Saco, Maine 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

263
FXUS61 KGYX 131751 CCA
AFDGYX

Area Forecast Discussion
National Weather Service Gray ME
Issued by National Weather Service Caribou ME
104 PM EDT Tue May 13 2025

.SYNOPSIS...
High pressure continues to drift east of New England through
the week. The result will be dry conditions and seasonable
temperatures. Most days will see 60s and 70s, with the coolest
readings near the coast. The end of the work week into the
weekend will feature yet another slow moving low pressure system
that will increase rain chances. It does not look like a
washout at this time, but showers and thunderstorms will be
possible each day beginning around Friday.

&&

.NEAR TERM /THROUGH TONIGHT/...
1:00PM Update... Minor tweaks to update temperatures,
dewpoints, and sky grids to match current observations. High
clouds stay over southern Maine and NH. Otherwise, previous
forecast still on track.

Previous...

A reinforcing high pressure center builds southward into the
Canadian Maritimes today, setting up a northeast to easterly
flow through the day. This keeps the coast cooler, with highs
limited to the upper 50s to low 60s. Temperatures progressively
moderate further north and west, with highs into the low to mid
70s through the Connecticut River Valley.

Additionally, a broad and slow moving upper level low drifts
northward through the southern Appalachians today, spreading
some high cloud cover across the area and providing filtered
sunshine. The clouds will become progressively thinner from
southwest to northeast across the area.

&&

.SHORT TERM /WEDNESDAY/...
A ridge extends from the high pressure center across northern
New England tonight, bringing light to calm winds through the
overnight. High clouds continue to filter in from the south,
keeping temps a little warmer and lows mainly in the 40s. The
coolest readings will be found further east where the cloud
cover will be thinnest, and temps don`t warm as much during the
daytime today.

The high pressure center slowly progresses south of Nova Scotia
through the daytime tomorrow, bringing a shift to more
southerly wind and moderating temperatures. The south winds
keeps highs mainly in the 60s along the coast, but inland areas
warm into the 70s. Clouds continue to filter in through the day
from the slow moving upper level low, with overcast conditions
likely developing by the afternoon hours across southern New
Hampshire The most sunshine will be found across the north. A
few showers are possible by the late afternoon across
southwestern New Hampshire as well. With this set up, highs
reach the low 70s across southern New Hampshire, while upper
70s are likely north of the mountains and near the Canadian
border.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/...
Evening Update: Not much to improve on previous messaging. Will
add that with lack of additional forcing ahead of warm front
Friday, diurnal convection may be favored towards the mountains
and higher terrain. Saturday timing of frontal locations will be
key. Cold front is trending to exit the eastern Great Lakes
during the morning, with a good portion of the forecast area
perhaps in the warm sector during the daytime.

Previous Discussion...
Key Message: Dry to start the extended but becoming unsettled
again this weekend.

Impacts: After recent wet weather the main concern would be
training of showers leading to flooding. But any training
potential at this range is low confidence at best.

Forecast Details: Extended begins dry across the forecast area.
Temps will be warm as well...save for the immediate coastline
where sea breezes will knock down readings around midday.

An upper low drifting north from the Southeast may make it far
enough north for some diurnal shower activity to creep into
southern NH...but chances are not high at this time.

Upper low farther west becomes more of an influence Fri. It will
push a front east and provide a focus for diurnal convection.
Precip chances will be highest across the western half of the
forecast area...but cannot be ruled out for any of our local
area. The setup Sat looks similar...except maybe a little
delayed until the evening hours. In both cases we will be
monitoring trends with convection. CSU machine learning severe
weather probabilities show small but non-zero severe weather
threat Fri and Sat. And ECMWF EFI has a favorable CAPE/shear
overlap...especially Sat.

Otherwise no significant changes from the NBM consensus blend
forecast.

&&

.AVIATION /17Z TUESDAY THROUGH SATURDAY/...
Short Term...VFR conditions prevail through Wednesday at all
terminals. A sea breeze develops each morning at coastal
terminals.

Long Term...VFR conditions expected to prevail thru Thu. By Fri
some local MVFR or lower conditions are possible in SHRA...with
CIGs slowly lowering and expanding into the weekend. IFR
conditions are possible...but will depend on how quickly upper
low tracks up the East Coast.

&&

.MARINE...
Short Term...High pressure remains centered east of the waters,
bringing fair conditions through Wednesday. A sea breeze
develops along the coast by late morning today and tomorrow.

Long Term...Winds and seas expected to remain below SCA
thresholds. Late in the work week rain showers will move in from
the south and slowly into the weekend lift north across all
waters.

&&

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

&&

$$


NEAR TERM...Clair/Brennan
SHORT TERM...Clair
LONG TERM...Cornwell/Legro