Hopkinton, New Hampshire Weather Forecast Discussion

374
FXUS61 KGYX 290502
AFDGYX
Area Forecast Discussion
National Weather Service Gray ME
102 AM EDT Mon Sep 29 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 /THROUGH TODAY/...
High pressure brings another warm and sunny day to northern New
England today. Yesterday`s weak cold front brings in drier air
for today, but temperatures still rise into the upper 70s to low
80s in most spots. Mid 70s are expected across the north, as
well as along the MidCoast where a seabreeze keeps temps down a
bit today.
&&
.SHORT TERM /TONIGHT THROUGH TUESDAY/...
A cold front moves through during the overnight hours tonight.
Any isolated showers likely dry up before they reach the
Canadian border, with the dry frontal passage occuring
overnight. At the same time, high clouds associated with
moisture from Tropical Storm Imelda stream into southern
locations through the overnight hours. These clouds shouldn`t
prevent much in the way of radiational cooling as lows drop into
the 40s across the interior, and low to mid 50s along the coast
and Southeast New Hampshire.
Tomorrow will feature a change of airmasses behind the cold
front. Much drier air moves in through the daytime as dew points
drop into the 30s. Cooler air will also arrive during the
daytime across the north where highs top out in the low to mid
60s. South of the mountains, a downsloping wind direction warms
temps into the mid 70s in most spots with mostly sunny skies.
These conditions will bring an increasing fire weather threat
as fine fuels dry through the daytime.
&&
.LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/...
Early morning long term update...Very little change to the going
forecast as 01z NBM and various other ensembles/deterministics
remain dry through the period. Much cooler air arrives Tue night
with frost possible far north. Wed and Thu nights will have a
good chance of frost away from urban centers and the immediate
coast. Wed night will be the coldest night with a freeze likely
in our mountain and some foothill zones. No meaningful rainfall
is expected within the next 7-10 days, possibly longer, so we
expect the drought to worsen with RH values/fuel moisture
conducive for wildfire spread although winds not forecast to be
particularly gusty after Wednesday.
Previously...
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: 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 /01Z MONDAY THROUGH FRIDAY/...
Short Term...VFR prevails during the daytime today and
tomorrow. Valley fog with LIFR conditions are likely through mid
morning today, and then again tonight at LEB. Valley fog is
also possible at HIE and CON late tonight. VFR prevails
elsewhere.
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...Fair conditions continue with high pressure in
place across the waters today. A cold front crosses the waters
late tonight, with high pressure building in during the daytime
tomorrow. A south- southeasterly swell builds during the daytime
tomorrow, with SCA conditions possible with a 5ft swell
possible by late tomorrow afternoon.
Long Term...SCA conditions possible Wed and Wed night as high
pressure builds in. These conditions subside on Thu.
&&
.GYX WATCHES/WARNINGS/ADVISORIES...
ME...None.
NH...None.
MARINE...None.
&&
$$
NEAR TERM...Clair
SHORT TERM...Clair
LONG TERM...Ekster/Tubbs

NWS GYX Office Area Forecast Discussion