Light rain, Overcast
This Afternoon: Hi 62 °F ↓
Tonight: Lo 29 °F
Dew Point: 52.5°F
Barometer: 29.70 in S
Snow Today: 0.0 in
Snow Monday: 0.0 in
December: 15.8 in
Winter: 16.0 in
Barometer: 29.70 in S
Rain Rate: 0.00 in/hr
Rain Today: 0.04 in
Rain Monday: 0.85 in
Visibility: 10 miles
Now: 2 mph
Avg: 4 mph
Gusts: 10 mph
National Weather Service Boston / Norton, MA
Point Forecast Updated Tue Dec 10, 2019 6:47am EST
Hi 62 °F ↓
Rain. Cloudy. High near 62, with temperatures falling to around 52 in the afternoon. Southwest wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts less than a tenth of an inch possible.
Light Rain Likely then Light Snow
Lo 29 °F
Rain likely before midnight, then snow and sleet likely and patchy fog. Cloudy, with a low around 29. West wind 6 to 9 mph. Chance of precipitation is 80%. New snow accumulation of around one inch possible.
Hi 33 °F
Snow and patchy fog before 1pm. Mostly cloudy, with a high near 33. West wind around 6 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Lo 21 °F
Partly cloudy, with a low around 21. West wind 5 to 10 mph.
Hi 29 °F
Sunny, with a high near 29. Northwest wind 5 to 9 mph.
Lo 18 °F
Partly cloudy, with a low around 18. Southwest wind around 2 mph.
Slight Chance Light Snow
Hi 39 °F
A slight chance of snow between 10am and 1pm, then a chance of rain. Partly sunny, with a high near 39. Southeast wind 0 to 5 mph. Chance of precipitation is 50%.
Rain And Snow
Lo 35 °F
A chance of rain before 7pm, then rain and snow. Mostly cloudy, with a low around 35. Southeast wind around 7 mph. Chance of precipitation is 80%.
Hi 52 °F
Rain. Cloudy, with a high near 52. South wind around 8 mph. Chance of precipitation is 80%.
Chance Light Rain then Patchy Fog
Lo 38 °F
A chance of rain before 7pm, then a chance of rain and patchy fog between 7pm and midnight, then patchy fog and a slight chance of rain. Mostly cloudy, with a low around 38. Southwest wind around 6 mph. Chance of precipitation is 30%.
Hi 47 °F
Patchy fog and a slight chance of rain showers before 3pm. Mostly cloudy, with a high near 47. West wind 6 to 9 mph.
Lo 30 °F
Partly cloudy, with a low around 30. West wind around 10 mph.
Hi 39 °F
Mostly sunny, with a high near 39. West wind around 9 mph.
Lo 26 °F
Partly cloudy, with a low around 26. Northwest wind 3 to 7 mph.
000 FXUS61 KBOX 101801 AFDBOX Area Forecast Discussion National Weather Service Boston/Norton MA 101 PM EST Tue Dec 10 2019 .SYNOPSIS... Unseasonably mild temperatures will continue today. Another round of showers spreading in this afternoon. A strong cold front crosses the region this evening, followed by much colder temperatures. Showers will change to a period of accumulating snow later tonight into Wednesday morning, especially south of the Massachusetts Turnpike where a significant impact may occur during the morning commute. Snow will end by Wednesday afternoon. Large high pressure will bring cold and dry conditions Thursday and Friday. Developing low pressure across the southeast U.S. will shift up the coast with the potential for periods of heavy rain late Friday into Saturday, possibly beginning as a period of light snow across interior Massachusetts. Light rain may linger into early Sunday, then drier and cool weather returns late Sunday into Monday. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... No major changes to the forecast this morning. Updated the timing and sped up precipitation chances based on obs and near term guidance. Precipitation likely this afternoon across much of the eastern half of the CWA. Increased surface winds and associated gust a bit slower than the previous forecast to more closely match obs. Previous Discussion... Cloudy skies and mainly dry conditions in place early this morning. Noting a few bands of showers lingering off the S coast, which should pass across Nantucket and Martha's Vineyard through mid to late morning. Another area of light precip across central NY may push across western Mass by mid morning or so as it shifts E-NE, while one more well organized area across central and SW PA is also moving toward the region. This area should reach western MA into N central CT by around midday and will linger into the afternoon as it moves into central and northeastern areas. The day is starting off quite mild with temperatures in the upper 40s across portions of the CT valley ranging to the mid to upper 50s from near KBVY-KHFD southward to the Cape and islands. With the mainly dry conditions through at least mid morning, temps should rise a bit further before the next area of rain arrives. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM WEDNESDAY/... * Accumulating snow expected late tonight into Wed AM for much of the region, but a sharp cutoff is possible in northern MA * Significant impact to Wed AM Rush hour possible, especially across parts of northern CT, Rhode Island and Southeast MA Tonight and Wednesday... Quite the challenging forecast tonight into Wednesday morning. This revolves around snow amounts and a potentially significant impact to the Wed morning commute. Greatest concern is across parts of CT, RI/SE MA with a possible sharp cutoff in appreciable snow in northern MA. A cold front will cross the region this evening with temperatures quickly falling through the 40s and then into the 30s. However, an approaching shortwave will keep our region in southwest flow aloft into Wed morning. Very strong jet dynamics are in place as southern New England will be in the right rear quad of a 180 knot jet streak. This leads to a narrow, but very strong area of mid level frontogenesis in the 600 to 700 mb layer. Snowgrowth also looks favorable especially across portions of CT/RI and SE MA, where NAM indicates 20+ units of omega in the snowgrowth region for a short time. The problem is that the northern extent of the mid level frontogenesis and sufficiently deep moisture remains uncertain. It will also be short-lived and offset by low level drying with WNW winds just off the deck. This is what makes these anafrontal waves so difficult to forecast even inside 12 to 24 hours. There often can be a narrow area of moderate to heavy snow and a sharp cutoff to the north. Based on model consensus and overall pattern recognition, thinking a general 1 to 4 inches of snow across the region. Greatest risk for the higher amounts will be south of the Pike across portions of CT/RI and SE MA. If the dry air ends up being a little stronger than expected, snow accumulations will be on the order of a coating to 2 inches with little if any accumulations north of the MA Turnpike. On the flip side of the coin, if forcing/deeper moisture ends up a bit further north may see a swath of 4 to 6 inches of snow. After collaboration with surrounding offices, opted to go with a Winter Weather Advisory late tonight into Wed AM for northern CT, RI, as well as south central and southeast MA. The biggest concern is the strong mid level frontogenesis coinciding with the Wed Am rush hour. While amounts may not reach advisory criteria across the entire area, moderate to briefly heavy snow may impact the morning commute and that can often be quite problematic. Therefore, felt the Winter Weather Advisory was warranted. Fortunately, this system is progressive with the snow pretty much over by afternoon. High temperatures will remain in the 30s, which will be a big change after today/s anomalously mild temps. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... Highlights... * Dry conditions and colder than normal temperatures Wednesday night and Thursday * Temperatures moderate as next weather system brings the potential for heavy rain & localized flooding late Friday into Saturday * Leftover rain/snow showers linger into early Sunday as a cold front approaches Details... Wednesday night through Thursday night... Large 1040 hPa high pressure will shift east across the Ohio valley and across the northeast during this timeframe. Temperatures will run around 10 degrees below normal as H85 temps run from -9C to -15C from S to N into Thursday. Will see dry conditions thanks to the strong subsidence as the high passes. It will feel even colder on Wed night as W-NW winds at 10-15 kt with gusts up to 25 to 30 kt across the higher terrain and along the immediate coast. Wind chill values will range from the single digits to mid teens Wed night, then in the teens to lower 20s during Thursday though the winds will diminish during the afternoon. The center of the high will allow winds to become light and variable or calm winds by Thu night, though will become light E-SE along the coast as the high shifts E after midnight. Lows will mainly be in the teens, ranging to the 20s along the immediate coast. Clouds will start to increase across the interior after midnight. Friday through Saturday night... ***Heavy Rain and Flood Potential*** A developing mid level wave across the southern tier states will start to take shape across the SE U.S. Thu/Thu night, will see SE winds beginning to bring low level moisture into the region. Noting H5 long wave trough digging out of the midwest to the SE states, which will set up a strong SW mid level wind flow allowing the deep layer moisture to work into the northeast late Friday through Saturday. With the cold air in place at the onset of the precip, will start off as light snow across most areas except along the immediate S coast where temps will be around or above freezing. As winds shift to S-SW, the milder air may lift aloft, so could see a thin band of mixed precipitation. However, the colder air will continue to shift SE overnight, so should see any mixed precip change over to snow. GEFS model ensemble signaling a deep moisture plume working up the eastern seaboard as well. This plume will shift NE across the region late Fri or Fri night, with PWATs up to 2-3 SD above normal (about 1.2 to 1.5 inches). However, the H5 steering pattern, while amplified, remains progressive so should see the precip to shift NE. The heaviest rain is expected from late Friday night through midday Saturday, with current forecast totals from 1.2 to 1.6 inches regionwide. However, these amounts may change depending upon the timing and track of the area of heavier rain may fall. These rainfall amounts may combine with any snow to cause clogged catch basins which may result in localized urban and poor drainage flooding. This heavy rain, along with the rainfall from today's event, may cause an increase in river flooding generally during Saturday. Will continue to monitor river levels for any rises. Expect temps on Saturday to be mild, ranging from 45-50 across the higher terrain to the mid 50s across the coastal plain. Sunday and Monday... Low pressure will shift NE into Maine and the Maritimes by Sunday morning, though light rain may linger especially near and N of the Mass Pike. Another cold front may wrap around the departing low late Sunday or Sunday night. May see the rain mix with or change to snow, but looks like the best chance may occur across the E slopes of the Berkshires and possibly the northern Worcester hills during the afternoon before tapering off. Another cold front will sweep across the region by Monday morning, bringing gusty W-NW winds and colder air across the region. Current forecast suggests highs will run close to seasonal levels. && .AVIATION /18Z TUESDAY THROUGH SUNDAY/... Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short Term /through Wednesday/... Through 00z... Conditions lowering to MVFR/IFR in stratus with showers developing through the afternoon. Areas of LLWS and G25 kt over the Cape/Islands. Tonight and Wednesday...Moderate confidence. Winds shift to the NW tonight behind a strong cold front. Cigs may temporarily lift to VFR in the evening across portions of the interior. Showers will change to a period of snow 00-06z interior and 06-10z along the coast. MVFR/IFR conditions, with a period of LIFR and brief moderate/heavy snow possible across RI and SE MA late tonight and Wed morning. Conditions quickly improve to VFR with clearing skies from NW to SE late morning into the afternoon. KBOS Terminal...Moderate confidence in TAF. Rain changing to snow around 06z and ending 13-14z. 1-2 inches possible with an impact to the morning push. KBDL Terminal...Moderate confidence in TAF. Rain changing to snow 04-06z ending 12-13z. 1-2 inches possible with an impact to the morning push. Outlook /Wednesday Night through Saturday/... Wednesday Night through Thursday: VFR. Windy with local gusts up to 30 kt. Thursday Night: VFR. Friday: MVFR/IFR conditions possible. Breezy. Chance RA, slight chance SN. Friday Night: Mainly IFR, with areas MVFR possible. Breezy. RA. Saturday: Mainly MVFR, with areas IFR possible. Breezy. RA likely. && .MARINE... Short Term /through Wednesday/... Today...High confidence. SW winds with gusts of 20 to 30 knots for the rest of today. Long southwest fetch will continue to result in 7 to 13 foot seas across the outer waters. Small Craft Advisory in effect for the Coastal Waters. Showers become more numerous again late today. Tonight and Wednesday...High confidence. Winds shift to the NW this evening behind a strong cold front. NW 20 to 25 knot gusts expected into Wed. Showers tonight will change to snow for a time Wed morning before things wind down by mid afternoon. Reduced vsbys expected. SCA headlines will likely be needed for seas and marginal 25 knot wind gusts across the open waters. Outlook /Wednesday Night through Saturday/... Wednesday Night: Low risk for gale force winds with gusts up to 35 kt. Local rough seas. Thursday: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Local rough seas. Thursday Night: Winds less than 25 kt. Friday: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain. Local visibility 1 to 3 nm. Friday Night: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Rain. Saturday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 13 ft. Rain likely. && .CLIMATE... Record highs for Today (12/10). Best chance to tie or break record would likely be at Boston. BOS ... 64/1907 PVD ... 67/1946 BDL ... 67/1946 ORH ... 63/1946 && .BOX WATCHES/WARNINGS/ADVISORIES... CT...Winter Weather Advisory from 10 PM this evening to noon EST Wednesday for CTZ002>004. MA...Winter Weather Advisory from 10 PM this evening to noon EST Wednesday for MAZ012-013-015>022. RI...Winter Weather Advisory from 10 PM this evening to noon EST Wednesday for RIZ001>007. MARINE...Small Craft Advisory until 7 PM EST this evening for ANZ231>234-251. Small Craft Advisory until 5 PM EST this afternoon for ANZ230- 236. Small Craft Advisory until 1 PM EST Wednesday for ANZ235-237- 250-254>256. && $$ SYNOPSIS...Frank/EVT NEAR TERM...Frank/EVT SHORT TERM...KJC/BL LONG TERM...EVT AVIATION...KJC/EVT MARINE...Frank/EVT CLIMATE...
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.
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4 snow days in December
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No alerts/warnings active for Southeast Middlesex County or Middlesex County.
Alerts active nearby in: Barnstable; Bristol County, RI; Eastern Kent, RI; Eastern Norfolk; Eastern Plymouth; Hartford County, CT; Newport, RI; Northern Bristol; Northwest Providence, RI; Southeast Providence, RI; Southern Bristol; Southern Plymouth; Southern Worcester; Suffolk; Tolland County, CT; Washington County, RI; Western Kent, RI; Western Norfolk; Western Plymouth; Windham County, CT