Old Res Weather

Lexington, Massachusetts, USA

35°F

2/16/2025 7:17pm

Lexington Conditions: Overcast
Temperature: 35.1°F / 1.7°C
Dew Point: 32.4°F
Relative Humidity: 90%
Wind: Calm, 10-min avg: Calm, gust: None
Barometer: 29.00 in Falling Slowly
Visibility: 10 miles
Rain Today: 0.01 in
UV Index: $VPuv None

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 221939
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
339 PM EDT Wed Apr 22 2026

.WHAT HAS CHANGED...
Trended forecast drier tonight into Thursday.

&&

.KEY MESSAGES...

- Cloudy with patchy fog tonight. Becoming sunny by Thursday
  afternoon. Near normal temperatures expected.

- Generally dry conditions expected through early next week, 
  except a few low end chances for showers Sunday, with below 
  average temperatures.

&&

.DISCUSSION...
KEY MESSAGE 1...Cloudy with patchy fog tonight. Becoming sunny 
by Thursday afternoon. Near normal temperatures expected.

A weak low pressure passes by to our southwest tonight. A weak 
surface trough should also pass by around daybreak Thursday, 
eventually shifting winds to the west to northwest. This is a 
low chance for a few stray showers with this trough, but there 
does not appear to be much moisture to work with. At this time, 
favoring cloudy and drier conditions tonight into Thursday 
morning. Kept the mention of light showers out of this forecast 
update.

The clouds tonight and weak south winds should keep low 
temperatures closer to normal for late April, which then leads 
to near normal high temperatures once the sun breaks out during 
Thursday. Despite light north to northwest winds Thursday night,
temperatures should stay near average.

Boundary layer mixing and lowering dew points will lead to 
possible fire weather concerns Thursday. Expecting gusty west to
northwest winds of 15-25 mph and minimum relative humidity 
values of 25-35 percent. These conditions probably overlap for 
only a few hours before sundown.

KEY MESSAGE 2...Generally dry conditions expected through early
next week, except a few low end chances for showers Sunday, 
with below average temperatures.

A rather stagnant upper-level pattern dominates through most of
the weekend, bringing overall dry conditions to southern New 
England through the weekend. Ensemble guidance shows 850mb 
temperatures hovering near or just below 0C through Sunday, 
allowing for surface temperatures to remain below normal... 
generally in the mid to upper 50s. Guidance also continues to 
hone in on chances for brief rain showers Saturday night, but 
confidence remains low at this time as the airmass is projected 
to remain rather dry. 

Expecting high temperatures to continue to climb into the high 
50s or low 60s for the start of the next work week, with dry 
weather continuing.

&&

.AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
Forecaster Confidence Levels...

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

Through 00Z: Moderate confidence. 

Weak low pressure brings spotty intermittent -SHRA with 
unrestricted visibility. Mainly VFR conditions with areas of
MVFR, especially west of KLWM-KBED-KIJD, and across RI and
portions of SE MA.

Tonight: Moderate confidence. 

Ceilings deteriorate to MVFR/IFR, which should continue into the
pre-dawn Thursday hours. Uncertain if we see areas of mist/fog
but could be possible. Winds go light southeast.

Thursday: High confidence. 

Sub-VFR ceilings continue early but should begin to lift/scatter
to VFR bases with winds becoming WSW 5-10 kt. Winds then shift 
NW and increase to 10-13 kt with gusts 22-25 kt late in the day.

Thursday Night...High confidence.

VFR. 

KBOS Terminal...Moderate confidence in TAF. OVC mainly VFR
ceilings with intermittent -SHRA through about 20-21z. Any 
showers then come to an end, but with it brings better potential 
for ceilings to drop to MVFR overnight. Low risk for IFR, but
not usually the case with S winds becoming light SE overnight.
VFR  for Thursday.

KBDL Terminal...Moderate confidence in TAF. MVFR eventually
lowers to IFR overnight. VFR by the Thursday morning push.

Outlook /Friday through Monday/...

Friday through Friday Night: VFR. 

Saturday: VFR. Slight chance SHRA.

Saturday Night: Mainly VFR, with local IFR possible. Slight
chance SHRA.

Sunday through Sunday Night: VFR. Slight chance SHRA.

Monday: VFR. 

&&

.MARINE...
Forecaster Confidence Levels...

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

High confidence through this weekend.

Relatively light winds and seas expected through Thursday night.
Could be a few nearshore gusts up to 20 kt, but seas expected to
remain less than 5 feet.

Outlook /Friday through Monday/...

Friday through Saturday: Winds less than 25 kt. 

Saturday Night through Monday: Winds less than 25 kt. Slight
chance of rain showers. 

&&

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

&&

$$

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