Old Res Weather

Lexington, Massachusetts, USA

35°F

2/16/2025 7:17pm

Lexington Conditions: Partly cloudy
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 090644
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
244 AM EDT Wed Sep 9 2026

.WHAT HAS CHANGED...

Gale Warnings hoisted for Buzzards Bay, Cape Cod Bay and Nantucket 
Sound later tonight into Thursday morning. 

&&

.KEY MESSAGES...

- Increasing clouds today especially across northern MA. Highs in
  the middle 70s-lower 80s. A few brief light showers possible toward
  evening especially across western and northern MA. 

- Gusty SW winds tonight into Thu and becoming humid as well. Brief 
  round of showers tonight into early Thu especially in 
  northern MA. Unseasonably warm Thu...Highs middle to upper 80s.

- Dry and very pleasant weather follows Fri into Sat. Highs in the 
  70s with low humidity. Quite cool Fri night/Sat am with lows in 
  the 40s to the lower 50s and perhaps even some upper 30s in the 
  normally coolest low lying locations. 

- Above normal temps return for the first half of next week with
  a brief round of scattered showers possible late Sat night-Sun
  am.

&&

.DISCUSSION...

KEY MESSAGE 1...Increasing clouds today especially across northern MA. 
Highs in the middle 70s-lower 80s. A few brief light showers possible 
toward evening especially across western and northern MA.

Large high pressure moves off the coast today as a cold front and 
shortwave energy approach from the west. This will result in 
increasing southwest flow today and a gradual increase in humidity. 
We also do expect to see an increase in clouds in the warm advection
pattern and developing southwest LLJ as the day wears along. In 
fact... we may see a few brief light showers toward evening 
especially across western and northern MA. High temperatures will 
mainly be in the middle 70s to the lower 80s. A southwest breeze 
will also kick in during the afternoon with gusts on the order of 15 
to 25 mph. 

KEY MESSAGE 2...Gusty SW winds tonight into Thu and becoming humid 
as well. Brief round of showers tonight into early Thu 
especially in northern MA. Unseasonably warm Thu...Highs middle to 
upper 80s.

As the actual cold front approaches from the west tonight into early 
Thu the southwest LLJ will increase further. All the guidance is in 
fairly good agreement in a southwest LLJ peaking between 45 and 55 
knots over this time. Bufkit soundings also indicate some modest 
mixing too. This should yield southwest wind gusts of 20 to 30 mph 
with a few brief gusts near 35 mph in the Worcester Hills and near 
the I-95 corridor. However...the strongest winds will likely be 
towards the Cape/Islands particularly in the climatologically 
favored spots with this setup near Buzzards Bay/Upper Cape. GFS/NAM 
soundings near KFMH indicating brief 35-45 mph wind gusts and not 
out of the question a few spots briefly flirt with Wind Advisory 
criteria. 

Lastly...the other issue will be potential for some 
showers. Pwats are quite impressive on the order of 2+ inches 
tonight into early Thu. However...the better dynamics will be to our 
north and the soundings indicate some mid level dry air which will 
be limiting factors. Nonetheless...we still expect a brief round of 
showers tonight into early Thu especially across northern 
MA. However...they will not last long at a given location. In 
fact...plenty of sunshine should develop on Thu and 925T on the 
order of +20C to +22C should yield highs in the middle to upper 80s 
in many locations. Westerly wind gusts of 20-30 mph are also 
expected with a bit of humidity too...especially during the first 
half of the day. 

KEY MESSAGE 3...Dry and very pleasant weather follows Fri into Sat. 
Highs in the  70s with low humidity. Quite cool Fri night/Sat am 
with lows in the 40s to the lower 50s and perhaps even some upper 
30s in the normally coolest low lying locations. 

Post frontal airmass will result in beautiful weather Fri into Sat 
with low humidity. Plenty of sunshine expected both days with highs 
in the 70s along with very comfortable humidity. High pressure 
overhead will allow for lows in the the 40s to the lower 50s with 
even some upper 30s possible in the normally coolest low-lying 
locations. 

KEY MESSAGE 4...Above normal temps return for the first half of next 
week with a brief round of scattered showers possible late Sat night-
Sun am.

High pressure moves off the coast for the second half of the weekend 
as a warm front crosses the region. This may bring a brief period of 
scattered showers to the region late Sat night into Sun morning. Its 
main impact will be a southwest flow of warmer air working back into 
the region. Ensembles are in agreement in above normal height fields 
and 2 meter temp anomalies for the first half of next week. This 
supports above normal temps for the first half of next week...mainly 
in the upper 70s to the middle 80s.


&&

.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...

Today...High confidence.

VFR despite an abundance of mid-level cloudiness. Light ESE winds 
becoming S-SW at 8-14 knots this afternoon. Winds may gust to 
between 20 and 25 knots this afternoon...strongest of those towards 
the south coast. 

Tonight and Thursday...High confidence.

Mainly VFR but some brief MVFR conditions mainly late tonight into 
early Thursday in a round of brief showers. SW winds of 10 
to 20 knots with gusts up to 30 knots especially across the 
Worcester Hills as well as the I-95 corridor. Strongest winds will 
be towards the Cape/Islands...especially in the vicinity of the 
Upper Cape where brief SW wind gusts of 35-40 knots are possible.

SW winds become more W during the day on Thu with gusts on the 
order of 20 to 30 knots. 

KBOS Terminal...High confidence in TAF. ESE sea breeze develops
this morning. The sea breeze should kick out in the 18z-20z 
time frame with the wind turning S. 

KBDL Terminal...High confidence in TAF.

Outlook /Thursday Night through Sunday/...

Thursday Night through Friday: VFR. Breezy. 

Friday Night through Saturday: VFR. 

Saturday Night: VFR. Slight chance SHRA.

Sunday: VFR. Breezy. Chance SHRA, slight chance TSRA.

&&

.MARINE...

Forecaster Confidence Levels...

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

Today through Thursday...High confidence. 

An approaching cold front will result in a developing southwest 
level jet later today. The southwest low level jet peaks later 
tonight into early Thu when 925 mb winds reach between 45 and 55 
knots. While not all of this will mix down...we expect widespread 
southwest wind gusts of 25 to 35 knots where have continued strong 
small craft headlines for most waters...but brief gale force gusts 
are certainly possible. We did upgrade Buzzards and Cape Cod Bay as 
well as Nantucket sound to Gale Warnings. Based on pattern 
recognition...a brief period of SW wind gusts of 35-40 knots appears 
reasonable and is supported by Bufkit soundings. 

Outlook /Thursday Night through Sunday/...

Thursday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Chance of rain showers. 

Friday through Saturday Night: Winds less than 25 kt. 

Sunday: Winds less than 25 kt. Chance of rain showers. 

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory from 8 PM this evening to 8 PM EDT 
     Thursday for ANZ230-235>237-250-251-254>256.
     Gale Warning from 10 PM this evening to noon EDT Thursday for 
     ANZ231>234.

&&

$$

DISCUSSION...Frank
AVIATION...Frank
MARINE...Frank