJC/KS NEAR TERM...KJC/Loconto SHORT TERM...KJC LONG TERM...KS AVIATION...KJC/Loconto/Gaucher MARINE...KJC/Loconto/KS
Zone forecast: https://api.weather.gov/zones/forecast/MAZ014/forecast
Hourly forecast: https://api.weather.gov/gridpoints/BOX/64,92/forecast/hourly
Hourly detail: https://api.weather.gov/gridpoints/BOX/64,92
Point detail: https://api.weather.gov/points/42.4399,-71.2405