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 082345
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
745 PM EDT Tue Sep 8 2026

.WHAT HAS CHANGED...
Gale Watch continues, with Small Craft Advisories issued for waters 
not covered by the Gale Watch. Strongest winds Wednesday night into 
Thursday remain focused on far southeastern Massachusetts, Cape Cod, 
and the Islands.

&&

.KEY MESSAGES...

- Quiet and dry conditions through Wednesday afternoon.
 
- Frontal passage Wednesday night into Thursday morning brings 
  showers and gusty southwest winds, especially over far 
  southeastern Massachusetts, Cape Cod, and the Islands.

- Full sun, seasonable temperatures and onshore breezes Friday 
  into the weekend.

&&

.DISCUSSION...
KEY MESSAGE 1...Quiet and dry conditions through Wednesday afternoon.

Mainly quiet weather for the rest of today and tomorrow. This 
afternoon, a weak cold front pushes into the region from the 
northeast. There is little to no moisture to work with, so expect a 
dry frontal passage with a mixture of clouds. As for Wednesday, the 
front drifts back to the northeast as a warm front, with southerly 
winds advecting moisture back into southern New England and PWATs 
rising to 1.4 to 1.6 inches. While we cannot rule out a WAA shower 
during the day, the general theme is for a drier day with increased 
cloud cover. Otherwise, a seasonably warm day with highs in the 
upper 70s and lower 80s.

KEY MESSAGE 2...Frontal passage Wednesday night into Thursday 
morning brings showers and gusty southwest winds, especially over 
far southeastern Massachusetts, Cape Cod, and the Islands.

Shower chances increase Wednesday night into Thursday morning 
associated with a cold front. Though this doesn't look to be a 
soaking event, it will be more showery in nature, where one town 
sees a heavier downpour while two towns over perhaps only a light 
rain. More impressive are the low-level winds. Depending on your 
flavor of guidance, 925 mb winds are 45 to 55 knots. However, the 
strongest winds aloft traverse southern New England predawn 
Thursday, which will limit the amount of wind that can mix down to 
the surface.

Thinking where overnight temperatures remain mild, across far 
southeastern Massachusetts, Cape Cod, and the Islands, there is the 
greatest chance for winds to mix down, with sub-advisory gusts of 30 
to 40 mph. However, if temperatures were to be a few degrees warmer 
overnight in this area, this could allow for slightly deeper mixing. 
Though with the nocturnal inversion overhead, it will be difficult 
to realize those stronger winds aloft and transport them down to the 
surface. Nevertheless, it's something to monitor.

Currently, we feel the greatest impacts will be for the marine 
community. Around the Cape and Islands are Gale Watches for the 
potential of those stronger winds. By Thursday afternoon, the 
surface cold front is offshore. However, temperatures aloft are 
slower to lower, so it will still be fairly seasonable Thursday 
afternoon. Then comes a reinforcement of colder air Thursday night, 
with 925 mb temperatures falling from around +20C Thursday to +10C 
Friday.

KEY MESSAGE 3...Full sun, seasonable temperatures and onshore 
breezes Friday into the weekend.

Still looking at a really nice stretch of weather for Friday into 
much of the weekend, with the weather across Southern New England 
being dominated by a sprawling high pressure cell coming in from 
Canada. Expect full sun, low humidity levels and dry weather for the 
daytime hours with good radiational cooling supporting some cool 
nights Friday through Saturday night. It still looks like Sunday 
could offer the next chance for cloud cover and some light showers 
developing Sunday night into early Monday but these also don't look 
capable of washouts. Highs Fri and Sat into the mid to upper 70s 
with low humidity levels, except low 70s near the eastern 
coastlines. By Sunday highs should top out in the mid 70s to low 80s 
despite increasing cloud cover.

&&

.AVIATION /00Z WEDNESDAY THROUGH SUNDAY/...
Forecaster Confidence Levels...

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

00Z TAF Update:

Tonight: High confidence, though moderate on wind direction at 
BOS.

BKN VFR ceilings through this period. For the eastern terminals,
winds are a light SE. There is some question after 07z at BOS if
they stay light SE through the Wed morning push, or if they 
flip to a light NW then come around to light N/NE between 
09-12z. Both scenarios have runway implications. Otherwise, 
remaining TAFs feature light northerly winds, becoming calm at
times. 

Wednesday: High confidence. 

VFR, multi-layered BKN/OVC VFR ceilings by afternoon. Winds turn
S/SW and increase to around 10-15 kt, with gusts to 25-30 kt.
Gusts on the higher end of that range more likely confined to
BOS and the Cape and Islands terminals. 

Wednesday Night: Moderate confidence.

VFR at least initially, though MVFR/VFR possible with spotty
SHRA as cold front slowly lurches southward. SW winds around
10-15 kt with gusts 25-35 kt, strongest Cape and Islands.

KBOS Terminal...High confidence in TAF. While wind speeds are
light, wind directions between 07-14z are uncertain: either
staying SE or turning light NW then light NE around 10-12z
before flipping to S by midmorning.

KBDL Terminal...High confidence in TAF.

Outlook /Wednesday Night through Sunday/...

Thursday: VFR. Strong winds with local gusts up to 40 kt.
Slight chance SHRA.

Thursday Night: VFR. Breezy. Slight chance SHRA.

Friday: VFR. 

Friday Night through Saturday Night: 

Sunday: Breezy. Slight chance SHRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Wednesday Night: High confidence. 

Winds and seas to remain below small craft advisory criterion 
tonight through Wednesday. Light E/SE winds tonight turn south and 
increase to around 10-15 kt early Wednesday, with S/SW winds 
increasing to around 20 kt Wednesday. Seas around 3 ft or less 
through Wednesday morning, but increase to around 4 ft offshore 
during the Wednesday daytime hours.

Looking at a period of gusty southwesterly winds Wednesday evening 
into Thursday ahead of a slow-moving frontal boundary. Gale Watches 
were maintained for the near-shore waters adjacent to Cape Cod where 
enough mixing near the land-sea interface could be enough to bump 
gusts into the borderline/marginal Gale range around 35 kt, but we 
have issued small craft advisories for the remaining nearshore and 
outer waters marine zones with SW gusts to 30 kt. Seas build to 
around 5-9 ft over the outer waters and 2-4 ft nearshore. 

Outlook /Wednesday Night through Sunday/...

Thursday: Moderate risk for Small Craft Advisory winds with
gusts up to 30 kt. Rough seas up to 10 ft. Slight chance of
rain showers. 

Thursday Night: Winds less than 25 kt. Local rough seas. Chance
of rain showers, slight chance of thunderstorms. 

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

Friday Night through Saturday Night: Winds less than 25 kt. 

Sunday: Winds less than 25 kt. Slight chance of rain showers.

&&

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

&&

$$

DISCUSSION...Loconto/Dooley
AVIATION...Loconto/Dooley
MARINE...Loconto/Dooley