Old Res Weather

Lexington, Massachusetts, USA

35°F

2/16/2025 7:17pm

Lexington Conditions: Clear
Temperature: 35.1°F / 1.7°C
Dew Point: 32.4°F
Relative Humidity: 90%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.00 in Falling Slowly
Visibility: 10 miles
Rain Today: 0.01 in
UV Index: $VPuv None

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 231110
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
610 AM EST Sun Nov 23 2025

.SYNOPSIS...
Few passing showers or flurries are possible today as an upper level 
disturbance moves through, then high pressure returns Monday. A warm 
front will bring a period of rain from late Tuesday into Wednesday 
morning, mild with a continued chance of showers Wednesday into 
Wednesday night ahead of an approaching cold front. Cooler and 
blustery conditions follow behind the front for Thanksgiving Day, 
then windy and cold weather for next Friday and Saturday.

&&

.NEAR TERM /THROUGH TONIGHT/...
Key Messages: 

* Patchy areas of black ice this morning.

* Isolated pop up showers today with snow mixing in for the high 
  terrain

Shortwave trough and weak cold front exit the Great Lakes this 
morning, moving through the region this afternoon into tonight. 
Modest upper-level forcing via PVA and mid-level moisture will lead 
to scattered rain showers much of the afternoon and evening.  Snow 
will mix in across the interior, mainly north and west Worcester, as 
dry air near the surface will keep wetbulb temps near or below 
freezing, even with actual temperatures in the upper 30s.  Unlikely 
to see any accumulating snow outside the highest terrain in the 
northern Berkshires, where temps will be cold enough to keep rain 
from mixing in.  As for rain accumulations, showers will be light, 
only dropping a couple of hundredths of an inch. Highs across the 
region will top out in the upper 30s to low 40s with SW winds around 
5-10 mph.

&&

.SHORT TERM /MONDAY/...
Tonight:

Remaining showers exit offshore by midnight with drying and clearing 
conditions thereafter.  Winds remain elevated overnight out of the 
west at 5-10mph, which will help keep overnight lows from bottoming 
out in the low 20s, instead staying in the upper 20s to low 30s.

Monday:

An upper-level ridge and surface high pressure bring back sunny 
skies to the region at the start of the short workweek.  850mb Temps 
warm from -5C to +2C, helping high temps jump into the upper 40s to 
low 50s.  The warming temps bring a return to breezy conditions with 
WNW winds at 10-15mph for Monday afternoon.

&&

.LONG TERM /MONDAY NIGHT THROUGH SATURDAY/...
Key Messages: 

* Dry and seasonable Tuesday. Rain Tuesday night into Wednesday as a 
  warm front lifts across the region, turning mild with showers for 
  Wednesday afternoon.

* Cooler conditions return Thursday into this weekend, along
  with a lower chance of rain and snow showers, and breezy
  conditions.

Overview: Tuesday the trough axis shifts east of New England and the 
mid-level heights increase with a 1025mb surface high southwest of 
the region. Rain arrives late Tuesday into Wednesday morning due to 
a warm frontal passage, showers continue into Wednesday along with 
mild conditions as southern New England is firmly placed in the warm 
sector. A robust shortwave and cold frontal passage Wednesday night 
into early Thanksgiving morning. The trough becomes cut off across 
the high latitudes late Thursday into Friday, and moves to the 
Canadian Maritimes this coming weekend. Passage of the cold front on 
Thanksgiving leads to CAA and a period of gusty west-northwest wind 
on both Thursday and Friday, as the magnitude of the 850mb jet 
increases between 40 and 55 knots. High pressure returns for the 
start of next weekend with diminishing winds. 

Precipitation: Mentioned above, the next chance for rain arrives on 
Tuesday during the late afternoon to early evening with the passage 
of a warm front. Southwesterly 850mb winds transport higher moisture 
with PWATs increasing up to an inch and there is growing confidence 
there will be enough assent to support those widespread shower into 
the overnight hours, ending early Wednesday morning. Rain becomes 
showery for Wednesday as the region remains in the warm sector. As 
for rainfall, not expecting any significant totals at this time. The 
probabilities of 0.5" or more are roughly 40 to 60 percent. The cold 
front moves through overnight and exits early Thanksgiving morning. 
As temperatures fall, upslope snow flurries are possible across the 
high terrain of northern and northwest Massachusetts. PWATs fall 
considerably behind the front, but a persistent west-northwest flow 
could allow for lake effect snow showers to come off the eastern 
Great Lakes, leading to periods of festive flurries in far western 
areas. Otherwise, dry weather prevails into this coming weekend as 
high pressure develops. 

Temperatures: 

A brief warmup is anticipated Tuesday and especially Wednesday as the 
flow aloft turns to the southwest, 925mb temperatures reaching near 
+12C by Wednesday afternoon! Expecting seasonal conditions Tuesday 
as highs reach the low to middle 50s, with upper 40s in the high 
terrain. Wednesday feels spring-like as highs top off near 60F 
across the coastal plain while the rest of the region are in the 
upper and middle 50s. Behind the cold front, 925mb temperatures fall 
to 0C on Thanksgiving, and then -5C to -3C for Friday and Saturday. 
Cooler for Thanksgiving day, with highs in the upper 40s near the 
coast and lower 40s across the high terrain. Friday and Saturday are 
chilly with highs in the low 40s to upper 30s. Mind you, there will 
be a gusty west-northwest wind which will make it feel as if it were 
below freezing both afternoons. As for nighttime lows, there is no 
significant cold on the horizon, lows are at or above freezing 
Tuesday and Wednesday night, then sub-freezing lows Thursday night 
through Saturday night.

&&

.AVIATION /12Z SUNDAY THROUGH THURSDAY/...
Forecaster Confidence Levels...

Low - less than 30 percent. 
Moderate - 30 to 60 percent. 
High - greater than 60 percent.

12z TAF Update:

Today: High confidence.

VFR with periods of MVFR possible in the afternoon. Isolated
rain showers pop up in the afternoon and continue into the 
evening. Snow may mix in with rain for the interior high terrain
including ORH. Accumulation will be light, so opted to use a
PROB30 for all TAFs sites including the Cape and Islands where 
a developing low pressure center gives a better chance for more 
then a trace of precip. Winds turn SW at 5-10 knots.

Tonight: High confidence.

VFR with periods of MVFR possible through about 06z. Lingering
showers move offshore by 03z. Winds increasing from the west at
5-10 knots. 

Monday: High Confidence

VFR. Increasing west winds at 10-15 knots, isolated gust up to 20
knots.

KBOS Terminal...High confidence in TAF. 

VFR. Isolated pop up showers possible this afternoon.

KBDL Terminal...High confidence in TAF.

VFR. Isolated pop up showers possible this afternoon.  

Outlook /Monday Night through Thursday/... 

Monday Night: VFR. 

Tuesday: Mainly VFR, with local MVFR possible. Breezy. Chance
RA.

Tuesday Night: MVFR/IFR conditions possible. Breezy. RA.

Wednesday: Mainly VFR, with local IFR possible. Chance RA.

Wednesday Night: Mainly VFR, with local IFR possible. Breezy.
Chance RA.

Thanksgiving Day: VFR. Breezy.

&&

.MARINE...
Forecaster Confidence Levels...

Low - less than 30 percent. 
Moderate - 30 to 60 percent. 
High - greater than 60 percent.

Today through Monday... High confidence.

Weak clipper system moves through the Saint Lawrence Valley before 
ejecting into the Gulf of Maine early Monday morning. With limited 
moisture, not expecting any significant precipitation during this 
time, but cannot rule out a spot shower/flurry. 

Seas and southwesterly wind remain below advisory criteria today and 
tonight. Wind becomes northwesterly on Monday with wind gusts on the 
outer waters increasing, between 20 and 25 knots. Seas are building 
too on the southern most outer waters, between 4 and 6 feet. 

As conditions are marginal, over a limited area (mainly for the 
southern outer water south of Block Island), and peak boating season 
has passed, opt'd to not issue an advisory at this time. 

Outlook /Monday Night through Thursday/... 

Monday Night: Winds less than 25 kt. 

Tuesday: Winds less than 25 kt. Slight chance of rain. 

Tuesday Night: Winds less than 25 kt. Areas of seas approaching
5 ft. Rain. 

Wednesday: Winds less than 25 kt. Areas of seas approaching
5 ft. Rain likely. 

Wednesday Night: Winds less than 25 kt. Local rough seas.
Chance of rain. 

Thanksgiving Day: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Areas of rough seas.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.

&&

$$

SYNOPSIS...Dooley/KP
NEAR TERM...KP
SHORT TERM...KP
LONG TERM...Dooley
AVIATION...Dooley/KP
MARINE...Dooley/KP