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 020533
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
1233 AM EST Fri Jan 2 2026

.WHAT HAS CHANGED...
Winter Weather Advisories have all been cancelled as storm has moved 
offshore. No changes for Sunday's snow potential. Still looking at a 
chance of snow showers with decreasing chances for a more 
substantial snow event. Increasing chances for light to moderate 
freezing spray Sunday night into Monday morning.

&&

.KEY MESSAGES...

- High pressure brings dry and cold weather through Saturday. 

- Increasing chance for snow showers on Sunday.

- Light to moderate freezing spray over the waters is 
likely into this weekend.

&&

.DISCUSSION...
Key Message 1...High pressure brings dry and cold weather through 
Saturday. 

As today's system continues to exit east, we'll see broad mid level 
troughing remain over the northeast through Friday with rising 
heights heading into the weekend. This and the associated cold, dry 
NW flow combined with surface high pressure moving ever closer 
through Saturday will make for a cold and dry stretch of weather. 
The main impact of note will be the gusty winds today into Friday as 
SNE is sandwiched between low pressure over Nova Scotia and high 
pressure to our west. The gradient is tightest this afternoon and 
evening which is when we expect to see the gustiest winds over land; 
however it will remain breezy into Saturday, especially over the 
waters. This increases concern for light freezing spray to cause 
issues as gusty cold winds blow over the relatively warm water. 
Given the cold airmass overhead (925 mb temps as cold as -15C) highs 
will be around 10 degrees colder than average, in the 20s to low 
30s. The only exception to the dry forecast would be the potential 
for the wind trajectory to briefly be favorable for some ocean 
effect snow showers on Nantucket during the early morning hours 
Friday. 

KEY MESSAGE 2...Increasing chance for snow showers on Sunday. 

12z guidance has come into better agreement on the potential for a 
period of light snow/ snow showers Sunday. General consensus still 
shows a very light event with both the ECMWF and GFS ENS showing 
very low (<10% chance) for 0.1" of QPF or greater. Slightly higher 
probs exist for the Cape and Islands, perhaps as high as 20-30%. 
Admittedly it will be difficult to see much more than a light and 
scattered snowfall from this setup as upper level confluent flow 
keeps the bulk of the moisture and forcing from a weak but moisture 
laden disturbance well offshore.  Thus, the areal extent and 
potential intensity of any snowfall will depend on the strength of a 
shortwave embedded in the northern branch of the jet. 

KEY MESSAGE 3...Light to moderate freezing spray over the 
waters is likely into this weekend.

A lengthy period of cold air over the warmer waters will give rise 
to the likelihood of freezing spray becoming a concern for mariners 
through at least Saturday, and possibly into early next week as 
well. There is potential for moderate freezing spray late tonight 
into early Friday, therefore a Freezing Spray Advisory has been 
issued for the waters off of Cape Ann, Buzzards Bay, Vineyard Sound, 
and Nantucket Sound. Another round of freezing spray is possible 
later Sunday into Monday behind a strong cold front that is forecast 
to pass through the region Sunday night.

&&

.AVIATION /06Z FRIDAY THROUGH TUESDAY/...
Forecaster Confidence Levels...

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

Today through Saturday...High confidence.

VFR through the TAF period. Gusty W winds across the 
Cape/Islands and eastern coast. Winds diminish to 5-10 kts this
afternoon and persists through Saturday morning.

KBOS Terminal...High confidence in TAF. 

KBDL Terminal...High confidence in TAF.

Outlook /Saturday Night through Tuesday/...

Saturday Night: VFR. Slight chance SN.

Sunday: VFR. 

Sunday Night through Monday: VFR. Breezy. 

Monday Night: Mainly VFR, with local MVFR possible. Chance SN.

Tuesday: Mainly VFR, with areas MVFR possible. Slight chance
RA, slight chance SN.

&&

.MARINE...
Forecaster Confidence Levels...

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

* Northwest Gale Force Winds through Friday morning along with 
  the threat of moderate freezing spray for some waters. 

Tonight...High Confidence. 

Gusty NW winds with Gale Force gusts through tonight for most 
waters. Easing wind by Friday morning. 

Threat for moderate freezing spray for waters north of Cape Ann
to the Merrimack River, as well as Buzzards Bay, Vineyard Sound, 
and Nantucket Sound between this evening and Friday morning.

Friday and Friday Night...High Confidence. 

W winds 15-20 kts with gusts 20-25 kts. Seas 3-6 ft.

Outlook /Saturday Night through Tuesday/...

Saturday Night through Sunday: Winds less than 25 kt. Slight
chance of snow. 

Sunday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas locally approaching 5 ft. Chance of
freezing spray. 

Monday: Winds less than 25 kt. Seas locally approaching 5 ft. 

Monday Night: Winds less than 25 kt. Slight chance of rain,
slight chance of snow. 

Tuesday: Winds less than 25 kt. 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 
     ANZ230-236.
     Gale Warning until 1 AM EST early this morning for ANZ231>235-
     237-251-256.
     Freezing Spray Advisory until 1 PM EST this afternoon for 
     ANZ232>234-250-251.
     Gale Warning until 7 AM EST this morning for ANZ250-254-255.

&&

$$

DISCUSSION...Belk/McMinn
AVIATION...Belk/McMinn
MARINE...Belk/McMinn