Lexington Weather

Lexington, Massachusetts, USA

32°F

11/19/2025 1:30am

Lexington Conditions: Clear
Temperature: 31.8°F / -0.1°C
Dew Point: 24.4°F
Relative Humidity: 74%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 30.09 in Steady
Visibility: 10 miles
Snow Today: 0.0 in

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 190443
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
1143 PM EST Tue Nov 18 2025

.SYNOPSIS...
High pressure builds overhead for Wednesday and Thursday,
bringing relatively light winds and continued seasonable
temperatures. A cold front will bring a period of unsettled 
weather Friday, which may linger into Saturday, then high 
pressure returns next Sunday.

&&

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

* Dry with below normal temperatures and increasing clouds
  towards the south coast

The wind finally dies off after sunset this evening as high
pressure builds overhead. A low pressure passes by to our south 
late tonight but we shouldn't see much more than increased 
cloud cover, with rain staying well to the south with too much 
dry air over southern New England. Good radiational cooling
conditions until the clouds arrive, so there should at least be
a few hours to permit temperatures to reach below normal levels.

&&

.SHORT TERM /WEDNESDAY NIGHT/...
Key Messages: 

* Mainly dry with below normal temperatures. 

Clearing skies as a passing low pressure moves offshore during
the morning hours. More clouds expected to return later
Wednesday night as another low pressure takes a similar track.
Dry weather expected to prevail with a weak high pressure and
abundant dry air in place. Not as windy Wednesday into Wednesday
night.

&&

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

* No impactful weather expected. 

Dry conditions and light winds continue Thursday with surface
high pressure remaining positioned across the region.
Temperatures will remain seasonably cool with highs in the mid
to upper 40s.

Ensemble guidance continues to agree on a northern stream
shortwave trough tracking to the north of the region Fri-Sat.
Weak warm advection and SW flow ahead of the trough will bring
in warmer temperatures with highs in the upper 40s for the
higher terrain and low-mid 50s elsewhere. A plume of slightly
above normal moisture pushes across the region for during the
day. This will be sufficient enough to support some scattered
showers Fri/Fri Night. Exact timing is still uncertain, but
model guidance is in good agreement with this being a low QPF
event. Recent runs have trended downward in amounts. Overall,
looking like a range from a trace to 0.25". Can't rule out light 
snow showers/flakes mixing in for the higher elevations of
northern MA if any showers develop early Fri or later Fri
night/early Sat AM.

A cold front will accompany the trough passage Saturday night, 
bringing in cooler temperatures aloft. Fairly zonal flow aloft 
Saturday with high pressure building in. This will bring dry and
cooler weather for Saturday with highs in the low to upper 40s.
Similar conditions prevail Sunday with the same pattern 
overhead. 

Early next week, ensemble guidance agrees with generally zonal
aloft aloft over the region with a few weak waves embedded in
the flow. Timing and moisture availability vary across solutions 
with some showing potential for light precipitation.
Temperatures will likely lean close to normal in the mid/upper 
40s to near 50 degrees.

&&

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

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


Rest of Tonight... High Confidence. 

VFR. Light westerly winds under 10 knots 

Wednesday and Wednesday night...High Confidence. 

VFR. West winds turning NW less than 10 knots. Showers possible
at ACK Wed morning, otherwise dry for the rest of the region. 

KBOS Terminal...High confidence in TAF. 

VFR. W winds turning NW around 10 knots.

KBDL Terminal...High confidence in TAF.

VFR. Light NW winds around 5 knots. 

Outlook /Thursday through Sunday/... 

Thursday: VFR. 

Thursday Night: Mainly VFR, with local MVFR possible. 

Friday: Mainly VFR, with local IFR possible. Breezy. Slight
chance RA.

Friday Night: Mainly VFR, with local MVFR possible. Slight
chance RA.

Saturday: VFR. Slight chance RA.

Saturday Night through Sunday: VFR.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Wednesday Night...High Confidence.

A weak low pressure passes south of the waters late tonight into  
Wednesday morning. A few early morning showers are possible for
the waters south of the islands, but expecting most of the
waters to remain dry with good visibility. Weak high pressure
over the waters leads to rather light winds and seas Wednesday 
through Wednesday night. 

Outlook /Thursday through Sunday/... 

Thursday through Thursday Night: Winds less than 25 kt. 

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

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

Saturday through Saturday Night: Winds less than 25 kt. Seas
locally approaching 5 ft. Slight chance of rain. 

Sunday: Winds less than 25 kt.

&&

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

&&

$$

SYNOPSIS...Belk/Mensch
NEAR TERM...Belk
SHORT TERM...Belk
LONG TERM...Mensch
AVIATION...KP
MARINE...Belk/Mensch