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 070545
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
1245 AM EST Wed Jan 7 2026

.WHAT HAS CHANGED...
No significant changes since the previous forecast update. A Winter 
Weather Advisory remains in effect for the threat of freezing rain 
across portions of southern New England through this morning. Most 
locations along the I-95 corridor will experience a light glace of 
ice, though locations across interior southern New England may see 
an additional ice accumulation of 0.1". Plan on slick travel this 
morning.

&&

.KEY MESSAGES...

- Freezing rain creates hazardous road conditions this morning
  for much of southern New England. Improvements by late morning
  to early afternoon, quieter conditions tonight to Thursday. 

-  Pattern change brings in milder temperatures late week with
   periods of rain through the weekend. Gusty west winds late 
   Sunday into Monday.
   

&&

.DISCUSSION...
KEY MESSAGE 1...Freezing rain creates hazardous road conditions
this morning for much of southern New England. Improvements by 
late morning to early afternoon, quieter conditions tonight to 
Thursday. 

Ongoing freezing rain across portions of the area this morning is 
creating hazardous travel conditions on untreated surfaces. A Winter 
Weather Advisory in effect through 10 AM for northern Rhode Island, 
northern Connecticut, and much of Massachusetts away from southeast 
sections, including Cape Cod and the Islands. 

A low pressure system over the eastern Great Lakes continues to move 
east-northeast across central and northern New England. Ahead and 
east of the low, a mid-level warm front brought an initial band of 
precipitation Tuesday evening, with a surface warm front arriving a 
few hours later. This has allowed surface temperatures to rise above 
freezing across the coastal plain, temporarily ending the freezing 
rain threat. Interior and high-elecvation locations remain more 
susceptible, where cold air is still entrenched near the surface and 
freezing rain continues. Model guidance continues to show a weak 
secondary area of low pressure developing as the primary low exits. 
This will induce a rapid shift in winds to the northwest to north-
northwest, allowing colder air to drain southward. As a result, 
marginally warm surface temperatures may fall from the middle 30s 
into the lower 30s, bringing a renewed threat for freezing rain and 
possibly some snow showers on the back edge of the system as it 
wraps up and exits late this morning. Any lingering precipitation 
tappers off between 10 AM and 1 PM, with the remainder of the 
afternoon remaining cloudy and temperatures holding in the middle 
30s. 

Cold air advection for Wednesday night into Thursday morning, with 
drying conditions and northwest winds around 10 mph. Overnight lows 
fall below freezing, allowing any untreated wet surfaces to 
refreeze. By Thursday, increasing mid-level heights and high 
pressure build east from the Mid-Atlantic coast to the waters south 
of southern New England. Warm air advection supports milder a milder 
airmass, with afternoon highs in the middle 40s under partly to 
mostly clear skies. 

KEY MESSAGE 2...Pattern change brings in milder temperatures
late week with periods of rain through the weekend. Gusty west 
winds late Sunday into Monday.


There is good agreement among ensemble guidance for a pattern change 
later in the week favoring a period of milder temperatures and 
generally unsettled weather. A subtropical ridge builds in from the 
south into Friday accompanied by warming temperatures aloft. This 
will support above normal temperatures rising into the 40s to near 
50 during the day Friday. The northern stream pattern trends active 
Friday into the weekend with a series of shortwave troughs with a 
weak wave tracking to the north across the Great Lakes Fri-Sat 
followed by a deeper trough pushing across the northeast with a 
secondary low development. With ample moisture, this will support a 
few rounds of rain Friday through the weekend. 

SW flow aloft will help advect in above normal moisture into the 
region, around 250-300 percent of normal. This is certainly in the 
upper percentiles of climo. Ensembles show a more likely range of 
0.50 to 1" of rain, although there are some individual solutions 
that indicate potential for locally higher amounts. Something to 
keep an eye on for trends in future guidance. For timing, the first 
round of rain moves through Friday afternoon/Friday night. The 
second "wave" will be more robust/synoptically supported bringing in 
a period of steadier rainfall Saturday into Sunday. 

Relatively cooler air moves behind the system bringing seasonable 
temperatures Sunday into early next week. Gusty westerly winds are 
looking more likely later Sunday into Monday with an enhanced 
pressure gradient and some cold advection post cold-front. Ensemble 
guidance shows moderate probabilities (50-60%) for gusts greater 
than 40 mph for the east Berkshires and 30-50% probabilities for the 
Worcester Hills and Cape/Islands. 


&&

.AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
Forecaster Confidence Levels...

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

06z TAF update...

Through 12z... Moderate Confidence. 

Low cigs/vsbys becoming widespread IFR-LIFR as RA and FZRA 
overspreads the region. Mostly FZRA interior with brief snow 
possible at onset north of Route 2. Otherwise, rain near the 
coast. Light N-NE wind becoming E near the coast.

Today... Moderate Confidence. 

IFR-LIFR conditions persist in the morning with gradual improvement 
to MVFR-VFR through the afternoon away from the coast. Areas of FZRA 
or FZDZ in the interior may expand toward the E-NE MA coast during 
the morning. Winds shifting to N-NW during the morning increasing 
mid-late afternoon.

Tonight... High Confidence. 

Mainly VFR, although MVFR may linger into the evening for 
Cape/Islands. NW wind 5-15 kt.

Thursday... High Confidence. 

Dry. VFR. Light NW wind becomes W, less than 8 knots. Wind may 
become calm after 21z with high-pressure moving into the region. 

KBOS Terminal... Moderate Confidence. 

IFR cigs with LIFR cigs/vsbys developing late into Wed morning. Rain 
develops after 02z but could begin as a brief period of FZRA before 
temps climb above freezing. Winds shift back to N-NW Wed morning and 
that may lead to some -FZRA/-FZDZ as colder air is drawn southward. 

KBDL Terminal... Moderate Confidence.

Conditions lowering to IFR tonight with pockets of LIFR. Areas of 
FZRA develop after 00z transitioning to -RA/-DZ late tonight as 
temps climb above freezing.

Outlook /Thursday Night through Sunday/...

Thursday Night: VFR. 

Friday: Mainly VFR, with local MVFR possible. Breezy. Chance
RA, slight chance FZRA.

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

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

Saturday Night: Mainly MVFR, with areas IFR possible. Breezy.
RA.

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

&&

.MARINE...
Forecaster Confidence Levels...

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

Key Point:

- Small Craft Advisory in effect today & Wednesday for the southern 
waters and eastern outer waters for seas greater than 5 feet. 

Today through Thursday... High Confidence. 

Low-pressure system moves east of the Gulf of Maine with increasing 
winds from the W, gusts between 20 to 30 knots. Occasional mixed 
wintry precipitation tapper off from southwest to northeast during 
the late morning into the early afternoon. Seas across the southern 
waters increasing 4' to 8', eastern waters 3' to 6'. 

An area of high-pressure exits off the Mid Atlantic Coast on 
Thursday morning, settling over the southern waters. Seas and winds 
diminish, falling below advisory criteria.

Outlook /Thursday Night through Sunday/...

Thursday Night: Winds less than 25 kt. 

Friday through Friday Night: Low risk for Small Craft Advisory
winds with gusts up to 25 kt. Local rough seas. Chance of rain.

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

Saturday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Areas of rough seas. Rain. 

Sunday: Low risk for Small Craft Advisory winds with gusts up
to 30 kt. Rough seas up to 11 ft. Rain likely. 

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Winter Weather Advisory until 10 AM EST this morning for 
     CTZ002>004.
MA...Winter Weather Advisory until 10 AM EST this morning for 
     MAZ002>017-026.
RI...Winter Weather Advisory until 10 AM EST this morning for 
     RIZ001>004.
MARINE...Small Craft Advisory from 1 PM this afternoon to 1 AM EST 
     Thursday for ANZ235-237.
     Small Craft Advisory from 1 PM this afternoon to 7 AM EST 
     Thursday for ANZ250.
     Small Craft Advisory from 1 PM this afternoon to 1 PM EST 
     Thursday for ANZ254.
     Small Craft Advisory from 7 AM this morning to 1 PM EST 
     Thursday for ANZ255-256.

&&

$$

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