Lexington Weather

Lexington, Massachusetts, USA

54°F

11/10/2025 2:31am

Lexington Conditions: Fog, Overcast
Temperature: 54.0°F / 12.2°C
Dew Point: 52.9°F
Relative Humidity: 96%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.62 in Falling Slowly
Visibility: ¼ mile
Rain Today: 0.00 in

Southeast Middlesex County, MA - Special Weather Statement
- SEE ALL NEARBY ALERTS -

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 050510
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
1210 AM EST Wed Nov 5 2025

.SYNOPSIS...
Winds gradually slacken tonight as high pressure builds south 
of new England. Dry and seasonably mild conditions Wednesday 
with increasing SW winds, then a strong cold front will move 
through Wednesday evening which will be accompanied by a few 
showers and possibly a thunderstorm. Behind the front strong to 
damaging wind gusts will develop late evening and overnight 
gradually diminishing during Thursday. High pressure builds into
the region Thursday night and moves offshore Friday. Weather 
pattern turns unsettled next weekend as a series of frontal 
systems move through, followed by blustery and colder weather 
early next week.

&&

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

* Diminishing winds tonight

Gusty winds will diminish through the evening as high pres 
moves off the mid Atlc coast and gradient slackens. Mostly 
clear skies but expect enough wind through most of the night to
limit ideal radiational cooling. Winds will become light but 
probably not until late tonight. Lows will range through the 
30s, with lower 40s Cape/Islands and Boston metro.

&&

.SHORT TERM /TONIGHT THROUGH 6 PM THURSDAY/...
Key Messages: 

* Increasing afternoon clouds Wed with breezy SW winds developing
 
* Strong cold front passage will be accompanied by scattered showers 
  and possibly a brief t-storm Wed evening

* Strong to damaging wind gusts 55-65 mph develop late Wed
  evening and overnight behind the front. Tree damage and power
  outages likely

Wednesday...

Fairly robust shortwave and frontal wave moves through the Gt Lakes. 
Developing warm advection pattern will result in sunshine giving way 
to increasing afternoon clouds, but dry conditions will  persist 
through the day. Developing SW low level jet will result in gusty SW 
winds developing through the afternoon, especially near the 
immediate south coast and Cape/Islands late in the day where 
potential for gusts 30-40 mph toward evening. Highs will top 
out in the 50s, to near 60 along the south coast. 

Wednesday night...

Strong shortwave passage Wed evening with frontal wave tracking the 
north will push a strong cold front through SNE during the late 
evening, roughly 03-06z. Expect scattered showers to accompany the 
front. Not much instability in the pre-frontal environment with 
MUCAPES only up to 100 J/kg. But steep mid level lapse rates and 
modest low level convergence may be enough to support an isolated t-
storm or a line of enhanced convective showers with the actual 
frontal passage. If a convective line were to develop, it would 
likely be accompanied by strong to damaging wind gusts given the 
strong pressure fall-rise couplet with the front. However, whether 
this happens or not there will be a period of damaging wind gusts 
developing in the strong cold advection behind the front. Pretty 
robust 850 mb jet 60-65 kt which is quite impressive for W-NW flow. 
Soundings show a well mixed boundary layer with mean winds in the 
boundary layer 45-50 kt and winds at the top of the mixed layer 60-
65 kt. Just taking an average of these winds support peak wind gusts 
55-65 mph across all of SNE with potential for 70 mph gusts over the 
Cape/Islands. These winds will be capable of producing tree damage 
and power outages. As a result we issued a high wind watch. The 
period of strongest gusts are expected between 11 pm and 6 am.

&&

.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
Key Messages:

* Active pattern through early next week

* Strong winds from passing clipper system expected to last 
  into Thursday. High Wind Watch in effect into Thursday morning.

* Mostly seasonable temperatures through the week with highs 
  mostly in the 50s, occasionally dipping into the 40s

Guidance continues to trend towards a generally unsettled pattern 
into early next week interspersed with periods of dry weather. The 
first of the systems is expected to exit Thursday morning after 
arriving overnight Wednesday as a low passes over northern New 
England. Showers that develop associated with this frontal passage 
will likely be exiting as the clipper system kicks out in the 
morning hours. Post-fropa, winds remain gusty through the day, 
though they should slacken as the day progresses and pressure rises 
quickly. Lows Thursday night may fall into the 20s as well with as 
skies clear and winds weaken, which may be a concern if the winds 
Wednesday night lead to power outages. With high pressure building 
in through the day Thursday and into Friday, dry weather is expected.

This break in the unsettled pattern is not expected to last long as 
another system approaches heading into the weekend. NAEFS guidance 
remains consistent in showing IVT at the 90th percentile in 
climatology Friday night, which lines up with S flow advecting in 
warmer, more moist air; guidance remains consistent in indicating 
925 mb temperatures approaching 10C in this period. Ensemble mean 
PWAT values are also approaching 1.00" late Friday night, and with 
lows warmer in the 40s and 50s, rain showers continue to look more 
favorable. High pressure makes a return again to dry the region out 
briefly ahead of anomalous troughing that guidance indicates may 
continue into early next week, sinking temperatures and bringing in 
more unsettled conditions.

&&

.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 Wednesday: 

VFR. WNW wind gusts 35-40 kt dropping off by 21z. 

Tonight: High confidence. 

VFR. WNW gusts to 25-30 kt Cape/Islands early diminishing and
becoming light overnight.

Wednesday: High confidence. 

VFR, with increasing mid-high clouds. Wind becoming SW 10-20 kt
in the afternoon, with gusts to 30-35 kt developing along the 
south coast and Cape/Islands by late in the day.

Wednesday night: High confidence.

VFR-MVFR cigs with brief scattered showers and possibly an
isolated t-storm during the evening, then clearing overnight.
Wind shift to WNW 03-06z with cold front passage followed by 
strong wind gusts to 50-55 kt, possibly as strong as 60 kt 
Cape/Islands. 

KBOS Terminal... High confidence. 

KBDL Terminal... High confidence.

Outlook /Thursday Night through Sunday/... 

Thursday: VFR. Strong winds with gusts up to 50 kt. 

Thursday Night: VFR. Breezy. 

Friday: VFR. Windy with local gusts up to 30 kt. 

Friday Night: MVFR/IFR conditions possible. Windy with local
gusts up to 30 kt. RA likely.

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

Saturday Night: VFR. Slight chance RA.

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

&&

.MARINE...
Forecaster Confidence Levels...

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

Key Messages:

* Diminishing wind through tonight 

* Increasing SW winds Wed reaching gale force over southern waters 
  toward evening

* Widespread storm force winds Wed night after wind shift to W-NW. 
  Gusts 50-60 kt. 

Gale force wind gusts drop off this evening and diminish below 20 kt 
overnight. Increasing SW winds Wed with 30-40 kt gusts developing 
over southern waters late Wed. Winds shift to W-NW behind a cold 
front during Wed evening followed by widespread storm force gusts 50-
60 kt. Peak winds will be 04-12z Thu. Seas build to 12-15 ft over 
outer waters late Wed night.

Outlook /Thursday Night through Sunday/... 

Thursday: Low risk for storm force winds with gusts up to
50 kt. Rough seas up to 15 ft. 

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

Friday: Low risk for Small Craft Advisory winds with gusts up
to 30 kt. Seas locally approaching 5 ft. 

Friday Night: Strong winds with gusts up to 30 kt. Areas of
rough seas. Rain likely. 

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

Saturday Night: Winds less than 25 kt. Local rough seas. Slight
chance of rain. 

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

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...High Wind Watch from this evening through Thursday morning for 
     CTZ002>004.
MA...High Wind Watch from this evening through Thursday morning for 
     MAZ002>024-026.
RI...High Wind Watch from this evening through Thursday morning for 
     RIZ001>008.
MARINE...Storm Warning from 10 PM this evening to 7 AM EST Thursday for 
     ANZ230-233>237.
     Storm Warning from 10 PM this evening to 10 AM EST Thursday 
     for ANZ231-232-250-251.
     Storm Warning from 7 PM this evening to 10 AM EST Thursday for 
     ANZ254-255.
     Storm Warning from 7 PM this evening to 7 AM EST Thursday for 
     ANZ256.

&&

$$

SYNOPSIS...KJC/Hrencecin
NEAR TERM...KJC
SHORT TERM...KJC
LONG TERM...Hrencecin
AVIATION...FT
MARINE...KJC/Hrencecin