Windham, New Hampshire 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

188
FXUS61 KGYX 131729
AFDGYX

Area Forecast Discussion
National Weather Service Gray ME
1229 PM EST Tue Jan 13 2026

.WHAT HAS CHANGED...

The forecast has trended drier but breezier for Thursday night
into Friday. Otherwise, little changes were needed for this
forecast package update.

&&

.KEY MESSAGES...
1. Above normal temperatures continue through midweek across all of
New Hampshire and western Maine, especially Wednesday when forecast
highs are mainly in the 40s.

2. A weak disturbance will lead to increasing light precipitation
chances tonight. Snow is likely over the mountains, portions of the
foothills, and central New Hampshire while mainly rain is expected
across the Interior, coastal Maine, and southern New Hampshire.

3. Low pressure brings a mix of rain and snow to the area
Wednesday evening into Thursday. Amounts will be light, but
slick travel is possible across northern NH and the western ME
mountains, where precipitation type is expected to be mostly
snow.

4. Below normal temperatures likely Friday through early next
week with multiple chances for light snow, but significant
precipitation and impacts are not expected at this time. Winds
chills below zero are possible for much of the area early Friday
morning.

&&

.DISCUSSION...

KEY MESSAGE 1 DESCRIPTION...

A ridge axis will continue to move across the region today and we
transition back into southwest flow aloft by later this afternoon or
this evening. This pattern will continue leading to above normal
temperatures for this time of year through midweek. Today`s highs
will mainly range from the lower 30s to the lower 40s. Lows tonight
will range from mid 20s to the mid 30s. Wednesday should then be the
warmest day of the forecast period as we remain in persistent
southerly flow at the surface and aloft. Nearly everyone outside of
the mountains should see highs in the 40s.

KEY MESSAGE 2 DESCRIPTION...

As a mean longwave trough to our west continues to slowly nudge
closer, a surface low will deepen near the border of southern
Ontario/Quebec this evening. A cold front will extend to the
southwest of this low, a surface trough to the south, and a warm
front will be draped to the east southeast. The initial push of
broad precipitation this evening will likely be associated with the
warm front as it lifts north across New Hampshire and western Maine.
CAMs then suggest we could see a little bit more precipitation as
the surface trough moves through, but this activity appears to be
more spotty as the best upper forcing support moves out to the
north. Snow will be the most likely precipitation type across the
mountains and into portions of the foothills/central New Hampshire.
Rain will be most likely across the Interior, coastal Maine, and
southern New Hampshire. The fringes of these regions may see a
rain/snow mix at times. All that said, precipitation amounts tonight
appear fairly light with liquid QPF amounts likely only maxing out
around a few hundredths of an inch or so. A fresh dusting of snow to
an inch or two will be possible over the higher terrain.

As the initial shortwave moves off into the Canadian Maritimes, the
mean longwave trough continues to push east. We could see a few
showers lingering through the day on Wednesday but the stronger wave
will not approach until late in the day.

KEY MESSAGE 3 DESCRIPTION...

An upper-low approaches and crosses the Great Lakes Wednesday night
into Thursday while a surface low develops and lifts northward
across Maine. Precipitation is likely across most of the area
beginning Wednesday evening and continuing through the first
part of Thursday as lift increases from the approach of the
upper low and WAA. Temperature profiles support mostly snow
across northern NH and the western ME mountains (where slippery
travel is possible) and mostly rain to the south, although snow
could mix in at times Wednesday night. As the surface low
begins to lift into northern ME on Thursday, the westerly flow
on the backside will begin pulling in drier and colder air, but
it`s possible that there is a switch to snow from the foothills
southward before precipitation tapers off Thursday afternoon.
Across the mountains, snow may last into Thursday evening with
total snow accumulations of a few inches possible.

Winds become breezy in the afternoon and evening with gusts of 20-30
mph as temps continue to fall.  This will bring an extra chill to
the air with wind chills in the single digits possible by Thursday
evening.

KEY MESSAGE 4 DESCRIPTION...

Colder and drier air continues to spill into the area Thursday night
and into Friday morning with winds remaining breezy. Based on the
latest wind and temperature forecast, winds chills look to be below
zero for much of the area to start out Friday morning and possibly
in the -10F to -20F range in the mountains. Winds will ease going
into the afternoon as high pressure begins to build overhead to
relax the gradient, but highs will be limited to 20s for much of the
area and even 10s in the mountains.

Weak disturbances will bring a low chance of snow showers (20%)
Friday night and Saturday, but most will stay dry during this time.
For the rest of the weekend and into early next week, longwave
troughing will engulf the eastern half of the CONUS favoring below
normal temperatures. Even colder air may be lurking just beyond the
forecast period toward the middle of next week. This longwave
troughing also keeps the weather pattern active with several
shortwaves crossing through the region, bringing multiple chances
for snowfall. However, most of the ensemble guidance favors light
amounts with little to no signal for significant precipitation at
this time. Also, it`s difficult to time these shortwaves, and the
broad brush low PoPs of 20-30% from the NBM probably reflect the
uncertainty in that.

&&

.AVIATION /18Z TUESDAY THROUGH SUNDAY/...

Through 18Z Wednesday...VFR conditions are generally expected at
all terminals through this afternoon with some lower VFR
ceilings at HIE and LEB. The next precipitation maker approaches
this evening which could lead to some more MVFR to IFR
conditions in snow showers across the mountains (mainly
impacting HIE and possibly LEB). Outside of the mountains,
precipitation will mainly be rain or a rain/snow mix. A brief
MVFR visibility restriction is not out of the question.
Restrictions could linger in the mountains through the day on
Wednesday. Finally, some enhanced low-level wind shear will be
possible tonight with the best chances mainly over New Hampshire
terminals.

Outlook:

Wednesday night and Thursday: MVFR to IFR restrictions possible.
HIE and LEB expected to see light snow while other terminals are
expected to see mostly rain, possibly mixed with light snow at
times. Winds may gusts up to 25 kt out of the west Thursday
afternoon and evening.

Thursday night through Saturday: Mostly VFR, but a low (20%) chance
of snow showers Fri night into Saturday may cause brief restrictions.

Saturday night and Sunday: Light snow with IFR to MVFR restrictions
possible.

&&

.MARINE...

Today-Wednesday...After a brief break, SCA conditions return tonight
as low pressure crosses through the Gulf of Maine. SCA conditions
will then continue through the day on Wednesday, likely
lingering into the evening.

Thurs-Tues...SCA conditions appear likely Wednesday night and
Thursday as low pressure lifts northward across Maine and deepens as
it approaches the Canadian Maritimes by Thursday night. The west to
southwest flow may see gusts to gale force late Thursday into
Thursday night. SCA conditions continue into Friday but may briefly
fall below criteria as high pressure briefly builds in. Additional
periods of SCA conditions are likely over the weekend into early
next week as multiple low pressures/fronts approach and cross
through New England.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...None.
NH...None.
MARINE...Small Craft Advisory from 6 PM this evening to 10 PM EST
     Wednesday for ANZ150-152-154.
     Small Craft Advisory from 10 PM this evening to 1 PM EST
     Wednesday for ANZ151-153.

&&

$$

DISCUSSION...Hargrove/Combs
AVIATION...Hargrove/Combs
MARINE...Hargrove/Combs