Lexington Weather

Lexington, Massachusetts, USA

39°F

1/8/2026 11:23am

Lexington Conditions: Clear
Temperature: 39.2°F / 4.0°C
Dew Point: 38.1°F
Relative Humidity: 96%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 30.09 in Steady
Visibility: 10 miles
Rain Today: 0.00 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 080525
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
1225 AM EST Thu Jan 8 2026

.WHAT HAS CHANGED...
No significant changes to the forecast. Patchy black ice this 
morning and then potential for freezing fog tomorrow morning. A 
chance of light rain Friday night, but a more robust system arrives 
Saturday night into Sunday with widespread rain and gusty wind. 

&&

.KEY MESSAGES...

- Patchy black ice this morning. Fog or freezing fog tonight
  into Friday morning. Light rain overnight Friday. 

- Rain late Friday through Sunday with a lull during the day on
  Saturday.

&&

.DISCUSSION...
KEY MESSAGE 1...Patchy black ice this morning. Fog or freezing fog 
tonight into Friday morning. Light rain overnight Friday. 

High pressure builds south of the region tonight. Will have dry but 
cold conditions with temperatures lowering into the low-30s and 20s. 
Lingering moisture from Wednesday will lead to slick surfaces if 
left untreated, an SPS highlighting the threat of black ice remains 
in effect through 9 AM. Motorist and pedestrians should use caution 
heading out either tonight or Thursday morning. Conditions improve 
midmorning as temperatures rise above freezing. As for the rest of 
Thursday, fairly quiet conditions with mid-level height rises and 
high pressure building near the Mid-Atlantic coast. Warm air 
advection supports milder a milder airmass, with afternoon highs 
ranging between 40F-45F. With high pressure and drying aloft, will 
have partly to mostly clear skies. Surface high pressure centered 
south of the region, with WAA cannot rule out patchy fog. Given the 
surface temperatures are below freezing, patchy freezing fog is 
possible late tomorrow night into Friday morning. Increasing 
southwest winds aloft bring in warmer conditions, 925mb temperatures 
rising between +4C to +6C Friday afternoon. Despite the cloud cover, 
afternoon highs reach the middle to upper 40s. Cannot rule out a few 
areas in southeastern Massachusetts touching 50F. A warm front lifts 
over southern New England Friday night into early Saturday morning, 
showery activity is possible, but a widespread washout isn't in the 
cards, mainly a tenth to two tenths of new precipitation. PWATs are 
well above climatology, but the best forcing is displaced further to 
the north across northern New England, with the parents low pressure 
system. No issues here with temperatures Friday night in the low-40s 
at the coast and upper 30s across interior locations. 

KEY MESSAGE 2...Rain late Friday through Sunday with a lull 
during the day on Saturday. 

The Thu/Fri subtropical ridge is suppressed late Friday by the first 
in a series of shortwaves rounding the broad trough upstream. As the 
surface low passes through Quebec it drags its warm front north 
through New England. This and a 45-55 kt LLJ act on an airmass with 
PWATs of 1-1.25" leading to warm advection showers late Friday into 
Friday night before the cold front briefly sinks south and drier air 
brings precip to an end for a time during the day on Saturday. The 
exception would be the south coast, depending on how far south that 
front gets (low confidence on who if anyone sees a prolonged lull in 
the wet weather). Quickly though the following system once again 
pushes warm and moist air over SNE late Saturday into Sunday and 
this is a more dynamic system that wants to develop a secondary low 
over SNE helping to squeeze out much more rain with the Saturday 
night/Sunday round. When all is said and done, the south coast may 
see 1-1.5 inches of rain with amounts closer to 0-5-1 inch further 
north. Ensemble guidance indicates a 50-80% chance of AOA 1" of rain 
for the Cape and Islands, lesser odds elsewhere. A decent LLJ 
accompanies each of these disturbances but inverted temperature 
profiles should keep the damaging wind aloft with just breezy 
conditions Friday and Sunday/Sunday night. The trailing cold front 
then brings drier and colder weather to start next week.

&&

.AVIATION /06Z THURSDAY THROUGH MONDAY/...
Forecaster Confidence Levels...

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

06Z TAF update...

Through 12z... High Confidence. 

Dry. VFR conditions across eastern MA & RI with MVFR over central 
and western MA & CT. Light West to West-Northwest winds. 

Today... High Confidence. 

Dry. VFR. West-northwest wind around 10 knots, wind may become calm 
after 00z with high-pressure moving into the region.

Tonight... Moderate Confidence. 

VFR ceilings, potential for fog or freezing fog with visibilities 
lowering 3SM to 5SM. South wind less than 5 knots. 

Friday... High Confidence. 

VFR, trending to MVFR by midafternoon as a warm front approaches. 
Showery rain possible around and after 00z.

KBOS Terminal... High Confidence. 

Occasional clusters of clouds with MVFR bases cross eastern MA 
through 09z, otherwise VFR today. West-northwest wind around 10 
knots. 

KBDL Terminal... High Confidence.

VFR today, potential for fog or freezing fog tonight into Friday
morning.

Outlook /Friday Night through Monday/...

Friday Night: MVFR/IFR conditions possible. Breezy. Chance RA.

Saturday: Mainly VFR, with local IFR possible. Breezy. RA.

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

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

Sunday Night: VFR. Breezy. Slight chance RA, slight chance SN.

Monday: VFR. Breezy. 

&&

.MARINE...
Forecaster Confidence Levels...

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

Today through Friday... High Confidence. 

High pressure exits the Mid Atlantic Coast this morning and moves to 
the waters south of southern New England. Wind & gusts remain light 
today, residual seas of 4 to 6 feet across the southern outer waters 
are the basis for a continued Small Craft Advisory through early 
this afternoon. A lull over the waters tonight, wind increases from 
the south on Friday as a warm front lifts over the region. Gusting 
between 20 to 25 knots and seas increasing 4 to 6 feet by Friday 
night. 

Outlook /Friday Night through Monday/...

Friday Night: Moderate risk for Small Craft Advisory winds with
gusts up to 25 kt. Local rough seas. Rain likely. 

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

Saturday Night: Low risk for Small Craft Advisory winds with
gusts up to 30 kt. Local rough seas. Rain. 

Sunday: Low risk for Small Craft Advisory winds with local
gusts up to 30 kt. Areas of rough seas. Chance of rain. 

Sunday Night: Strong winds with gusts up to 35 kt. Areas of
rough seas. Chance of rain. 

Monday: Moderate risk for Small Craft Advisory winds with gusts
up to 30 kt. Areas of rough seas. Slight chance of rain. 

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 1 AM EST early this morning for 
     ANZ235-237.
     Small Craft Advisory until 7 AM EST this morning for ANZ250.
     Small Craft Advisory until 1 PM EST this afternoon for 
     ANZ254>256.

&&

$$

DISCUSSION...Dooley/Mensch
AVIATION...Dooley/Mensch
MARINE...Dooley/Mensch