Old Res Weather

Lexington, Massachusetts, USA

35°F

2/16/2025 7:17pm

Lexington Conditions: Clear
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 241059
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
659 AM EDT Fri Apr 24 2026

.WHAT HAS CHANGED...
No significant changes.

&&

.KEY MESSAGES...

- Mainly dry weather with cooler onshore flow today through the
  weekend, though some potential for light rain showers along 
  the South Coast on Sunday.

- High pressure with onshore flow continues into midweek, but
  temperatures start to modify closer to seasonable. Unsettled
  weather then develops around mid to late next week.

&&

.DISCUSSION...
KEY MESSAGE 1...Mainly dry weather with cooler onshore flow 
today through the weekend, though some potential for light rain 
showers along the South Coast on Sunday.

Southern New England is stuck in a rather blocky midlevel pattern, 
placed between a broad upper level circulation spiraling around the 
Canadian Maritimes and far northeastern Maine and an amplified ridge 
downstream of another closed circulation over the Canadian Rockies. 
Meanwhile dry surface high pressure continues to ridge southward 
from Quebec, associated with an extremely dry airmass (PWATs around 
0.2 to 0.4"). The circulation to our northeast is associated with an 
anomalously cool airmass, which will remain with us through the 
weekend with a period of onshore flow and seabreezes prevailing as 
well.

Early this morning a pretty extensive canopy of mid-level 
clouds roughly bisects Southern New England, leading to less 
clouds and cooler temps east (30s) and comparatively milder west
under the cloud deck (40s-low 50s). Radar's showing some echoes
here but they're not reaching the ground given dewpoint 
depressions of 20-25 degrees. This cloud cover should shunt 
itself southward through the mid morning hours, with full sun 
anticipated for today. Local seabreezes develop for the 
coastlines, and the airmass will remain quite dry but winds 
today will also be quite a bit weaker than yesterday. Highs 
could struggle to get to the low 50s before the onshore flow 
develops near the coasts, with full sun and 50s/low 60s inland. 

For the weekend...mid level clouds to overspread Southern New 
England again Saturday as a weak shortwave disturbance coming 
out of the Gt Lakes links up with subtle trough energy around 
the NE Canadian upper low. Some of the more coarser-resolution 
models try to shift some showers into western portions of MA and
CT Saturday, but this seems exaggerated; in fact most of the 
model- derived QPF is more restricted to SW CT/lower Hudson 
Valley Sat despite there being quite a bit of simulated 
reflectivity being modeled. Again a reflection of what should 
be quite a bit of midlevel clouds vs any precip. Onshore flow 
continues and the canopy of clouds could mean Sat ends up being 
quite a bit cool in the 40s to lower 50s. Though it's not well 
agreed upon, there's some indication that as low pressure 
develops south of Long Island Sunday morning that the surface 
ridge could weaken enough to allow for some showers to develop 
into southern RI and remaining sections of the South Coast with 
some enhanced NE winds; that might be the better chance for any 
showers but these will be on the light side. 

KEY MESSAGE 2...High pressure with onshore flow continues into 
midweek, but temperatures start to modify closer to seasonable. 
Unsettled weather then develops around mid to late next week.

Broad Canadian high pressure then reasserts itself back into 
Southern New England early to mid next week. Dry weather resumes
but our low-level temperatures modify, supporting temperatures 
closer to late- April normals, with continued onshore flow. It 
looks like the blocky weather pattern begins to break down 
around mid to late next week, which should bring with it better 
chances for rain showers, but uncertain at this range when those
showers would be more focused after several days of dry weather
preceding it.

&&

.AVIATION /12Z FRIDAY THROUGH TUESDAY/...
Forecaster Confidence Levels...

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

12z TAF Update: High confidence.

VFR through the period. For today, northerly winds 5-10 kt, with
sea-breezes developing around 14-16z eastern MA coast and south
coast 15-17z. Winds then turn E/ENE around 5-10 kt tonight into
Saturday, with an increasing canopy of VFR clouds through
Saturday.

KBOS Terminal...High confidence in TAF. Winds return to SE 
seabreezes around 14-15z. Winds then turn ENE early tonight with
possible SCT- BKN050 clouds. 

KBDL Terminal...High confidence in TAF. VFR, early-day midlevel
clouds trend to SKC by mid-morning with N to NE winds.

Outlook /Saturday Night through Tuesday/...

Saturday Night through Sunday Night: VFR. Slight chance SHRA.

Monday through Monday Night: VFR. Breezy. Slight chance SHRA.

Tuesday: Mainly VFR, with local MVFR possible. Chance SHRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

High confidence through this weekend.

Winds and seas remain below SCA levels through much of this
weekend, east/southeast winds through Saturday around 5-10 kt
and seas 4 ft or less. Possible fringe SCA conditions Saturday
night into Sunday on southern waters with enhanced NE winds and
seas nearing 5 ft as low pressure passes to our south.

Outlook /Saturday Night through Tuesday/...

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

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

Monday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Chance of rain showers. 

Monday Night through Tuesday: Winds less than 25 kt. Seas up to
5 ft. Slight chance of rain showers.

&&

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

&&

$$

DISCUSSION...Loconto
AVIATION...Loconto/BW
MARINE...Loconto