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 041302
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
902 AM EDT Tue Aug 4 2026

.WHAT HAS CHANGED...
Forecast remains on track.

&&

.KEY MESSAGES...

- Dry and seasonable today, but summer heat and humidity returns
  Wed through the weekend. Diurnal scattered thunderstorms
  possible each day.

&&

.DISCUSSION...
KEY MESSAGE 1...Dry and seasonable today, but summer heat and 
humidity returns Wed through the weekend. Diurnal scattered 
thunderstorms possible each day.

A weak high pressure builds in today in the wake of a cold 
front, bringing clearing skies and dry weather with high 
temperatures in the low to mid 80s. Dew points begin to surge 
into the mid 70s Wednesday, peaking Thursday and Friday, and 
linger into the weekend as a Bermuda high builds in across the 
western Atlantic Ocean. Prolonged southerly flow will advect 
those warmer dew points into southern New England through the 
second half of the week, leading to near oppressive humidity at 
times. 925mb temperatures surge to near +22C each afternoon 
this week, leading to high temps 85-90 every day. Combined with 
dew points of 72-76, heat headlines are being considered through
the second half of the week and possibly into the weekend.

Regarding the thunderstorm potential later in the week... a few
weak, upper level disturbances passing through New England 
combining with the high heat/humidity and just enough 
instability will likely be enough to pop a few diurnal 
showers/thunderstorms each day Thursday through the weekend. 
PWATs anywhere from 1.75" to 2.10" will also provide enough 
potential for storms to be water loaded with torrential 
downpours.

&&

.AVIATION /13Z TUESDAY THROUGH SATURDAY/...
Forecaster Confidence Levels...

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

12z TAF Update:

Through Tonight: High Confidence. 

VFR. West winds 5-10 kts becoming SW after 18Z, with seabreezes
at BOS and PVD. Mid to high level cloud deck lingers along the 
Cape and Island terminals, dropping to MVFR late tonight after 
sunset.

Wednesday: Moderate Confidence.

Generally VFR with southwesterly flow. Chances for dirunal 
showers, but uncertain on where exactly they could pop.

KBOS Terminal...High confidence in TAF. 

VFR. W winds become SW this morning with potential for a late- 
day sea breeze. 

KBDL Terminal...High confidence in TAF.

Outlook /Wednesday Night through Saturday/...

Wednesday Night: VFR. 

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

Thursday Night: VFR. 

Friday: VFR. Breezy. Chance SHRA, chance TSRA.

Friday Night: VFR. Slight chance SHRA, slight chance TSRA.

Saturday: VFR. Breezy. Chance SHRA, chance TSRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

SCA's continue for the outer waters as seas slowly subside 
throughout the day. Winds generally below 10 kts, except a few 
gusts up to 18 kts possible across the northern waters later 
this afternoon. A Rip Current Statement remains in effect along 
the southern coastal and Island communities today as rough seas 
and longer period swells slowly subside.

Outlook /Wednesday Night through Saturday/...

Wednesday Night through Thursday Night: Winds less than 25 kt.
Areas of seas approaching 5 ft. 

Friday: Winds less than 25 kt. Seas up to 5 ft. 

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

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

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...High Risk for Rip Currents until 9 PM EDT this evening for MAZ020-
     023-024.
RI...High Risk for Rip Currents until 9 PM EDT this evening for 
     RIZ006>008.
MARINE...Small Craft Advisory until 2 PM EDT this afternoon for ANZ235-
     237-250-254.
     Small Craft Advisory until 8 PM EDT this evening for ANZ255-
     256.

&&

$$

DISCUSSION...McMinn
AVIATION...Loconto/McMinn
MARINE...McMinn