Point Forecast Updated Mon Jan 25, 2021 2:54pm EST
Lo 13 °F
Partly cloudy, with a low around 13. Northwest wind 1 to 8 mph.
Mostly Cloudy then Chance Light Snow
Hi 33 °F
A chance of snow after 3pm. Mostly cloudy, with a high near 33. Northeast wind around 5 mph. Chance of precipitation is 40%.
Light Snow Likely
Lo 27 °F
Snow likely. Cloudy, with a low around 27. Northeast wind around 5 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.
Chance Light Snow
Hi 36 °F
A chance of snow. Cloudy, with a high near 36. Northeast wind around 6 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.
Chance Light Snow then Chance Snow Showers
Lo 29 °F
A chance of snow before 8pm, then a chance of snow showers. Cloudy, with a low around 29. North wind around 7 mph. Chance of precipitation is 40%. New snow accumulation of around one inch possible.
Chance Snow Showers then Mostly Cloudy
Hi 34 °F
A chance of snow showers before noon. Mostly cloudy, with a high near 34. North wind 8 to 12 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
Lo 12 °F
Partly cloudy, with a low around 12. Northwest wind around 13 mph.
Hi 20 °F
Mostly sunny, with a high near 20. Northwest wind 12 to 15 mph.
Lo 9 °F
Mostly clear, with a low around 9. Northwest wind 9 to 14 mph.
Hi 24 °F
Sunny, with a high near 24. Northwest wind around 10 mph.
Lo 11 °F
Partly cloudy, with a low around 11. Northwest wind 3 to 8 mph.
Chance Snow Showers
Hi 31 °F
A chance of snow showers after 11am. Partly sunny, with a high near 31. Northeast wind around 5 mph. Chance of precipitation is 30%.
Chance Snow Showers
Lo 21 °F
A chance of snow showers. Mostly cloudy, with a low around 21. Northeast wind around 6 mph. Chance of precipitation is 30%.
Chance Snow Showers
Hi 37 °F
A chance of snow showers. Cloudy, with a high near 37. Northeast wind 7 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Updated Mon Jan 25, 2021 9:15pm EST
000 FXUS61 KBOX 252332 AFDBOX Area Forecast Discussion National Weather Service Boston/Norton MA 632 PM EST Mon Jan 25 2021 .SYNOPSIS... Dry and quiet weather tonight as high pressure remains in control. A warm front lifts in and brings minor snow accumulation Tuesday night into Wednesday. This will result in slick travel for parts of the region. Unsettled for midweek with considerable cloudiness and periods of ocean effect precipitation as a powerful low near the mid- Atlantic waters passes well to our south. Period of much below normal temperatures and low wind chills for late in the week, only gradually modifying into the weekend. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... 7 pm Update... Forecast is on track with no changes necessary this evening. Temperatures were adjusted slightly to bring in line with observations, and timing of incoming cloud cover was slower a bit. Temperatures this evening are currently in the upper 20s and will bottom out in the teens overnight. Previous Discussion... Highlights * Dry and quiet weather with increasing cloud cover. Ridge axis builds into the eastern Great Lakes tonight, but will flatten out a bit as a trough lifts into Lower Michigan/Ohio Valley. A surface high will build into the region. Anticipate mid to high clouds to move in as low pressure deepens over the Ohio Valley and warmer air advects in from south. Have nudged down lows to the 15th percentile of guidance as there should be good radiational cooling, but only crux will be how quickly the clouds blanket the region. Lows range from teens across the interior to the 20s along the coastal plain. There will be a few locations across the higher elevation where readings are in the single digits above zero. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY/... Highlights * Winter Weather Advisory for the eastern slopes of the Berkshires and north central CT for light accumulating snowfall late on Tuesday into Wednesday. Snowfall totals of 2-4 inches where the advisory is in effect. Light snow elsewhere with amounts in the 1-3 inch range. * Light snow lingers on Wednesday, but coastal areas will see some rain mixing in. Ridge axis builds offshore on Tuesday while a trough lifts into the eastern Great Lakes. The trough moves into southern New England by late Tuesday night and offshore early on Wednesday. A surface low will lift across the eastern Great Lakes and warmer air overspreads the region. Will see a secondary low develop near the DE/NJ/VA area late on Tuesday and move northeast well to the southeast of southern New England on Wednesday. An inverted trough associated with this low will be present on Wednesday lingering light precip. Dry to start across southern New England on Tuesday and it will likely take a bit for precipitation to begin with a dry airmass in place - dewpoints start out in the teens to single digits on Tuesday. This will gradually moisten as winds shift from the north to the east advecting in marine air. Have tapered back precipitation chances, but don't think things will really get going until the afternoon when the boundary layer is able to moisten up per NAM/GFS BUFKIT soundings. This period of drier air eroding is the best opportunity for any wintry mix, but think this should be short lived and should be isolated to the south coast per model soundings. Did trend the precipitation amounts upward as the 12Z suite of guidance continues to the upward trend. This does tick up snowfall amounts to around 3 inches into central MA. If the upward trend continues will likely need to expand the Winter Weather Advisory further east in future updates. As of right now expect 1-3 inches of snow accumulation outside of the current advisory with amounts closest to 3 inches central and portions of western MA. Lesser amounts are anticipated elsewhere. Should see the heaviest snowfall late on Tuesday into Tuesday night before things wind down overnight into early Wednesday. Issued the Winter Weather Advisory where am most confident in totals falling in the 2-4 inch territory. Luckily for this event it still does not appear that the snow growth region coincides with the best omega. Inverted trough in place associated with the departing secondary low on Wednesday. This will linger light snow showers across much of southern New England on Wednesday, but expect coastal areas to see some rain mixing in. Could potentially see a few spots get an additional half inch of light snow across the interior. Temperatures in the upper 20s to 30s on Tuesday and 30s to low 40s on Wednesday. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... Wednesday Night: Persistent snow showers are likely across southern New England overnight Wednesday as an inverted trough trails across the area. Snow will be focused across southern New England, but may switch to rain across Cape Cod and the islands. Lows Wednesday night will range from the mid 20s in the west to mid 30s across far eastern Massachusetts. Thursday: Snow chances diminish by daybreak Thursday as a high pressure system establishes itself over southern New England. A potent coastal low will track south of the region. Precipitation chances across southern New England are low considering high model consensus that the low will be centered off of the mid-atlantic. While this system will be a miss in terms of precipitation, winds will build from the NNE as the low moves off the coast into the Atlantic. Winds are likely to gust to 30 kts. The NNE wind will be accompanied by a region of enhanced moisture that may generate some ocean effect snow across Cape Cod, the islands, and the South Shore of Massachusetts. There remains a lower probability that these snow showers will expand to the I-95 corridor or even further. High temperatures Thursday will range from the mid to upper 30s. Thursday Night into Friday Night: An area of colder than average air is pulled southward from Hudson Bay as the mid-Atlantic low pushes eastward. This pattern change will result in an extended period of much colder temperatures, as we trend well below average. Lows Thursday night will dip into the single digits and low teens. Gusty northwest winds, 15-20kts, will drop windchills below zero across most localities overnight Thursday. Worcester and points west may experience wind chills as low as -10F, but it is anticipated that values will remain above advisory criteria. Temperatures will struggle to climb into the mid to upper teens on Friday across the west, while eastern locations will climb into the low 20s. Increasing winds Friday, between 20- 30kts, will keep daytime apparent temperatures in the single digits. While winds begin to subside overnight Friday, cold temperatures remain in place. Widespread single digits are expected, except along the coast where temperatures remain in the teens. Saturday through Sunday: With high pressure in place, the cold airmass will begin to loosen its grip on the region on Saturday, but temperatures will still remain about 10 degrees below average. Highs are expected to top out in the mid 20s. Saturday night will see temperatures drop again into the high single digits and low teens, however the subsiding wind will keep apparent temperatures 5-15 degrees above zero. On Sunday, temperatures rebound significantly, as still below average but more seasonable highs are expected, with upper 20s west and mid 30s south and east. The very cold air mass gradually modifies into the weekend, with high pressure remaining in control. This should support mainly dry weather into Sunday, though temperatures will still trend below- average for late January. Sunday Night through Monday: High uncertainty remains about the timing of a potential coastal low Sunday night into Monday. Several models show consensus about the presence of the coastal low, but differ significantly with timing and evolution. The GFS shows that the system will begin push into the region on Sunday, while the European model suggests a much slower progression, with the bulk of precipitation approaching late Monday. As a result, temperatures, and QPF are hard to nail down late in the forecast and will be highly dependent on storm progression. More attention will be paid to this potential system as we approach the weekend. && .AVIATION /00Z TUESDAY THROUGH SATURDAY/... Forecaster Confidence Levels. Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. 00Z Update... Tonight... High confidence VFR with light northwest to north winds. Mid to high clouds continuing to increase. Tuesday...High confidence in trends moderate in timing VFR for at least the first half of the day. Should gradually see MVFR and possibly IFR conditions spreading in late in the afternoon as snow spreads in from W to E. Light north winds shifting to the E. Tuesday night...Moderate confidence MVFR to IFR with localized LIFR. Snow across southern New England, may have some visibility reductions especially during the evening where could be falling moderately into MVFR visibility at times. Expect the intensity to come down after midnight. KBOS TAF...High confidence in TAF. KBDL TAF...High confidence in TAF. Outlook /Wednesday Night through Saturday/... Wednesday: MVFR/IFR conditions possible. Chance SN, chance RA. Wednesday Night: Mainly VFR, with areas IFR possible. Breezy. Chance SHSN. Thursday: Mainly VFR, with local IFR possible. Breezy. Slight chance SHSN. Thursday Night through Friday: VFR. Breezy. && .MARINE... Have continues Small Craft Advisories across the eastern waters into this evening and late tonight. Will continue to see northwest to north winds diminishing as high pressure builds in. Should see waves fall below 5 ft late tonight. Rain and snow spreads in Tuesday and Tuesday night and could bring some visibility reductions. Winds shift from the N to the E on Tuesday. Should see some 15-20 kt gusts across the southern waters late on Tuesday and Tuesday night. Wave heights 2-4 ft. Outlook /Wednesday Night through Saturday/... Wednesday: Winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain. Wednesday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers. Thursday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Chance of rain showers. Thursday Night: Strong winds with local gusts up to 30 kt. Rough seas up to 10 ft. Slight chance of snow showers. Friday: Strong winds with gusts up to 30 kt. Rough seas up to 11 ft. Slight chance of snow showers. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...Winter Weather Advisory from 1 PM Tuesday to 10 AM EST Wednesday for CTZ002. MA...Winter Weather Advisory from 1 PM Tuesday to 10 AM EST Wednesday for MAZ002-008-009. RI...None. MARINE...Small Craft Advisory until 7 PM EST this evening for ANZ231- 251. Small Craft Advisory until 11 PM EST this evening for ANZ250. Small Craft Advisory until 2 AM EST Tuesday for ANZ254. && $$ SYNOPSIS...BL/BW/KS NEAR TERM...BL/BW/KS SHORT TERM...BL LONG TERM...BW/KS AVIATION...BL/BW/KS MARINE...BL/BW/KS
Zone forecast: https://api.weather.gov/zones/forecast/MAZ014/forecast
Hourly forecast: https://api.weather.gov/gridpoints/BOX/64,79/forecast/hourly
Hourly detail: https://api.weather.gov/gridpoints/BOX/64,79
Point detail: https://api.weather.gov/points/42.4399,-71.2405