Old Orchard, Maine 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

898
FXUS61 KGYX 100555
AFDGYX

Area Forecast Discussion
National Weather Service Gray ME
155 AM EDT Sun Aug 10 2025

.SYNOPSIS...
High pressure is in control for the next several days.
Temperatures and humidity continue to rise through the first
half of this week as a ridge of high pressure builds over the
Northeast. The ridge starts to break down mid week that will
allow for some chances of showers and thunderstorms as a cold
front approaches.

&&

.NEAR TERM /TODAY/...

Satellite imagery depicts mostly clear skies at the moment with
some cirrus moving in from the north and east. Still expecting
valley fog to develop over the next few hours in some areas, and
guidance is also advertising fog (maybe dense) from the
Midcoast toward the Augusta area.

Aside from the early morning fog, today is the start of a
stretch of hot weather. Currently, the axis of a 500mb ridge is
just west of the area, but it will gradually expand over New
England by this afternoon. Enough low- level moisture will be
present for some diurnal cumulus to develop, but increasing
subsidence from the ridge will make any shower development few
and far between...but probably in the mountains if anywhere.
850mb temperatures of +16C to +18C should yield high
temperatures in the upper 80s to low 90s away from the coast.
The Midcoast will be the cooler area today with the south to
southwest flow off the Gulf of Maine, potentially keeping
temperatures in the 70s along the immediate coastline. The
seabreeze will also move inland through the the afternoon,
offering some relief by bringing temps down a bit.

&&

.SHORT TERM /TONIGHT THROUGH MONDAY/...
Like the last few nights, light winds and mostly clear skies tonight
will promote radiational cooling with valley fog again likely
in some areas and possibly toward the Midcoast as
well. Temperatures will generally range from the mid 50s to
lower 60s.

The 500mb ridge remains full established over New England on Monday,
bringing another hot day with mostly sunny skies. Temperatures
are expected to be a couple of degrees higher than those of
today with 850mb temps of +18C to +20C supporting highs of
90-95F for most locations away from the coast, and dewpoints may
be high enough to bring heat indices above 95F for a few hours.
However, with it being marginal will let the day shift take
another look at a potential Heat Advisory. Can`t rule out a
couple of showers in the mountains, but these will be very
isolated.

&&

.LONG TERM /MONDAY NIGHT THROUGH SATURDAY/...
Early morning long term update...01z NBM has been incorporated
into the forecast and yields little change from the going
forecast. The main theme continues to be heat Tuesday and
Wednesday with a potential cooling trend thereafter. Very low
chance of an airmass shower or thunderstorm Tuesday, and
somewhat better chances for scattered showers and thunderstorms
Wed and Thu. However until then we expected continued dry
weather.

Previously...

Key Messages:
* Hot temperatures remain likely this coming week. Duration of
  daytime highs in the upper 80s to lower 90s will be the
  biggest impact, with 3 to 4 days possible. Heat Advisory will
  likely be needed for a portion of the forecast area.
* Slight chance for an afternoon shower or thunderstorm Tues.

Details: Global ensembles continue to bring hot temperatures
into the region early this week into midweek. High pressure over
the East Coast will aid in advecting much of these warm values
across the eastern CONUS and into interior New England.
Deterministic solutions keep 850mp temps 18-20 C during the
daytime, and this will roughly translate to highs in the upper
80s to lower 90s across a good portion of the area. Focus will
be on the interior and foothills where daytime heating and
mostly sunny skies through the morning should lead to rapid
warming during these hours. EFI is still showing a good signal
for well above normal temps, notable towards the US/CAN border
mountains where even here highs around 90 will be attainable.

Tuesday and Wednesday will be hot, but there remains
uncertainty on incoming cold front timing which will play a role
in area temps.

Very weak winds in the boundary layer will limit how much dry
air is mixed to surface. While NBM tends to run warm for its
dewpoint forecast, have kept values as-is for the moment due to
the lack of better mixing. With these weak background winds,
daily seabreeze should start to propagate inland during the
early afternoons. This would assist in immediate coastal
locations remaining a couple degrees lower than points just a
few miles inland.

Temperatures decrease behind cold front that passes in the
Wednesday-Thursday timeframe. Highs into the end of the week
remain in the upper 70s to mid 80s for the area.

&&

.AVIATION /02Z SUNDAY THROUGH THURSDAY/...
Short Term...Fog remains likely at LEB this morning and perhaps
RKD and HIE, but this will clear out by 12-13Z like the last
few days. Otherwise, primarily VFR today, but fog is again
likely at LEB tonight and possibly RKD and HIE through 12-13Z
Monday. VFR the rest of Monday.

Long Term...VFR conditions look to prevail, but there will be
the chance for some restrictions due to coastal and valley fog.
This appears most likely during the overnight and early morning
hours. Weak winds in the low levels present little risk of LLWS
development, with wind shifts expected around daily sea breeze
fronts.

&&

.MARINE...
Short Term...SCA conditions are not expected. Southwest flow
will back more to the S/SSE this afternoon with the seabreeze
before returning to southwest tonight. Another seabreeze is
expected Monday afternoon.

Long Term...High pressure centered to the south will keep
conditions over the waters below SCA criteria. Expect some
marine stratus/fog to develop in warming air temperatures this
week. Onshore flow directions expected for the most part, with
diurnal sea breeze. Wave heights generally remain 2 to 3 ft.

&&

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

&&

$$


NEAR TERM...Combs
SHORT TERM...Combs
LONG TERM...Cornwell/Ekster