Plaistow, New Hampshire 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

821
FXUS61 KGYX 141253
AFDGYX

Area Forecast Discussion
National Weather Service Gray ME
853 AM EDT Sun Jun 14 2026

.WHAT HAS CHANGED...
In coordination with WFO Caribou, went ahead and issued a Flash
Flood Watch for the mountains and foothills of western ME and
NH. This will be in effect from this afternoon through early
Monday morning. Otherwise, no significant changes were made to
the forecast at this time.

The threat remains for isolated to scattered severe
thunderstorms this afternoon and evening. An axis of heavy
rainfall has also trended south towards the mountains for this
evening and tonight, increasing the chance for flash flooding. A
Coastal Flood Advisory has been issued for this evening`s high
tide for Portland through the NH Seacoast.

&&

.KEY MESSAGES...
1. A cold front will cross the region today and bring a
possibility for some strong to severe thunderstorms as the heat
breaks.

2. Expect high astronomical tides into early next week.

3. Seasonable temperatures return for much of the week. An
unsettled second half of the week is likely with multiple
rounds of precipitation in the forecast.

&&

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

Overall this has been little change to the severe weather threat
for the afternoon and early evening hours.

Parts of the area remain under a marginal or slight risk for
severe weather. Various available severe weather guidance,
including the HREF, CSU machine learning, and NCAR ensemble, all
support the need for those risk areas.

Most concerning will be any afternoon or evening convection,
along the warm front that is forecast to be hanging near the
Canadian border. Instability will be adequate, but the shear
profile is impressive, especially in the lower levels. Bulk
shear magnitude in the 0-3 km layer is forecast to be in excess
of 35 kt. That kind of magnitude can lead to a lot of potential
modes for severe weather. We will have to watch both for
supercellular structure and lines/segments which may contain
mesoscale circulations. Forecast hodographs continue to show
decent curvature and are sufficiently elongated that I think
the tornado threat remains non-zero. Otherwise wind remains the
primary hazard.

There may also be several rounds of strong to severe storms.
Various CAMs have early afternoon convection, followed by more
in the evening into the overnight. This will also add to the
rainfall totals. This is especially true where storm motion will
be largely parallel to the warm front for much of the day. Right
now CAMs are falling mainly in the 2 to 3 inch range, but
previous runs of the HREF supported the potential for 4 to 5
inches in parts of western and central Maine. Given the set up
that seems entirely within the realm of possibility. Across the
northern zones 3 hr flash flood guidance is around 2 inches, so
flash flooding cannot be ruled out either. We are expecting a
busy evening across the area, even if it that means babysitting
the radar to make sure convection is behaving itself.

it will also be the last of the hot days for a while,
especially away from the coast as southerly flow helps
temperatures to warm into the upper 80s to lower 90s. Along the
coast, the onshore flow will keep highs into the 70s to lower
80s. However with warm weather and generally fair conditions
near the coast until thunder arrives overnight, will issue
another Beach Hazard Statement for high paddlecraft risk,
especially in the bays.

KEY MESSAGE 2 DESCRIPTION...

High astronomical tides continue today and into Monday. The
evening tides are of greatest concern for Minor flooding, with
the best chance for these levels to be met for Portland and
Hampton this evening and Monday evening.

This evening`s tide will align with increasing southerly flow as
a front approaches from the west. This will result in growing
sea state, but wave heights of 2 to 4 ft remain more tame vs.
winter systems. A Coastal Flood Advisory has been issued for
Portland through the NH Seacoast for this evening`s tide after
9pm.

Subsequent tides will feature lower wave heights, but high still
water will still rise into action stage, and approach minor
flood stage.


KEY MESSAGE 3 DESCRIPTION...

Good model consensus remains for seasonable temps to return for
much of the week. Widespread 70s and 80s are anticipated during
the day and overnight dropping back into the 50s to lower 60s.
The humidity will start to creep back up towards the latter half
of the work week with the approach of the next chance of rain.

That will come as an upper-level low moves eastward across
Ontario and Quebec. This upper-level low will allow for cooler
temperatures and more unsettled weather. The first of three
disturbances arrives on Wednesday evening as a decaying low
brings scattered showers and storms. A more robust system then
looks to overspread the northeast on Thursday, with more
widespread rain in the morning followed by thunderstorms in the
evening. Some wraparound showers from the aforementioned low may
persist, with somewhat unsettled weather likely continuing
through the weekend. High temperatures are expected to be in the
upper 70s and lower 80s during this timeframe. Unsettled
weather may continue through the weekend.

&&

.AVIATION /12Z SUNDAY THROUGH THURSDAY/...
Through 12z Monday...Largely VFR conditions expected today.
Rounds of SHRA or TS for HIE, mostly staying north of LEB this
afternoon, before pushing east and becoming more widespread
tonight. MVFR or lower conditions will be possible in
showers/thunderstorms across the entire area overnight into Mon.
LLWS will also accompany this period tonight into early Mon
morning. MVFR begins to improve west to east early Mon, with VFR
expected.

Outlook:

Monday - Tuesday: VFR conditions expected during the day. Some
local valley fog possible in the vicinity of LEB and HIE at
night.

Wednesday: VFR likely, with a chance of MVFR due to showers.

Thursday: MVFR expected with rain and thunderstorms.

Friday: MVFR likely with wraparound showers.

&&

.MARINE...
Areas of fog remain possible in the vicinity of Penobscot Bay
this morning. Marginal SCA conditions still expected late
tonight into early Mon morning with some gusts near 25 kt and
seas building to 5 ft outside of the bays. Winds and seas
generally fall below SCA criteria through the first part of the
work week, but could return Thursday into Friday as a storm
system approaches.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...Flood Watch from 2 PM EDT this afternoon through Monday
     morning for MEZ007>009-012>014-033.
     Beach Hazards Statement until 8 PM EDT this evening for
     MEZ023>028.
     Coastal Flood Advisory from 9 PM this evening to 1 AM EDT
     Monday for MEZ023-024.
NH...Flood Watch from 2 PM EDT this afternoon through Monday
     morning for NHZ001>004.
     Beach Hazards Statement until 8 PM EDT this evening for NHZ014.
     Coastal Flood Advisory from 9 PM this evening to 1 AM EDT
     Monday for NHZ014.
MARINE...Small Craft Advisory from 4 PM this afternoon to 8 AM EDT
     Monday for ANZ150>154.

&&

$$

DISCUSSION...Tubbs/Cornwell/Legro/Palmer