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Clear
Humidity: --
Wind: 13 mph
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Snowfall amounts continued to increase slightly for late Tuesday into Tuesday night, mainly across northern and northeast MA.
1 Key Message 1
Another cold night tonight, but with less wind.
2 Key Message 2
A quick moving clipper system will bring a period of accumulating snow late Tue into Tue night.
3 Key Message 3
Upcoming period of dry, sunny days with seasonable temperatures.
Key Message 1... Another cold night tonight, but with less wind.
Ridge of high pressure advecting west to east across New England tonight. This will support mainly clear conditions and diminishing winds, combined with a deep snowpack. This will result in lows in the single digits regionwide. The exception will be along the immediate coast, Cape and islands, along with the urban areas where mins will settle in the teens. Not as cold as previous nights, nonetheless, colder than normal. Also, not as much of a wind chill factor given the light winds. Minimum temps were derived from the NBM and MOS datasets. We didn't want to follow the coldest guidance, as some mid level cloudiness from time to time overnight by preclude the coldest temp from verifying. Nevertheless, a chilly/colder than normal night.
Key message 2... A quick moving clipper system will bring a period of accumulating snow late Tue into Tue night.
Fairly potent northern stream shortwave moves into northern New England Tue night...as the parent surface low passes to the north. First band of warm advection light snow/flurries will overspread the area 4PM-7PM west to east. Little if any accumulation will occur with this first round. The steadier/accumulating snowfall will occur roughly between 7 PM and midnight. This will be more dynamical driven and will be accompanied by a 2-4 hour window of moderate snow, supported by 10-15 ubar/s of lift in the DGZ. This strong forcing for ascent induces a weak secondary low that tries to develop along the boundary over or near SE MA.
Snow may end as period of rain along the south coast, in response to modest low level WAA. Elsewhere, snow may end as a brief period of freezing drizzle, as the DGZ dries out after midnight. Given all the parameters above, expecting a coating up to 2 inches of snowfall across CT/RI and southeast MA, possible followed by a trace of ice before ending. For northern MA, 1-3" is likely with localized amounts of 4+ in northeast MA, followed by a trace of ice before ending. If 00z guidance trends stronger/more qpf, the evening/night shift may issue winter weather headlines. Stay tuned.
Key Message 3... Upcoming period of dry, sunny days with seasonable temperatures.
Expecting a few days of dry weather after the clipper system moves through Tuesday night/Wednesday morning. Winds return to predominately northwesterly Wednesday, then high pressure begins to build in over the Midwest/Mid-Atlantic regions Thursday. Once the arctic airmass finally gets pushed offshore, we'll see a return to more seasonable temperatures. High temperatures make it back to the mid to upper 30s over southern New England from Wednesday onward, though nighttime lows will still fall into the teens and low 20s, with some spots in the interior in the single digits. Thankfully though, wind chills will not be as low as we have seen over the last few weeks.
Ridge of high pressure advecting west to east across New England tonight. This will support mainly clear conditions and diminishing winds, combined with a deep snowpack. This will result in lows in the single digits regionwide. The exception will be along the immediate coast, Cape and islands, along with the urban areas where mins will settle in the teens. Not as cold as previous nights, nonetheless, colder than normal. Also, not as much of a wind chill factor given the light winds. Minimum temps were derived from the NBM and MOS datasets. We didn't want to follow the coldest guidance, as some mid level cloudiness from time to time overnight by preclude the coldest temp from verifying. Nevertheless, a chilly/colder than normal night.
Key message 2... A quick moving clipper system will bring a period of accumulating snow late Tue into Tue night.
Fairly potent northern stream shortwave moves into northern New England Tue night...as the parent surface low passes to the north. First band of warm advection light snow/flurries will overspread the area 4PM-7PM west to east. Little if any accumulation will occur with this first round. The steadier/accumulating snowfall will occur roughly between 7 PM and midnight. This will be more dynamical driven and will be accompanied by a 2-4 hour window of moderate snow, supported by 10-15 ubar/s of lift in the DGZ. This strong forcing for ascent induces a weak secondary low that tries to develop along the boundary over or near SE MA.
Snow may end as period of rain along the south coast, in response to modest low level WAA. Elsewhere, snow may end as a brief period of freezing drizzle, as the DGZ dries out after midnight. Given all the parameters above, expecting a coating up to 2 inches of snowfall across CT/RI and southeast MA, possible followed by a trace of ice before ending. For northern MA, 1-3" is likely with localized amounts of 4+ in northeast MA, followed by a trace of ice before ending. If 00z guidance trends stronger/more qpf, the evening/night shift may issue winter weather headlines. Stay tuned.
Key Message 3... Upcoming period of dry, sunny days with seasonable temperatures.
Expecting a few days of dry weather after the clipper system moves through Tuesday night/Wednesday morning. Winds return to predominately northwesterly Wednesday, then high pressure begins to build in over the Midwest/Mid-Atlantic regions Thursday. Once the arctic airmass finally gets pushed offshore, we'll see a return to more seasonable temperatures. High temperatures make it back to the mid to upper 30s over southern New England from Wednesday onward, though nighttime lows will still fall into the teens and low 20s, with some spots in the interior in the single digits. Thankfully though, wind chills will not be as low as we have seen over the last few weeks.
CT: None
MA: None
RI: None
MARINE: Small Craft Advisory until 5 PM EST this afternoon for ANZ230. Small Craft Advisory until 7 PM EST this evening for ANZ231-232-251. Small Craft Advisory until 7 AM EST Tuesday for ANZ250-254>256.
MA: None
RI: None
MARINE: Small Craft Advisory until 5 PM EST this afternoon for ANZ230. Small Craft Advisory until 7 PM EST this evening for ANZ231-232-251. Small Craft Advisory until 7 AM EST Tuesday for ANZ250-254>256.
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