Old Res Weather

Lexington, Massachusetts, USA

35°F

2/16/2025 7:17pm

Lexington Conditions: Few Clouds
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 Lexington, MA

        
000
FXUS61 KBOX 101109
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
709 AM EDT Thu Sep 10 2026

.WHAT HAS CHANGED...
No significant changes to the forecast.

&&

.KEY MESSAGES...

- Scattered early morning showers quickly give way to plenty 
  of sunshine, breezy and unseasonable warm high temps well 
  into the 80s today.

- Plenty of sunshine with comfortable humidity Fri-Sat. Highs 
  mainly in the 70s. Lows Fri night in the 40s-lower 50s.

- Period of showers likely sometime late Sat night into Sun with
  perhaps some downpours. Dry & seasonable weather follows Mon. 

- Unseasonable warmth may return for a day or two by the middle
  of next week ahead of our next cold front.

&&

.DISCUSSION...
KEY MESSAGE 1...Scattered early morning showers quickly give way to 
plenty of sunshine, breezy and unseasonable warm high temps well 
into the 80s today.

Scattered showers early this morning will quickly exit the coastal 
plain by early-mid morning. Otherwise...westerly flow aloft and at 
the surface will allow skies to become mostly sunny by late morning-
early afternoon. Post frontal airmass still quite warm with 925T on 
the order of +22C to +24C. This coupled with lots of sunshine and 
westerly flow should allow highs to reach the middle 80s in many 
locations with even a few upper 80s possible. Bufkit soundings also 
indicate good mixing...so expect westerly wind gusts on the order of 
20 to 30 mph with a few gusts near 35 mph across parts MA especially 
the higher terrain. 

KEY MESSAGE 2...Plenty of sunshine with comfortable humidity Fri-
Sat. Highs mainly in the 70s. Lows Fri night in the 40s-lower 50s. 

Large high pressure builds in from the west Fri into Sat. This will 
result in absolutely beautiful September weather. Plenty of sunshine 
with highs mainly in the middle to upper 70s both days with very 
comfortable humidity. Mainly clear skies, light winds, and a dry 
airmass in place will allow for a good night of radiational cooling 
Friday night. Lows Fri night should mainly be in the 40s to the 
lower 50s and 55-60 in the Urban Heat Island of Boston. 

KEY MESSAGE 3...Period of showers likely sometime late Sat night 
into Sun with perhaps some downpours. Dry & seasonable weather 
follows Mon. 

High pressure moves off the coast for the second half of the weekend 
allowing a shortwave and associated mid-level warm front to 
approach. This will likely bring a period of showers sometime late 
Sat night and/or Sun. Pwats reach around 2 inches so some downpours 
are possible too...especially if there is a low level boundary in 
place. Some of the guidance indicates this potential near and south 
of the MA Turnpike...so something to watch over the next few days. 

A ridge of high pressure should return by Monday...bringing mainly 
dry and seasonable weather for the start of the next work week. 

KEY MESSAGE 4...Unseasonable warmth may return for a day or two by 
the middle of next week ahead of our next cold front.

An anomalous upper level ridge of high ridge will build across the 
southeast states during the first half of next week. This will 
result in west to southwest flow aloft and above normal height 
fields across southern New England. We will have to see how much 
southwest flow/mixing we can generate at the surface ahead of the 
next cold front. But given the setup...there is the potential for 
highs to reach back into the 80s for a day or two by the middle of 
next week ahead of the next cold front.

&&

.AVIATION /12Z THURSDAY THROUGH MONDAY/...
Forecaster Confidence Levels...

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

12z TAF Update...

Today...High confidence.

Mainly VFR, brief MVFR conditions are possible through early to
midmorning associated with brief scattered showers. Otherwise, SW
gusts of 20 to 30 knots early this morning will shift to more 
of a W direction later this morning and afternoon. Brief gusts 
up to 35 knots this morning towards the south coast and Cape 
Cod. 

Tonight...High confidence.

VFR. Diminishing NW winds which should decouple in the normal low-
lying locations overnight. 

Friday...High confidence. 

VFR. NW winds 6-12 knots. 

KBOS Terminal...High confidence in TAF. 

Wind shift from the SW to W occurs by 14/15z. Gusts diminish
after 01z. 

KBDL Terminal...High confidence in TAF.

Outlook /Friday Night through Monday/...

Friday Night through Saturday: VFR. 

Saturday Night: Mainly VFR, with local MVFR possible. Scattered
SHRA.

Sunday: Mainly VFR, with local IFR possible. Scattered SHRA.

Sunday Night through Monday: VFR.

&&

.MARINE...
Forecaster Confidence Levels...

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

Today through Thursday...High confidence.

Southwest winds were gusting to between 25 and 35 knots early this 
morning. The strongest of those wind gusts were the typically prone 
areas of near Buzzards/Cape Cod Bay as well and Nantucket sound. 
Buoys indicating SW winds gusting to around 35 knots in those 
spots...so Gale Warnings continue there this morning. 
Otherwise...WSW wind gusts of 20-30 knots expected later this 
morning and afternoon across all waters. Strongest of those will
be nearshore...but small craft headlines will remain in effect 
for the rest of our waters through the afternoon. 

Winds diminish below small craft advisory thresholds by early-mid 
evening...But will keep SCA headlines for our southern outer-waters 
into the overnight hours for lingering 5 foot swell. 
Otherwise...winds/seas should drop below small craft advisory 
thresholds for all waters shortly after midnight and persist into 
Friday. This a result of high pressure building in from the west.

Outlook /Friday Night through Monday/...

Friday Night through Saturday: Winds less than 25 kt. 

Saturday Night: Winds less than 25 kt. Isolated rain showers. 

Sunday: Winds less than 25 kt. Scattered rain showers. 

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

Monday: Winds less than 25 kt.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 8 PM EDT this evening for ANZ230-
     235>237-250-251.
     Gale Warning until noon EDT today for ANZ231>234.
     Small Craft Advisory until 2 AM EDT Friday for ANZ254>256.

&&

$$

DISCUSSION...Frank
AVIATION...Frank/Dooley
MARINE...Frank