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 261103
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
703 AM EDT Mon Oct 26 2026

.WHAT HAS CHANGED...
No meaningful changes to the forecast, with an extended stretch of 
quiet and dry weather ahead.

&&

.KEY MESSAGES...

- Prolonged stretch of dry weather across southern New England,
  likely lasting through Halloween, with a potential transition
  toward unsettled weather in early November. Mild temperatures
  today, followed by a brief cooldown Tuesday and Wednesday
  before warmer weather returns late in the week. Temperatures
  trend closer to seasonable levels over the weekend.

&&

.DISCUSSION...
KEY MESSAGE 1...Prolonged stretch of dry weather across southern New 
England, likely lasting through Halloween, with a potential 
transition toward unsettled weather in early November. Mild 
temperatures today, followed by a brief cooldown Tuesday and 
Wednesday before warmer weather returns late in the week. 
Temperatures trend closer to seasonable levels over the weekend.

Nearly picture-perfect fall weather continues for the upcoming week 
across southern New England. Once again, the broken record is 
playing track one, titled "High Pressure." An extended stretch of 
dry weather is expected, with some day-to-day variability in 
temperatures, but otherwise not much excitement on the horizon. In 
fact, global ensembles paint a rather parched picture for southern 
New England, with cumulative probabilities of measurable 
precipitation (0.01 inches or greater) generally less than 10 
percent through All Hallows' Eve!

An expansive area of surface high pressure, around 1030 mb, 
continues to dominate the regional weather pattern, although its 
center has shifted slightly farther south toward the Mid-Atlantic 
compared to 24 hours ago. Nevertheless, this will promote plenty of 
sunshine, light winds, and generally quiet conditions. Two cold 
fronts will pass through the region this week, albeit moisture-
starved cold fronts. The first arrives tonight into early Tuesday, 
followed by a second Friday night into Saturday morning. However, 
persistent high pressure and dry air will likely limit these fronts 
to little more than some additional cloud cover, breezy conditions, 
and cooler air masses. The next opportunity for precipitation may 
arrive Sunday or Monday of next week, as global guidance hints at a 
transition toward a more active weather pattern during the first 
week of November.

In terms of temperatures, 925 mb temperatures warm to +14C today, 
supporting highs in the middle 60s to near 70F this afternoon. In 
the wake of the first moisture-starved cold front, Tuesday will be 
noticeably cooler, with 925 mb temperatures +1C to +4C. This should 
support afternoon temperatures roughly 10 to 15 degrees cooler than 
today, with highs in the lower to middle 50s.

Starting Wednesday, warm air advection aloft leads to a steady 
increase in temperatures through the remainder of the week, with 
Wednesday afternoon a few degrees warmer than Tuesday. Thursday and 
Friday look fairly mild considering the time of year, with highs 
returning to the middle 60s Thursday and upper 60s to potentially 
the lower 70s Friday! DESI probabilities of highs reaching 70F or 
greater Friday have increased significantly over the past 24 hours, 
from 30 to 50 percent yesterday to generally 60 to 80 percent or 
higher today, with lower probabilities along the coast and across 
higher terrain. Unfortunately, this warmth will be short-lived, as 
the second moisture-starved cold front passes through Friday night 
into Saturday morning, knocking temperatures back by around 10 
degrees. This should bring highs back into the upper 50s to lower 
60s over the weekend.

After a frosty weekend, overnight temperatures should trend closer 
to seasonable levels, generally in the upper 30s and 40s through 
much of the week. One exception may be Wednesday morning, when a 
cooler post-frontal air mass, combined with light winds and mainly 
clear skies, could allow for efficient radiational cooling and 
temperatures to fall back into the 20s and lower 30s. However, urban 
areas such as Boston will likely remain above freezing, with lows in 
the middle to upper 30s. Confidence in the colder temperatures 
Wednesday morning remains moderate given uncertainty regarding how 
effectively winds decouple overnight, which could limit radiational 
cooling. Be sure to protect those mums and Halloween pumpkins!

&&

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

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

12Z TAF Update:

Today through Tuesday...High confidence.

VFR conditions prevail through the period. Clear skies today with W 
winds of 6 to 12 kt. Across Cape Cod and the Islands, gusts of 17 to 
20 kt are possible beginning this afternoon. A moisture-starved cold 
front brings additional cloud cover tonight, with ceilings 
potentially lowering to 5-8 kft between 21Z and 09Z. During the 
frontal passage, winds shift from W to NNW/N, with speeds increasing 
to 8 to 14 kt. Gusts of 20 to 25 kt are possible across coastal 
areas, Cape Cod, and the Islands. Winds gradually subside after 18Z 
Tuesday, becoming light northerly and potentially calm Tuesday 
night. VFR conditions continue.

KBOS Terminal...High confidence.

KBDL Terminal...High confidence.

Outlook /Tuesday Night through Friday/...

Tuesday Night: VFR. Widespread frost.

Wednesday through Wednesday Night: VFR. 

Thursday: VFR. Breezy. 

Thursday Night: VFR. 

Friday: VFR. Breezy.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Tuesday...High confidence.

A broad area of high pressure situated south of New England across 
the Mid-Atlantic region brings dry weather and generally favorable 
marine conditions today. W winds of 10 to 15 kt are expected before 
a moisture-starved cold front brings a wind shift to the N 
overnight. Cold air advection over the waters will allow gusts to 
increase to 25 kt or greater across the eastern and southeastern 
waters late tonight into early Tuesday. Seas also briefly build to 3 
to 5 ft across the outer waters tonight into Tuesday. As a result, 
Small Craft Advisories remain in effect tonight into Tuesday for the 
aforementioned waters.

Outlook /Tuesday Night through Friday/...

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

Wednesday through Thursday: Winds less than 25 kt. 

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

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory from 2 AM to 11 AM EDT Tuesday for ANZ231-
     232-250-251-254-255.

&&

$$

DISCUSSION...Dooley
AVIATION...BW
MARINE...Dooley