Nashua, New Hampshire 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

092
FXUS61 KGYX 101958
AFDGYX

Area Forecast Discussion
National Weather Service Gray ME
358 PM EDT Tue Jun 10 2025

.SYNOPSIS...
Showers along with a few storms mostly end by this evening with
drying conditions through tonight. Improving, warmer conditions
are expected for the second half of the week, with perhaps yet
another unsettled Saturday in store.

&&

.NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
Mostly light rain showers will continue to push east across the
area the rest of this afternoon into early this evening. Could
see a few embedded heavier showers and maybe a rumble of thunder
or two within this activity, but these will be brief.

Looking upstream, satellite is showing some thinning of the
clouds along the CT River and partial clearing just to the west
of that. This will bring a little more instability and better
chances for thunderstorms and heavy downpours. Will have to
watch the activity currently over southern VT to see how far
eastward it can progress, but the HRRR is advertising a
convective line trying to push into the CT River Valley from the
west in the 7 to 9 PM time frame. Given the time of day, this
would be expected to be on a weakening trend, but there may be
heavy downpours and possibly small hail in a more robust
updraft.

Showers will largely end this evening, but saturated low levels
could still result in drizzle in some areas into the early
overnight hours as well as patchy fog. The low clouds are
expected to clear out from west to night overnight, and
additional fog may develop as winds will be light.

&&

.SHORT TERM /6 AM WEDNESDAY MORNING THROUGH WEDNESDAY NIGHT/...
Drier and warmer conditions are expected on Wednesday with high
temperatures ranging from the upper 70s to mid 80s. The 500mb
pattern continues to show broad troughing over eastern Canada, which
will open the door to a couple of weak waves crossing through, but
significant dry air aloft will make showers hard to come by, except
the chances are higher in the mountains and CT River Valley where
moisture is a little more favorable.

For areas to the south of the mountains, there will be good mixing
and steep low-level lapse rates to support gusts of 20-25 mph,
perhaps up to 30 mph on occasion. Again while generally not
supportive of showers, there will be enough moisture for a cu field,
and with the steep low-level lapse rates generating 100-200 J/kg of
MUCAPE, I do think there will be periods of mostly cloudy skies.

The second wave will start pushing a cold front through Wednesday
night, but again any showers will stay mostly in the mountains.
Overnight temperatures will be in the 50s to lower 60s.

&&

.LONG TERM /THURSDAY THROUGH TUESDAY/...
Breezy and remaining warm Thursday as a weak cold front passes
off the coast by evening. While the front passes well off the
coast at this latitude, it will tend to remain stationary below
southern New England. This continues to be a focus of unsettled
conditions into late week as high pressure looks to pass to the
north.

Quicker moving high pressure means the potential for aided return
flow come Friday night and Saturday. While earlier trends supported
this high suppressing southerly moisture, the split high now
reinforces IVT into northern New England to start the weekend. Thus
increased rain chances on Saturday. Overall zonal pattern aloft
remains with a strong jet, so passing disturbances are progressive.
Deeper southerly 700mb flow fails to materialize and larger values
of QPF look to be off the table for now.

Remainder of the high built north of the Great Lakes looks to shift
east Sunday. This would bring drier air with it and lesser chances
for rain. Unsettled weather could return as this high exits and
return flow allows moisture back into a period between systems early
next week.

&&

.AVIATION /20Z TUESDAY THROUGH SUNDAY/...
Short Term...Precipitation will continue to diminish into this evening, but
additional showers will be possible into New Hampshire toward 00Z as
the cold front approaches. As far as ceilings, IFR to LIFR stratus
will stick around at most places into this evening but improvement
is expected overnight from west to east, but fog may again
redevelop. Mainly VFR Wednesday into Wednesday night with a few
showers possible, mainly in the LEB-HIE corridor.

Long Term...VFR Thursday with some lingering MVFR ceilings near
the CAN/US border in the morning. West winds become gusty during
the day up to 20 kt. These subside overnight. Ceilings likely
thicken and lower Friday night into Saturday with -RA.

&&

.MARINE...
Short Term...Showers and fog will precede a cold front over the
waters into the early part of tonight, but then fog should
gradually diminish over the waters overnight with drier air and
west to southwest winds behind the boundary. Winds stay south to
southwest Wednesday while remaining below SCA levels through at
least the morning, but may increase to SCA levels Wednesday
afternoon through Wednesday night as another front approaches.


Long Term...5 ft waves may still be over the eastern coastal
waters Thursday, but a general trend down is anticipated into
the evening as a cold front pushes off the coast. Conditions
then remain below SCA into the weekend. High pressure passes to
the north, but may not be strong enough to keep rain suppressed
to the south.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...None.
NH...None.
MARINE...None.

&&

$$


NEAR TERM...Combs
SHORT TERM...Combs
LONG TERM...Cornwell