Lexington Weather

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 100522
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
1222 AM EST Mon Nov 10 2025

.SYNOPSIS...
Rain with a few rumbles of thunder possible through early 
tonight. Fog and drizzle overnight behind main batch of rain. A
strong cold front moves through the area on Monday, with mild 
temperatures to start but then sharply falling through Monday 
afternoon. Breezy with below normal temperatures on Tuesday. 
Slight improvements in temperatures Wednesday before a 
reinforcing trough arrives later next week.

&&

.NEAR TERM /UNTIL 6 AM THIS MORNING/...
Key Messages: 

* Rain pushes northward into region late afternoon-early this
  evening. Few rumbles of thunder possible. 

* Overcast, generally dreary tonight with mist/drizzle after
  main batch of rain exits. 

Details...

SPC mesoanalysis shows the warm front pushing into the south coast and 
Cape/Islands. Radar shows showers moving northward across
southern New England with more widespread rain just offshore of
the south coast. Some with embedded convective showers/tstorms.
Showers are expected to increase over the next several hours 
from south to north as the warm front moves north. With this 
batch of rain, the highest coverage of showers will be across 
eastern southern New England. Marginal elevated instability will
accompany the front which has been shown in the latest 
mesoanalysis just south of the region. This favor convective 
showers with briefly higher rain rates and perhaps a rumble of 
thunder. This potential will be more favored across the south 
coast and southeast MA.

The surface low and warm front will continue to lift north into New 
England early tonight with flow becoming southerly on the backside. As 
the better forcing and deeper moisture exit, this will put an end to 
the rain/showers. Model soundings indicate drying in the layers aloft 
overnight; however, the warm/moist advection will keep the lower layer 
saturated favoring areas of drizzle as well as some fog. Temperatures 
tonight will stay on the mild side given the warm advection and clouds 
with temperatures staying in the 50s for many areas and upper 40s for 
northern MA and higher elevations.

&&

.SHORT TERM /6 AM THIS MORNING THROUGH 6 PM TUESDAY/...
Key Messages: 

* Overcast but a mild start to Monday morning with temps in the
  mid/upper 50s. 

* Strong cold front moves through from west to east this morning
  through late afternoon. Brings another round of rain ahead of
  front. 

* Sharply falling temperatures behind the front. Falling into
  20s/30s in western MA/CT by 10 PM. 

Details: 

Monday and Monday Night: 

The morning will start off mild, drizzly, overcast with the high 
temperatures of the day taking place (50s) and by early Tuesday morning 
temperatures will likely have dropped into the 20s and 30s. Quite a 
change! So what is to blame? An amplified trough will push eastward 
across the Great Lakes and mid-atlantic states on Monday, eventually 
pushing in cold temperatures behind a cold front. Models still appear 
to struggling with the timing of the front and how quickly temperatures 
crash behind it. A mean of high-resolution guidance moves the front 
through Monday morning/early PM across western southern New England and 
through eastern portions of southern New England in the afternoon/early 
evening. A line of showers/rain will move across ahead of the front. 
Behind the front/rain, conditions will improve as dry air aloft works 
in toward the evening. Temperatures continue to crash as a cold airmass 
works in with readings falling into the mid-upper 20s for most, with 
low 20s possible for the higher elevations even despite elevated west 
winds behind the front. Coastal areas fall into the 30s with breezier 
conditions (Gusts 20-30 mph). More wind to come Tuesday...

&&

.LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/...
Key Messages...

* Gusty, biting wind expected on Tuesday as high temperatures in the 
  upper 30s and low 40s will feel more like the upper 20s and low 
  30s. 

* A few lingering show showers possible over the Berkshires early 
  Tuesday. 

* Mostly dry and blustery at times Wed through Sun. 

Tuesday features much below normal temperatures with even colder 
wind chill values. This comes courtesy of a deep upper trough that 
digs into the northeast Tue-Wed the axis of which will be crossing 
SNE Tue. The unusually cold airmass which settles overhead (850 mb 
temps down to -10C) leads to temperatures not making it out of the 
upper 20s and low 30s in Tuesday's post frontal airmass. The cold 
advection pattern results in a very well mixed boundary layer, 
tapping into a 40-50 kt 850 mb jet; model soundings suggest we'll 
mix down widespread gusts 30 to 40 mph with potential for scattered 
gusts up to 45 mph. This will make temps feel more like the upper 
20s (high elevations) to low 30s. Tuesday is mostly dry as the 
column rapidly desaturated behind the front, but some 
orographically enhanced snow flurries/showers are possible 
especially the first half of the day with some low level 
moisture streaming off the Great Lakes. Expect a mix of clouds 
and sun. 

Wednesday through at least Friday we'll feel the influence of a 
lingering trough over the northeast keeping temperatures cooler than 
average generally in the upper 40s. A few weak disturbances round 
the trough leading mainly to some orographic rain/snow showers and 
ocean effect showers offshore, but the column remains largely dry 
which should prevent any widespread precipitation for the week and 
into the weekend as a brief ridge approaches around the weekend.

&&

.AVIATION /06Z MONDAY THROUGH FRIDAY/...
Forecaster Confidence Levels...

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

06Z TAF Update: 

Tonight: High confidence in trends but moderate on timing.

Continued IFR-LIFR ceilings with FG/BR and -DZ. Winds turn 
toward SE/S overnight possibly becoming light and variable
through the early morning.

Monday: Moderate confidence. 

IFR-LIFR to start. Another batch of rain moves through ahead of
the cold front generally from west to east. Rain likely arrives
10-12z across the western terminals and closer to 14-16 further
east. Frontal passage 15-22z with ceilings quickly improving 
behind it. Windshift to W around 10-12 kt with frontal passage. 

KBOS Terminal...Moderate confidence in TAF.
IFR/LIFR conditions through the rest of the night into the
morning hours. Another round of showers with slight improvements
in ceilings arrive 14-16z Monday. FROPA 20-22z with ceilings 
improving to MVFR behind it.


KBDL Terminal...Moderate confidence in TAF.

Outlook /Tuesday Night through Friday/... 

Veterans Day through Tuesday Night: VFR. Windy with gusts up to
35 kt. 

Wednesday: Mainly VFR, with areas MVFR possible. Windy with
areas of gusts up to 30 kt. Slight chance RA.

Wednesday Night through Thursday: Mainly VFR, with local MVFR
possible. Breezy. 

Thursday Night through Friday: VFR. Breezy.

&&

.MARINE...
Forecaster Confidence Levels...

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

Key Messages: 

* SCA winds/seas this afternoon/tonight. Showers on all waters
  this afternoon-evening, with low risk for thunder over the 
  south. Mist/fog could reduce visby on the waters tonight.

* Sharp cold front late in the day Monday. 

* Gale-force westerly gusts looking likely for Tue, perhaps 
  into early Wed.

SCAs continue into 12z Monday. Seas 4-6 ft offshore and winds
around 25 kts. Winds decrease after midnight, but seas for outer
water 3-5 ft. Rain through early tonight with possible mist/fog
and drizzle after main batch of rain moves out. Could reduce 
visbys on waters tonight.

Light SE to S winds early on Mon until frontal passage. 
Windshift to W Mon late aftn with gusts increasing into the SCA
to near-gale levels Mon night. Gale Watch has been issued for
that period. Should likely be upgraded to Gale Warning. 

Outlook /Tuesday Night through Friday/... 

Veterans Day: Moderate risk for gale force winds with gusts up
to 40 kt. Areas of rough seas. Slight chance of rain. 

Tuesday Night: Moderate risk for gale force winds with gusts up
to 40 kt. Rough seas up to 14 ft. 

Wednesday: Strong winds with gusts up to 35 kt. Rough seas up
to 13 ft. Slight chance of rain. 

Wednesday Night: Strong winds with gusts up to 35 kt. Areas of
rough seas. Slight chance of rain. 

Thursday: Moderate risk for Small Craft Advisory winds with
local gusts up to 30 kt. Areas of rough seas. Slight chance of
rain. 

Thursday Night: Moderate risk for Small Craft Advisory winds
with gusts up to 30 kt. Areas of rough seas. Slight chance of
rain. 

Friday: Low risk for Small Craft Advisory winds with gusts up
to 25 kt. Local rough seas. Slight chance of rain.

&&

.TIDES/COASTAL FLOODING...
Astronomical tides are still running high coming out of the full
moon from late in the week, but should continue to fall into
Monday. Continuing to monitor the high tides Monday morning at 
Nantucket for possible minor coastal flooding, with Stevens 
Institute supporting about a 1 ft storm surge. However, Stevens 
Institute guidance keeps means borderline minor flood stage for
Nantucket. The "reasonable worst case" indicates there is 
potential for Nantucket to reach minor flood stage Monday. Since
it is so borderline, we will hold off for now on any headlines,
but can't rule out a little splash over during the high tide
tomorrow.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 7 AM EST this morning for 
     ANZ230>235-237-250-251-254>256.
     Gale Watch from Tuesday morning through Wednesday morning for 
     ANZ231>235-237-250-251-254>256.

&&

$$

SYNOPSIS...BW/Mensch
NEAR TERM...Mensch
SHORT TERM...Mensch
LONG TERM...BW
AVIATION...FT
MARINE...BW/Mensch
TIDES/COASTAL FLOODING...Loconto/Mensch