Area Forecast Discussion
Issued by NWS Portland, ME-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
FXUS61 KGYX 140245
Area Forecast Discussion
National Weather Service Gray ME
945 PM EST Fri Jan 13 2017
High pressure will build in from the west tonight and Saturday. A
weak cold front will cross the area the area early Sunday,
although will not produce more than some clouds and a few flurries
in the moutnains. High pressure will build in behind the front
Sunday afternoon through Monday. The high pressure shifts east on
Tuesday and will allow a southwest flow of warmer air into the
region. Weak low pressure crosses the region mid-week with a
threat of precipitation.
.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
-- Changed Discussion --945 pm Update: Based on current temp trends only very minor tweaks
needed. Winds continue to slowly diminish but still gusty in some
areas. Forecast for the rest of the evening looks good.
7 pm Update: Winds have been diminishing in the
last hour and this trend will continue. Input the latest obs data
and made only minor tweaks to temps and winds for the next few
hours. Previous forecast looks good.
Cold air advection well underway on a strong northwest wind. The
strongest of the winds are occurring now and will begin to drop
off this evening. Will continue with the wind chill advisory
although wind chills are marginal with the coldest wind chill
affecting terrain above 2000 feet. Expect a generally clear night
with some clouds lingering in the mountains. Low temperatures will
drop to below zero in the mountains and the single numbers near
-- End Changed Discussion --
.SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/...
High pressure crests overhead Saturday with light winds expected.
High temperatures will be below normal with highs in the teens
north and 20s south. Sunny skies as models indicate low pressure
will remain south of the forecast area Saturday. Clear skies
Saturday night and cold but not as cold as tonight. Expect some
clouds and snow showers to develop in the mountains as a cold
.LONG TERM /SUNDAY THROUGH FRIDAY/...
High pressure will build over northern New England by Sunday
afternoon, after a secondary cold front crosses the region Sunday
morning. Cold air advection and gusty winds will follow the front.
A favorable northwesterly direction may allow for a few upslope
snow showers over the higher terrain, however moisture will be
lacking during this period.
The large surface ridge will gradually build south and east off
the Mid Atlantic Region Monday. This will allow for a moderation
trend in temperatures as a southwest flow develops over the
region. By Tuesday, a backdoor front cross through the forecast
area as high pressure rebuilds over the Canadian Maritimes. This
will put in place a strong frontal boundary over southern New
Hampshire as low pressure passes well to our west. Snow and mixed
snow and rain will break out Tuesday night. By Wednesday, a strong
southwest flow above the surface will gradually warm the column,
bringing rain and possibly drizzle to the regionl.
A vigorous short wave trough will lead to the development of low
pressure along the northern New England coastline Thursday, before
exiting into the Canadian Maritimes. There will be little in the
way of cold air behind this departing system.
.AVIATION /03Z SATURDAY THROUGH WEDNESDAY/...
Short Term...VFR through Saturday night.
Long Term...VFR through early Tuesday afternoon. Ceilings then
will be lowering with rain and snow entering the region Tuesday
night. IFR conditions continuing through Wednesday, with slowly
improving conditions on Thursday.
Short Term...Small craft advisory for the coastal waters. Winds
will drop off by later tonight.
Long Term...NW winds may approach SCA levels briefly Sunday
afternoon, but otherwise will remain below criteria through
Wednesday. Low pressure will bring gusty winds to the coastal
waters on Thursday.
ME...Wind Chill Advisory until 10 AM EST Saturday for MEZ007>009.
NH...Wind Chill Advisory until 10 AM EST Saturday for NHZ001.
MARINE...Small Craft Advisory until 6 AM EST Saturday for ANZ150>154.