Portsmouth, New Hampshire 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

193
FXUS61 KGYX 191259
AFDGYX

Area Forecast Discussion
National Weather Service Gray ME
859 AM EDT Thu Mar 19 2026

.WHAT HAS CHANGED...
Ocean effect snow between Brunswick and Wiscasset continues to
be going strong with reports of 1.5 inches so far. Have
increased PoPs and snowfall amounts for this localized area as
another inch or two seems possible based on radar trends.

&&

.KEY MESSAGES...
1. Besides ocean effect snow between Brunswick and Wiscasset
this morning, no significant weather impacts are expected
through Friday.


2. Two weak shortwaves will move through the northeast,
bringing rain and snow to northern New England.

&&

.DISCUSSION...
KEY MESSAGE 1 DESCRIPTION...
Partly to mostly cloudy skies will prevail today as an H5 s/wv
trof axis crosses New England. This trof will bring little in
the way of sensible weather impacts as both forcing for ascent
and moisture depth are quite limited but a stray flurry or
sprinkle cannot be ruled out. High temperatures will be a few
degrees warmer than yesterday with readings ranging from the 30s
across the north to 40s south.

Clouds will persist tonight with some clearing south of the
mountains late with low temperatures into the 20s. A few snow
showers are possible across the mountains and towards the
Canadian Border.

Clouds will increase from north to south on Friday as the next
s/wv trof axis quickly approaches the region. A few rain or snow
showers are possible late in the day from the mountains and
points north but most of the area will remain dry through the
daytime hours. High temperatures will range from the 40s and 50s
from north to south.

KEY MESSAGE 2 DESCRIPTION...Two weak shortwaves will move from
west to east across New England. The first will move into the
area Saturday morning, with mainly snow expected in the
mountains and north, with mostly rain expected along the coast.
Snow will be heavy and wet in character, though only 1-2 inches
are forecast at most where snow is expected. QPF will be light
with minimal impacts expected outside of some slick roads in the
interior.

Towards the end of the weekend, another shortwave moves across
the region in a similar track as the previous one. A lot of
model uncertainty exists with this system, with rain or snow
possible around Sunday afternoon.

&&

.AVIATION /12Z THURSDAY THROUGH MONDAY/...
Through 12Z Friday: VFR conditions are expected. An isolated
sprinkle or flurry is possible through 15Z this morning but
flight restrictions are not currently expected. Winds will be
out of the S-SE at 5-15 kts. VFR conditions persist for most
terminals tonight but some MVFR CIGS are possible at KHIE with
SHSN. Winds will be out of the S-SW at 5-10 kts. No LLWS is
anticipated through the period.

OUTLOOK:
Friday...VFR in the morning, with lower restrictions in the
afternoon due to rain and snow.

Saturday...IFR in the morning due to snow, return to VFR
expected south of the mountains.

Sunday...IFR expected due to rain and snow.

Monday...AM IFR, possible return to VFR by end of the day.

&&

.MARINE...
Seas continue to diminish and will remain below SCA criteria
through Friday. A few S gusts up to 20 kts are possible at times
though.

OUTLOOK:
Friday + Friday night...SCA southerly winds with sub-SCA seas.

Saturday...Sub-SCA northwesterly winds with SCA seas.

Sunday...Near-SCA variable winds, with SCA seas.

Monday...SCA northeasterly winds with SCA seas.

&&

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

&&

$$

DISCUSSION...Legro/Schroeter
AVIATION...Legro