Dover, New Hampshire Weather Forecast Discussion

946
FXUS61 KGYX 111726
AFDGYX
Area Forecast Discussion
National Weather Service Gray ME
126 PM EDT Thu Sep 11 2025
.SYNOPSIS...
High pressure will maintain dry conditions through the end of
the week with warm sunny days and cool nights with patchy frost
across the north. A weak system slides southeast out of Canada
Saturday night and Sunday bring slight chances for showers while
widespread wetting rainfall is unlikely. High pressure returns
Monday and will remain in control through the middle of next
week.
&&
.NEAR TERM /THROUGH TONIGHT/...
Winds briefly pick up the rest of today with gusts up to 20 mph
possible at times as a cold front moves through. This front
will bring some increase in clouds with it, but the atmosphere
is too dry aloft for any precipitation.
Winds diminish through tonight with skies becoming mostly clear as
Canadian high pressure starts to build overhead. Conditions look
good for radiational cooling, especially across the north where
temperatures are expected to drop into the 30s with frost in many
sheltered locations. The rest of the area should again see lows in
the 40s, but there may be enough of a breeze to keep some locations
across the south and the coast closer to 50 degrees. Valley fog
is again likely in northern valleys and along the CT River.
&&
.SHORT TERM /FRIDAY THROUGH FRIDAY NIGHT/...
High pressure further expands into New England on Friday and
Friday night. Once morning valley fog burns off, plenty of
sunshine is expected with light winds and temperatures in the
70-75F range across the region. Friday night will be another
cool tonight with valley fog in some areas, but mid and high
clouds may also hinder full cooling potential, depending on how
quickly it moves in. Lows will be mostly in the 40s, but upper
30s are possible in some northern valleys.
&&
.LONG TERM /SATURDAY THROUGH THURSDAY/...
The upper jet will largely remain north across Canada through the
long term period resulting in slow moving and poorly organized mid
level features over the CONUS. A splitting trough will cross Quebec
this weekend that will bring slight chances for showers Saturday
night into Sunday. Surface high pressure then builds in Monday and
likely keeps the forecast area dry through the middle of next week.
There will be more in the way of clouds Saturday as a trough moving
across Quebec will advect moisture into northern New England. During
the day the forecast area will likely remain precipitation free with
highs ranging from the upper 60s across the north to the mid 70s
across the south. Chances for showers will increase Saturday night
into Sunday. Forcing will be weak with the splitting trough so
appreciable rain is not expected with PoPs topping out at 20
percent. Highs on Sunday will generally be in the 70s.
High pressure builds in from the northwest Monday and will generally
hold over the Northeast through Wednesday. This will allow for warm
sunny days and cool nights. An upper low over the Southeast will
drift northward the second half of the week and may spread moisture
into the region while there is little to no signal for a widespread
wetting rain on the horizon.
&&
.AVIATION /17Z THURSDAY THROUGH MONDAY/...
Short Term...Prevailing VFR, except valley fog is again likely
at HIE and LEB tonight and Friday night. North to northwest
winds increase behind a dry cold front this afternoon and
evening with gusts 15-20 kt at times. Winds then diminish
through tonight and continue to be light Friday and Friday night
as high pressure builds in. Coastal sites will likely see winds
shift to onshore Friday afternoon with the seabreeze.
Long Term...Mainly VFR through the period. The exception will be
the potential for nighttime valley fog most nights that could
bring restrictions to KLEB and KHIE.
&&
.MARINE...
Short Term...A dry cold front crosses the waters this afternoon and
evening. SCA conditions are not expected, but a period of
N/NNE wind gusts of 20 to 25 kt is possible this evening through
tonight. High pressure builds overhead Friday into Friday night,
keeping winds and seas below SCA levels.
Long Term...Winds and seas will remain below SCA thresholds. A
weak system crossing southeast Canada will bring an increase in
south to southwest flow Saturday afternoon into Sunday while
gusts will only top out around 20 kts.
&&
.GYX WATCHES/WARNINGS/ADVISORIES...
ME...Frost Advisory from 2 AM to 8 AM EDT Friday for MEZ007>009.
NH...Frost Advisory from 2 AM to 8 AM EDT Friday for NHZ001-002.
MARINE...None.
&&
$$
NEAR TERM...Combs
SHORT TERM...Combs
LONG TERM...Schroeter

NWS GYX Office Area Forecast Discussion