Boscawen, New Hampshire Weather Forecast Discussion

164
FXUS61 KGYX 282252
AFDGYX
Area Forecast Discussion
National Weather Service Gray ME
652 PM EDT Sun Sep 28 2025
.SYNOPSIS...
High pressure remains over New England through early in the week
with dry weather and warm temperatures. A cold front moves
through Tuesday, allowing for much cooler and continued dry
weather for midweek with potential frost. Warmer conditions
return late in the week and next weekend as high pressure
remains in place.
&&
.NEAR TERM /UNTIL 6 AM MONDAY MORNING/...
650 PM Update...Cold front has passed through the region with
clear skies to follow overnight with diminishing winds. Valley
fog, mainly in the CT and Pemi Valleys is expected late. No
significant changes to the going forecast.
Previously...
It will get somewhat breezy this afternoon as a cold front
approaches and crosses the region this afternoon. Based on forecast
soundings, expected gusts mostly in the 20-25 mph range, possibly
up to 30 mph on occasion. Not expecting any precip with this
front as the atmosphere is quite dry, but it will bring a brief
increase in clouds with it, especially in northern areas. The
other story is the very warm temperatures. South of the mountains
should see highs in the low-mid 80s, and as of this writing,
PWM has gotten to 81 degrees, which is just 1 degree shy of
tying a daily record, which was 82 degrees from 1948.
Winds quickly diminish early this evening along with skies
clearing out behind the front as high pressure builds in
tonight. We should see good radiational cooling in most places
overnight with lows mostly in the 40s away from the immediate
coast, except mid-upper 30s in some northern valleys, where
patchy frost may also develop. More valley fog is also likely,
especially along the CT River.
&&
.SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/...
The high pressure that builds over the area tonight will sink to the
south on Monday as a backdoor cold front approaches from the north
and begins crossing through Monday night. Very dry air aloft will
bring plenty of sunshine during the day, but a slight uptick in
moisture along the front will create some increase in clouds late in
the day into Monday night, especially across the north. Southern
area may also see cirrus move in from the south Monday night.
While it won`t be quite as warm as today, Monday`s high are still
expected to be in the mid 70s to low 80s for most of the area as
there really isn`t much of an airmass change behind today`s front.
These warm temps are also expected toward the coast with the
westerly flow holding off or at least delaying the seabreeze. For
Monday night, winds will likely be light enough for radiational
cooling, but due to the possibility of clouds, I haven`t gone as
cold on temperatures yet, although I still have included valley
fog in some areas. This puts low in the 40s to lower 50s, but
temps in the upper 30s are possible across the north if skies
end up being clearer.
&&
.LONG TERM /TUESDAY THROUGH SUNDAY/...
Overview: A series of high pressure systems will persist over
New England through next weekend with little to no chance for
precipitation. Following a warmer than average Tuesday, cooler
conditions return for Wednesday and Thursday before a warming
trend begins late week through the upcoming weekend.
Impacts: Frost is possible Wednesday and Thursday night.
Otherwise, little to no weather related impacts other than
continued drought conditions.
Forecast Details: A sfc cold front will move across New England
on Tuesday morning but the cooler air will be trailing behind
this frontal boundary. Therefore, another day of well above
average temperatures can be expected, especially south of the
mtns where highs could approach the 70s to near 80 degrees.
Cooler temperatures will begin to filter in Tuesday night with
lows falling into the 30s across the north with 40s elsewhere
under clear skies.
Cooler and more seasonable temperatures then return on Wednesday
with highs ranging from the 50s across the north with lower to
middle 60s south. It will be a bit breezy due to the pressure
gradient between the high that will be across New England and
tropical cyclone Humberto, which will be passing over the open
North Atlantic. Northerly wind gusts up to 25 mph are therefore
possible. Clear skies and weakening winds on Wednesday night
will allow for radiational cooling with lows falling into the
upper 20s across the north with 30s to near 40 south and along
the coast. Thursday will be another cool day with highs into the
50s to near 60 degrees despite a plethora of sunshine. This will
be followed by another potentially frosty night with lows into
the 30s in most locations.
High pressure will begin to sink a bit to our south for the
remainder of the week and into the upcoming weekend, allowing
for increasing WAA southwesterly return flow and thus warmer
temperatures. Dry conditions look to persist for the foreseeable
future as well.
&&
.AVIATION /00Z MONDAY THROUGH FRIDAY/...
Short Term...Other than possible valley fog at LEB and HIE
tonight again Monday night, prevailing VFR is expected through
Monday night. Wind gusts may occasionally reach 20-25 kt this
afternoon as a cold front crosses.
Long Term...Other than nighttime valley FG most nights at KLEB
and KHIE, mainly VFR conditions will prevail through the period.
Northerly winds may gust up to around 20 kts on Wednesday but
otherwise winds should largely remain light through the period.
No LLWS is currently anticipated.
&&
.MARINE...
Short Term...SCA conditions are not expected. Winds diminish
through tonight as high pressure builds in. The high sinks south
on Monday as a backdoor front approaches from the north Monday
night.
Long Term...Seas across the offshore waters will increase to 4-6
ft on Tuesday and then further increase to 4-8 ft by Wednesday
as northerly wind gusts approach 30 kts. This will likely
require a small craft advisory. Winds and seas then look to
subside through the remainder of the period as high pressure
builds near or over the waters.
&&
.GYX WATCHES/WARNINGS/ADVISORIES...
ME...None.
NH...None.
MARINE...None.
&&
$$
SYNOPSIS...
NEAR TERM...Combs/Ekster
SHORT TERM...Combs
LONG TERM...Tubbs
AVIATION...
MARINE...

NWS GYX Office Area Forecast Discussion