Winslow, Maine Weather Forecast Discussion

226
FXUS61 KGYX 201251
AFDGYX
Area Forecast Discussion
National Weather Service Gray ME
851 AM EDT Sat Sep 20 2025
.SYNOPSIS...
High pressure slides across northern New England today through
Sunday providing fair weather and cold conditions tonight. High
pressure moves offshore Monday with increasing temperatures
into Tuesday. Moisture will also increase into the region
Tuesday through mid week that will bring chances for some
showers.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
845am Update...Expired last night`s frost/freeze headlines
little/no change in today`s forecast.
Previous Discussion...
Nighttime microphysics satellite imagery early this Saturday
morning shows clear skies over the region with sfc high pressure
located over Quebec. These clear skies and low dew points are
as expected allowing for strong radiational cooling conditions.
Some sites are experiencing some intermittent mixing though,
which is resulting in some swings in temperatures. Current
readings range from around the freezing mark across the northern
valleys with upper 30s/lower 40s in most other locations. The
exception is along the coast and in the urban corridors where
temperatures are still into the 50s. Additional cooling can be
expected through sunrise with the current frost/freeze headlines
remaining in effect.
High pressure will remain in control today, allowing for a sunny
day with near seasonable high temperatures into the 60s to near
70 degrees from north to south. Despite weak winds, low
afternoon RH will introduce additional fire wx concerns with
additional details in the fire section below.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/...
Sfc high pressure will crest over New England tonight, likely
allowing for an even colder night with clear skies prevailing.
Forecast low temperatures range from the middle 20s across the
northern valleys with lower to middle 30s in most other
locations away from the coast and outside of the urban
corridors. In collaboration with neighboring WFOs, went ahead
and issued freeze warnings across northern NH and the western ME
mtns and foothills with frost advisories elsewhere away from
the coast and outside of the urban corridor of southern NH.
Valley fog will be possible late due to the air/water
temperature gradient.
High pressure will begin to slowly drift east of the area on
Sunday, allowing for developing southerly flow. This will allow
highs to reach the lower 70s in most locations with partly to
mostly sunny skies.
&&
.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
01Z NBM Update...No significant changes with the latest NBM.
High pressure moves offshore early next week allowing
temperatures to moderate into Tuesday. Poorly organized
troughing then moves into the Northeast Tuesday through Thursday
with PoPs remaining largely the same as the previous run of the
NBM around 40 percent.
Previously...
High pressure begins to slide east of the area Sunday night.
Some low level moisture advection could bring some lower clouds
or fog in overnight. The gentle breeze and chance of more
clouds will reduce time of good cooling, and not expecting as
cold temps Sunday night. Some patch frost may be possible in the
valleys in northern NH and mtns of western ME.
Dry weather continues Monday, but increase of clouds should be
apparent. Low pressure lifting north of the Great Lakes will
bring a warm front into the Northeast Monday and Monday night.
NE translation of the system means the slow arrival of deeper
moisture for the chance of showers, after sunset.
Broad area of unsettled weather will then cross Tuesday and
Wednesday. Main message here is on and off showers, with one or
two periods of rainfall possible in the forecast area. Global
models are still very much at odds of a more accurate depiction.
The lack of a more defined synoptic feature reduces
predictability as far as timing and amounts. But given PWATs and
lack of sharper forcing features, the likelihood of much more
than a quarter-inch of precipitation in any one remains below
40%.
This round of precipitation will be the last before another
round of dry conditions late week as a cold front passes and
low-RH air again takes residence in northern New England.
&&
.AVIATION /13Z SATURDAY THROUGH WEDNESDAY/...
Short Term...Other than valley FG again late tonight into
early Sunday morning, VFR conditions will persist with generally
light and variable flow today into tonight before becoming
southerly on Sunday. No LLWS is anticipated through the period.
Long Term...Return flow around a departing high may bring low
clouds or fog supporting IFR Sunday night. This should lift
slightly into the day Monday, but patchy MVFR still possible.
Additional restrictions are possible into midweek with SHRA
moving into the region through Wednesday.
&&
.MARINE...
Short Term...High pressure will allow for continued light winds
and low seas through this weekend.
Long Term...High pressure moves into the Gulf of Maine Sunday
night. An increase in low clouds will be possible, potentially
reducing vis into Monday morning. Unsettled weather arriving
from the west into midweek will tend to shift southerly winds
NE. Wave heights increase from 1-3 to 4-6 ft by Tuesday
afternoon.
&&
.FIRE WEATHER...
Today will be less breezy but much drier as an Arctic
originating airmass builds into the region. Relative humidity
values are expected to drop into the 20-30 percent range which,
despite light winds, will continue elevated fire weather
concerns, especially if fuels are readily available. The next
chance for measurable rainfall arrives Monday night through
Wednesday, but forecast amounts remain light.
&&
.GYX WATCHES/WARNINGS/ADVISORIES...
ME...Freeze Warning from midnight tonight to 8 AM EDT Sunday for
     MEZ007>009-012-033.
     Frost Advisory from midnight tonight to 8 AM EDT Sunday for
     MEZ013-014-018>022.
NH...Freeze Warning from midnight tonight to 8 AM EDT Sunday for
     NHZ001>004.
     Frost Advisory from midnight tonight to 8 AM EDT Sunday for
     NHZ005>009-011.
MARINE...None.
&&
$$
NEAR TERM...Cornwell/Tubbs
SHORT TERM...Tubbs
LONG TERM...Cornwell/Schroeter

NWS GYX Office Area Forecast Discussion