Today: Hi 35 °F
Tonight: Lo 25 °F
Dew Point: 11.8°F
Barometer: 29.79 in S
Snow Today: Trace
Snow Wednesday: 0.0 in
January: 2.5 in
Winter: 18.6 in
Depth: 0.0 in
Visibility: 10 miles
Avg: 1 mph
Gusts: 4 mph
National Weather Service Boston / Norton, MA
Point Forecast Updated Thu Jan 21, 2021 6:07am EST
Hi 35 °F
Partly sunny, with a high near 35. Southwest wind 2 to 8 mph, with gusts as high as 21 mph.
Lo 25 °F
Partly cloudy, with a low around 25. Southwest wind around 5 mph.
Hi 41 °F
Mostly sunny, with a high near 41. West wind 5 to 8 mph.
Lo 23 °F
Partly cloudy, with a low around 23. West wind 8 to 12 mph.
Hi 29 °F
Sunny, with a high near 29. Northwest wind 12 to 17 mph, with gusts as high as 29 mph.
Lo 15 °F
Clear, with a low around 15. Northwest wind around 18 mph.
Hi 31 °F
Sunny, with a high near 31. Northwest wind 15 to 18 mph.
Lo 19 °F
Mostly clear, with a low around 19. Northwest wind 8 to 13 mph.
Hi 34 °F
Partly sunny, with a high near 34. Northwest wind around 8 mph.
Chance Light Snow
Lo 22 °F
A chance of snow after 8pm. Mostly cloudy, with a low around 22. North wind around 6 mph. Chance of precipitation is 30%.
Chance Light Snow
Hi 33 °F
A chance of snow before 1pm. Partly sunny, with a high near 33. North wind 6 to 9 mph. Chance of precipitation is 30%.
Lo 20 °F
Partly cloudy, with a low around 20. Northwest wind around 9 mph.
Hi 34 °F
Sunny, with a high near 34. Northwest wind around 12 mph.
Lo 20 °F
Mostly clear, with a low around 20. Northwest wind around 9 mph.
National Weather Service Boston / Norton, MA
Updated Thu Jan 21, 2021 6:07am EST
000 FXUS61 KBOX 211118 AFDBOX Area Forecast Discussion National Weather Service Boston/Norton MA 618 AM EST Thu Jan 21 2021 .SYNOPSIS... An upper level disturbance moves off to the east this evening, followed by colder air tonight and Thursday. Mainly dry Thursday night into Friday as a clipper low passes to our north. A strong cold frontal passage Friday night ushers in much colder air and blustery conditions for the weekend. Low pressure in the Ohio Valley will likely redevelop off the mid- Atlantic coast early next week. It remains uncertain if this system may affect our area, and will depend on a favorable storm track. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... 615 AM Update: Overall no significant chagnes needed to the going forecast; did opt to slow arriving cloud cover back by a couple hrs but expectation of increasing clouds by late morning looks on track. Current temps are colder than we've seen recently but still are seasonable in the teens to the mid 20s. At least some diurnal warming and winds becoming SW should boost temperatures up to highs in the mid to upper 30s, near 40. Previous discussion: Our region will be on the southern periphery of a low pressure moving across southeast Canada today. The warm front of this low pressure should move to our north later this morning, will the cold front of this system approaching from the west late today. A mid level cold pool is expected to remain to our north as well, indicating meager lift across southern New England. The limiting factor for precipitation is moisture, which will be limited. Thinking most of our region will remain dry but cloudy, with the exception being the higher terrain of western MA. Even there any snow accumulations should be light, generally an inch or less. Expecting near to slightly above normal temperatures with southwest winds developing behind a warm front. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/... The weak cold front associated with a low pressure across southeast Canada should move through this evening. This will mean clearing skies with colder air tonight into Friday. The presence of the low pressure and mid level cold pool to our north may keep some lingering clouds north of the Mass Pike. Winds turn westerly tonight, and become gusty Friday. Mainly dry conditions with temperatures trending above normal once more. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... Highlights... * Blustery and much colder Sat and Sunday. Sub-zero wind chills possible Sat nite in the interior, with below-normal temps. Low prob of Wind Advisory-level northerly gusts Sat nite/Sunday eastern MA/Cape. * Montoring a low pressure near the mid-Atlantic region later Mon that may affect our area late Mon night/Tues. A suppressed solution is becoming more favored but can't rule out a wintry impact as yet. * Near to below normal temps through the period, coldest temperatures this weekend. Details: Friday Night: A weak Clipper low passes into the northern Gulf of Maine early Friday night. The main story for our area, however, is the passage of a strong but dry cold front. This feature ushers in a strong shot of colder air for especially the second half of the Fri night timeframe (continuing into Sat). By daybreak, 925 mb temps should fall to around -9 to -14C. North to northwest winds will also be increasing to around 15 mph with gusts around 20-25 mph. Will start to see wind chills in the single digits to low teens across interior MA and the higher terrain (Berkshires/Worcester Hills) and into the mid-teens for the rest of Southern New England. Low temperatures mid teens to low 20s, but as mentioned the wind will make it feel colder than that. The Weekend: A blustery/windy and rather cold weekend remains in the offing for Southern New England for Sat into Sunday. High pressure to our west combined with low pressure over the Maritimes will support a fairly robust northerly pressure gradient, and steep lower-level lapse rates owing to the cold advection aloft will facilitate good momentum transport for breezy to at times gusty conditions. Coldest period looks to again be on Sat, with 925 mb temps continuing to fall to values around -12 to -17C following the ECMWF. Full sunshine should be ineffective at producing much diurnal warming and have shown highs in the upper teens to mid 20s in western/central MA and the terrain, mid to upper 20s for CT into northeast MA, and 30-32F along and southeast of I-95. This will likely be the first day this January that Boston and Providence record their first sub-freezing high temperature in the month. Nearly 3 weeks into the month, it speaks to just how mild January has proven to be. Daytime wind chills around 5 to 10 above in the terrain, and mid teens to around 20F for the remainder of the area. Even colder wind chills are anticipated for Sat night, with sub-zero wind chills looking to be the case for most of western and central MA up into the Merrimack Valley. We do have to watch for wind gusts Sat night that may get close to Wind Advisory levels across eastern MA and Cape Cod. May be more limited-impact were Advisory gusts to materialize, and its primary effect being to drive wind chills down. Low temps mainly in the low-mid teens, a little higher than the colder guidance based on the winds staying up most of the night. On Sunday, 925 mb temps are not as cold as they project to be on Sat, but will still be around -8 to -12C. Generally similar overall conditions to Sat with ineffective sunshine due to the colder air, though air temps should be a few degrees warmer than Sat. It will still be quite blustery, and should produce daytime wind chills around +5 to +10F in the terrain, with mid teens to low 20s wind chills elsewhere. Monday thru Wednesday: Pattern aloft changes to one of more zonally-oriented flow in this period, as opposed to persistent WNW flow from a dominant northern- stream jet regime. We are still keeping close monitoring of trough energy in the southern stream that induces Southern Plains cyclogenesis on Monday. The track of this progged storm system thereafter is still unclear. Ensemble means and individual ensemble members generally support a system passing south of 40N/70W Mon night into Tues. There are a couple of members that still are close enough to SNE to bring some impacts, though a large majority keep the system suppressed to our south favoring a miss or a glancing blow for our southernmost areas. Deterministic guidance has suffered from run-to-run inconsistency, with the 00z GFS now weaker and more suppressed. The ECMWF remains the wettest (e.g. snowiest) solution and would bring at least minor accumulations of snow to areas along/south of the Pike, while the Canadian GEM looks more like the GFS in showing more of a mid-Atlantic region impact. Will maintain the NBM's slight to lower Chance PoP for Mon night into Tues. While we can't discount a greater-impact solution similar to the 00z ECMWF as yet, the general consistency across the GEPS/GEFS/EPS ensemble members in showing a more suppressed outcome may be the preference. Will continue to monitor in subsequent model runs in the coming days. High pressure and modest northerly flow would then govern wx across Southern New England if a more suppressed solution verifies, with temps near to below avg. && .AVIATION /11Z THURSDAY THROUGH MONDAY/... Forecaster Confidence Levels. Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Today...High confidence. Mainly VFR with lowering ceilings. Could see some spotty MVFR- IFR visby -SHSN across the higher terrain but away from the TAFs. WNW to W winds become SW and increase to 7-10 kt with occasional gusts to 18-20 kt. Low prob of LLWS as warm front lifts northward late-AM to early-PM. Tonight and Friday...High confidence. VFR. KBOS TAF...High confidence in TAF. KBDL TAF...High confidence in TAF. Outlook /Friday Night through Monday/... Friday Night: VFR. Windy with local gusts up to 30 kt. Saturday through Sunday: VFR. Windy with gusts up to 35 kt. Sunday Night: VFR. Windy with local gusts up to 35 kt. Monday: Mainly VFR, with local IFR possible. Breezy. Slight chance SN. && .MARINE... A weak ridge of high pressure will move offshore this morning. Winds shifting to SW around daybreak as a warm front crosses the southern waters this morning, and the eastern waters early this afternoon. Winds expected to shift from the west tonight into Friday behind a weak cold front. Rough seas around 5 feet are most likely across the outer southern coastal waters into Friday. Small Craft Advisories continue, especially across the southern coastal waters. It is expected that there will be brief periods where conditions improve to less than thresholds. The advisories were simply continued to avoid having to make frequent changes. Outlook /Friday Night through Monday/... Friday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Local rough seas. Saturday: Low risk for gale force winds with gusts up to 35 kt. Areas of rough seas. Saturday Night through Sunday: Strong winds with gusts up to 35 kt. Rough seas up to 11 ft. Sunday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas. Monday: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of snow. Local visibility 1 to 3 nm. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...Small Craft Advisory until 7 PM EST this evening for ANZ232>234. Small Craft Advisory until 11 PM EST this evening for ANZ235- 237. Small Craft Advisory until 7 PM EST Friday for ANZ254>256. && $$ SYNOPSIS...Belk/Loconto NEAR TERM...Belk/Loconto SHORT TERM...Belk LONG TERM...Loconto AVIATION...Belk/Loconto MARINE...Belk/Loconto
Note: Rain measured automatically by weather station. Rain totals do not necessarily include melted frozen precipitation.
For more accurate, manually measured rain data, see the Local Precip Data page.
7 snow days in January
15 snow days this season
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No alerts/warnings active for Southeast Middlesex County.
Alerts active nearby in: Block Island Sound; Buzzards Bay; Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket; Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island; Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm; Nantucket Sound; Rhode Island Sound; Vineyard Sound