Windham, New Hampshire 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

782
FXUS61 KGYX 100245
AFDGYX

Area Forecast Discussion
National Weather Service Gray ME
1045 PM EDT Mon Jun 9 2025

.SYNOPSIS...
Conditions become unsettled tonight with a chance of showers
along with fog and drizzle into Tuesday morning. Widespread
showers and isolated storms are expected during the day Tuesday
with drying conditions in the evening and overnight. Improving
conditions are then expected for the second half of the week,
with perhaps yet another unsettled Saturday in store.

&&

.NEAR TERM /THROUGH TONIGHT/...
1045 PM Update... Minor changes to align with
observations. Isolated showers continue to
stream into the area with patchy drizzle expanding in coverage
as well.

630 PM Update...Just minor changes to
temperature, dewpoint, and sky to align with observations.
Forecast remains in good shape with onshore flow contributing to
moisture advection ahead of the approaching warm front. Low
clouds and some drizzle are working into southern New Hampshire
at this hour and these are continue to be expected to advance
north and eastward overnight. Some broken lines of light showers
are also forming ahead of the main frontal boundary and moving
across the north and up to the Connecticut River Valley. Not
much guidance is latching on to these, but current PoPs are
advertising them well.

Previous Discussion...
Aside from a few light showers or sprinkles, mostly dry conditions
are expected for the rest of today with temperatures falling into
the 50s to low 60s by sunset. Downslope winds north of the White
may gusts 25-35 mph, but these should ease toward sunset. Going
into this evening and tonight, the low levels will saturate
with skies becoming cloudy with fog possible. There will also be
a chance of showers, but I think there will be more drizzle
than showers based on forecast soundings. Temperatures will
generally stay in the 50s overnight.

&&

.SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/...
A few showers are possible Tuesday morning with skies remaining low
overcast, but forecast soundings still depict most of the moisture
confined to the low levels, which would support precipitation
more in the form of drizzle with fog also sticking around.

The rest of the column saturates as an upper trough approaches, and
the increasing lift will bring widespread showers from the late
morning through the afternoon hours. Forecast soundings show the low
levels remaining mostly inverted, but steepening lapse rates aloft
will produce enough elevated CAPE that we could see some
thunderstorms. PWATs are also forecast to increase to above the 90th
percentile for this time of year (1.4-1.6") with warm cloud depths
around 11,000 ft, which suggests heavy downpours and efficient rain
rates with the instability also present. The HREF ensemble max is
hinting at high end amounts of 1-1.5" could be possible somewhere
over southern NH, but concerns for hydro issues are very low with
the system expected to be pretty progressive in nature.

Precipitation starts to taper off across western areas by late
afternoon or early evening and will continue to diminish from west
to east into the evening. Fog may develop after the rain ends
as flow looks pretty weak overnight.

Temperatures will be mostly in the 50s to 60s for highs Tuesday,
but if precipitation clears out a little faster, they may get
closer to 70 in NH.

&&

.LONG TERM /WEDNESDAY THROUGH MONDAY/...
Evening update...No significant changes with the latest long
range NBM incorporated. The pattern continues to favor unsettled
weather next week with uncertainty in the global models on
whether or not we will continue a streak of rainy weekends.

Previous Discussion...
Overview: The region will be between weather systems come Wednesday.
Dry but warmer conditions are forecast ahead of advancing upper low
across the northern Great Lakes and southern Canada. As this system
tracks east, shower chances increase mainly across the mountains Wed
evening and Thursday. Follow-up high pressure into late week and the
weekend will play a big role in precipitation chances.

Details: Midweek begins quiet but warm as temperatures rise into the
upper 70s to around 80. While the surface and aloft remains dry in
model profiles, a moist layer in between will be enough to generate
at least some diurnal clouds. These may be thicker towards the
foothills and mountains with some low moisture getting locked
upstream. Have kept shower chances here for the afternoon and the
evening as a pre-frontal trough advances eastward.

Thursday, upper low passes to the north with surface low
bringing a cold front across the forecast area. This again looks
to bring showers to the mountains, with limited extension into
the interior and coast. This front and incoming high pressure
will both play a role in precip chances late week into the
weekend.

High pressure will be passing north of the Great Lakes Friday, with
cold front settling south of the forecast area. Global ensembles and
deterministic runs depict weak disturbances with precip passing
along the slowing front, with northern high suppressing the activity
south. Recent data suggests this activity nudging northward,
potentially bringing another round of showers to at least the
southern half of the forecast area Friday into Saturday. While
initial guidance suggests spotty, non-uniform QPF...the orientation
of the slowing front and systems traveling along the boundary
becomes a focal point for forcing. Will need to monitor its
positioning and persistence for possible greater amounts.

&&

.AVIATION /03Z TUESDAY THROUGH SATURDAY/...
Short Term...Mainly VFR today. IFR to LIFR conditions are then
likely this evening through early Tuesday with low stratus, fog,
and drizzle. Some improvement is possible through the day
Tuesday, but restrictions still remain likely with widespread
showers and low stratus. Conditions then improve Tuesday
afternoon through Tuesday evening as showers end from west to
east. However, IFR to MVFR stratus may last after the rain ends,
and fog may also develop Tuesday night.

Long Term...VFR Wednesday. MVFR ceilings will be possible
Thursday north of the mountains, with breezy west winds. This
trends towards VFR overnight into Friday.

&&

.MARINE...
Short Term...Conditions are expected to remain below SCA levels
through Tuesday night. Winds will remain primarily out of the
east or northeast through tonight and early Tuesday as weak low
pressure develops south of the waters. During the day Tuesday,
winds could be variable at times as the weak low moves across
the waters, also bringing showers with it. The showers are
expected to end Tuesday evening into Tuesday night as the low
pressure moves off to the north and east with winds turning west
to southwesterly, but fog may linger into Tuesday night.

Long Term...A cold front will approach Thursday, bringing gusty
SW winds over the waters. A SCA may be needed as gusts rise to
around 25 kts and seas build to around 5 ft on the eastern
coastal waters. This front drapes across southern New England
into late week as high pressure tries to move into the region
for the weekend. There is some uncertainty how far south the
front advances, which could bring unsettled weather for a
portion of the waters.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...Air Quality Alert until midnight EDT tonight for MEZ023>025.
NH...None.
MARINE...None.

&&

$$

NEAR TERM...Baron/Combs
SHORT TERM...Combs
LONG TERM...Cornwell