Derry, New Hampshire 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

899
FXUS61 KGYX 111202
AFDGYX

Area Forecast Discussion
National Weather Service Gray ME
802 AM EDT Mon May 11 2026

.WHAT HAS CHANGED...
Frost Advisory this morning has been cancelled as temperatures
begin to rise for the day. Added a mention of sprinkles across
the north today to accompany isolated to scattered rain/snow
showers (depending on surface elevation).

&&

.KEY MESSAGES...
1. Winds turn more west northwest, followed by cooler and drier
conditions through midweek. Frost will be possible each morning
through Wednesday.

2. Low pressure dominates New England in the 2nd half of this
week, bring multiple days of potentially widespread steady rain
and showers through Friday.

&&

.DISCUSSION...
KEY MESSAGE 1 DESCRIPTION...

Other than a few more isolated showers through the day, it will
mainly be dry and cooler than yesterday. Highs should range from
upper 40s and lower 50s north, to the lower 60s south. Tonight
into Tuesday morning then looks to be another favorable night
for frost, and potentially even farther south. Thus, additional
headlines will likely be needed. Lows will range from the upper
20s north, to the mid/upper 30s south.

Dry weather then continues on Tuesday but it will be even a
touche cooler with highs in the mid/upper 40s north, to the
upper 50s/lower 60s south. Widespread frost is then once again
expected overnight Tuesday into Wednesday morning.

KEY MESSAGE 2 DESCRIPTION...

Little change to the going forecast at this time for midweek as
unsettled weather is expected for most of Wed through Fri.

On Wednesday and upper low and slow-moing attendant SFC low
pressure approaches from the west. Various members of guidance
are showing various degrees of amplification of the short wave
troughs and speed of the system as a whole. The mean solution
has conditions deteriorating conditions Wednesday afternoon in
light rain which continues through Thursday. In fact, moist
inflow and forcing for ascent may be enough for a period of
heavier rain and perhaps isold thunder during the day on
Thursday. The low pressure system basically stalls nearby on
Friday allowing for periods of showers and drizzle and perhaps
some fog along with colder than normal temperatures. The NBM is
too warm it seems. ECMWF two meter temperatures in the mid 50s
seems more reasonable.

The weekend looks to be drier for the moment but we`ll continue
to monitor as there is still some disagreement within the
various guidance solutions.

&&

.AVIATION /12Z MONDAY THROUGH FRIDAY/...
Through 12Z Tuesday...VFR expected through tonight. Westerly
wind gusts in the 15 to 20 knot range are possible this
afternoon before becoming light and variable tonight.

Outlook:

Tuesday: VFR expected.

Wednesday: AM VFR, MVFR in the afternoon due to rain.

Thursday and Friday: MVFR due to showers and possible isold
thunder. Areas of IFR possible as well, especially at the coast.

&&

.MARINE...
Winds shift offshore this morning. SCA continues through most of
today as swell builds due to passing offshore disturbance. This
could keep 4 to 6 ft waves towards the northern coastal waters
into this afternoon.

Southeast winds increase on Wednesday afternoon and may rise to
SCA levels later Wed afternoon through Thurs. Winds diminish
and flip to light northerlies by Friday morning, with seas
continuing to remain at 2-5 ft.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...None.
NH...None.
MARINE...Small Craft Advisory until 6 PM EDT this evening for ANZ150-
     152.

&&

$$

DISCUSSION...Cornwell/Ekster/Hargrove/Tubbs
AVIATION...Tubbs