Old Res Weather

Lexington, Massachusetts, USA

35°F

2/16/2025 7:17pm

Lexington Conditions: Mostly 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

Southeast Middlesex County, MA - Heat Advisory
- SEE ALL NEARBY ALERTS -

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 081839
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
239 PM EDT Mon Jun 8 2026

.WHAT HAS CHANGED...

No significant forecast changes.

&&

.KEY MESSAGES...

- Pleasant weather continues on Tuesday with mostly sunny skies
  but warmer high temperatures well into the 80s.

- Summer like heat remains in place through the weekend with 
  changes for diurnal thunderstorms Wednesday through Friday.

&&

.DISCUSSION...

KEY MESSAGE 1...Pleasant weather continues on Tuesday with mostly 
sunny skies but warmer high temperatures well into the 80s.

High pressure just off the mid-Atlantic coast will continue to 
slowly sink further south through Tuesday night. This will result in 
the continuation of dry and pleasant weather on Tuesday...but with 
warmer temperatures.

Mainly clear skies with light/calm winds tonight will result in good 
radiational cooling conditions and comfortable temperatures. Low 
temps tonight will range from the upper 40s in the normally coolest 
outlying locations...to the lower to middle 50s in most other 
locations. The mild spot will be the urban heat island of Boston 
with lows only dropping to near 60 as southwest winds begin to mix 
milder temps aloft.

Plenty of sunshine on Tuesday with a warmer southwest flow of air 
working into the region. This should push high temps well into the 
80s in most locations...except 70s near the immediate south coast 
with a modified marine airmass given gusty SW winds. 
Otherwise...dewpoints will be low on Tuesday so humidity levels will 
remain quite comfortable despite the warm temperatures. 

Dry and pleasant weather continues Tuesday night with low temps 
mainly in the middle 50s to the lower 60s. 

KEY MESSAGE 2...Summer like heat remains in place through the 
weekend with changes for diurnal thunderstorms Wednesday through
Friday.

High pressure positioned off the East Coast will continue to support 
a stretch of warm, summer-like weather across southern New England 
from Wednesday through the weekend. Temperatures several thousand 
feet above the surface will remain quite warm, favoring afternoon 
highs ranging from the mid 80s to lower 90s each day. Coastal 
locations will be cooler given the proximity to the ocean.

In addition to the warmth, a humid air mass will remain in place 
from Wednesday through Friday, with dew points generally in the mid 
to upper 60s and locally near 70 degrees. This combination of heat 
and humidity will create enough instability for scattered afternoon 
showers and thunderstorms to develop. Several weak disturbances 
moving through the flow aloft may help trigger this activity, 
particularly during the afternoon and evening hours.

At this time, there are no strong indications of a widespread severe 
weather event. The ingredients typically associated with organized 
severe thunderstormsincluding strong forcing, abundant instability, 
and stronger wind shear appear somewhat limited. That said, a few 
stronger storms cannot be ruled out. Current CSU machine-learning 
guidance indicates a 5 to 15 percent probability of severe weather 
Thursday into Friday, with slightly higher probabilities of 15 to 30 
percent across portions of Connecticut. Forecast confidence 
regarding thunderstorm coverage and intensity should improve as 
higher-resolution guidance becomes available over the next couple of 
days.

Heat and humidity will also pose a risk, especially on Thursday when 
heat index values may approach 100 degrees in parts of the 
Connecticut River Valley. These values are associated with moderate 
to major heat impacts, increasing the risk of heat-related illness 
for anyone spending extended time outdoors without adequate 
hydration or access to cooling. Confidence remains too low at this 
time to determine whether heat headlines will be needed, but they 
may become necessary if confidence increases in heat index values 
exceeding 100 degrees.

By the weekend, a mid-level ridge is expected to strengthen over 
southern New England, promoting rising heights aloft and a somewhat 
drier air mass. While temperatures will remain quite warm, dew 
points should fall back into the 50s, resulting in noticeably more 
comfortable conditions and a reduced risk of afternoon
thunderstorms.

&&

.AVIATION /18Z MONDAY THROUGH SATURDAY/...

Forecaster Confidence Levels...

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

18z TAF Update...

Tonight through Tuesday night...High confidence.

VFR conditions continue through Tuesday night. Winds shift to a SW 
direction with some 20-25 knot gusts during the day 
Tuesday...strongest of which towards the south coast and upper Cape.

KBOS Terminal...High confidence. Sea breeze should depart between 
23z and 01z. 

KBDL Terminal...High confidence.

Outlook /Wednesday through Saturday/...

Wednesday: Mainly VFR, with local MVFR possible. Breezy. Chance
SHRA, slight chance TSRA.

Wednesday Night: Mainly VFR, with areas IFR possible. Breezy.
SHRA likely, slight chance TSRA.

Thursday: Mainly VFR, with local MVFR possible. Chance SHRA,
chance TSRA.

Thursday Night: Mainly VFR, with local MVFR possible. Chance
SHRA.

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

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

Saturday: VFR. Slight chance SHRA.

&&

.MARINE...

Forecaster Confidence Levels...

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

Tonight through Tuesday night...High confidence.

High pressure centered across the mid-Atlantic states will continue 
to slowly sink southward through Tuesday night. This will shift the 
winds to a SW direction tonight. Good mixing over the land should 
yield SW wind gusts around 25 knots across our nearshore southern 
waters Tuesday afternoon. Therefore...we have hoisted small craft 
headlines for these locations. The rest of the region should 
generally remain below small craft advisory criteria through Tuesday 
night. 

Outlook /Wednesday through Saturday/...

Wednesday: Low risk for Small Craft Advisory winds with gusts
up to 25 kt. Seas up to 5 ft. Chance of rain showers. 

Wednesday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas up to 5 ft. Rain showers, slight chance
of thunderstorms. 

Thursday: Winds less than 25 kt. Areas of rough seas. Chance of
rain showers. 

Thursday Night: Winds less than 25 kt. Seas up to 5 ft. Chance
of rain showers. 

Friday: Winds less than 25 kt. Seas locally approaching 5 ft. 

Friday Night through Saturday: Winds less than 25 kt. Slight
chance of rain showers. 

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...High Risk for Rip Currents until 10 PM EDT this evening for MAZ022-
     024.
RI...None.
MARINE...Small Craft Advisory from 10 AM to 7 PM EDT Tuesday for 
     ANZ231>236.

&&

$$

DISCUSSION...Frank/RM
AVIATION...Frank/RM
MARINE...Frank/RM