Area Forecast Discussion
Issued by NWS Portland, ME-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
FXUS61 KGYX 091117
Area Forecast Discussion
National Weather Service Gray ME
617 AM EST Fri Dec 9 2016
Some of the coldest air of the season will begin to move in today
in the wake of a cold front. Mountain snow showers will continue
through the day...with several inches of snow possible north of
the notches. High pressure will build in for the weekend
continuing cold temperatures. A low will approach the region on
Monday with snow spreading across the region, possibly with mixed
precipitation in southern zones. Cold high pressure looks to move
in for Tuesday.
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
615 AM Update...Little change to the going forecast. Snow showers
and flurries downwind of the mountains have come to an end for the
most part. Upslope snow showers should however continue all day in
the Whites. Winds increase and gust to around 30 MPH today with
A cold frontal boundary traversing the region will move offshore
early this morning. Widely scattered snow squalls in the mountains
and possibly foothills may occur prior to 12z. One or two may
reach the coastal plain. Otherwise, upslope snows in the Whites
will get going today and add up to several inches on
western/northwestern slopes. A few of the most favored locations
may pick up 4 to 6 inches. Otherwise, cold and windy conditions
will be the rule today, with temperatures not budging much at all.
In fact they may actually drop some this afternoon. Good mixing
will also promote wind gusts around 30 mph. By late afternoon and
early evening, wind chill values are expected to be in the teens
area-wide (lower in the mountains).
.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SATURDAY/...
Cold northwest winds continue tonight with temperatures dropping
into the teens and single digits. Mixing should continue overnight
and should not allow the winds to completely die off. Therefore,
wind chill values may approach zero degrees even on parts of the
coastal plain. Upslope snow showers are likely to continue this
evening then gradually wane overnight.
A cold day is in store for Saturday with highs in the teens and
20s. However, winds are not expected to be as strong as today`s.
Otherwise, partly sunny skies are expected.
.LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/...
High pressure will continue to build in from the west Saturday
night. Expect variable cloudinesss overnight with lows ranging
through the single numbers north and lower to mid teens south.
High pressure will shift offshore on Sunday as a warm front
approaches from the southwest. Should see at least partly sunny
skies for most of the day before high clouds move in from the
west late in the day. Highs will range from the mid teens to mid
20s north and mid 20s to near 30 south.
Low pressure moving through the southern Great lakes Sunday
night will lift a broad area of over-running into the region
ahead of a warm front. Expect light snow to gradually over-
spread the region from southwest to northeast overnight. GFS
QPF pretty much in line with the ECMWF producing snow
accumulations by daybreak Monday in the 1 to 3 inch range with
highest amounts in southwest New Hampshire. Lows overnight will
range through the teens north and upper teens to lower 20s
Warm front will lift into central New England on Monday as low
pressure pushes in from the west. Expect snow to continue
in inland locations on Monday as best over-running ahead of the
warm front sets up over the region. Moderate to occasionally
heavy snow will be likely in favorable upslope locations in
Maine and New Hampshire with the coastal areas going over to a
mix and then to rain as warmer air pushes in on Strong onshore
flow. North of the change-over interior sections will see the
potential for another 3 to 6 inches during the day with lesser
amounts in the far north and along the coast. Highs Monday will
through the 20s to near 30 inland and in the lower to mid 30s
along the coast.
Expect snow and rain or mixed precip to taper off Monday
afternoon in southern and central zones as best over-running
lifts into northern Maine and a cold front swings in from the
west. Far northern zones could see several additional inches of
snow Monday evening north of the front and in snow showers as
as upslope kicks in behind departing low pressure. Looking for
partial clearing downwind of the mountains. Lows overnight will
range from the mid teens north to the mid 20s south.
Narrow ridge of high pressure will build in from the west on
Tuesday producing a mix of sun and clouds high temps close to
normal. Will generally see 20s north and lower to mid 30s
A cold front will approach from the west Tuesday night and this
boundary will stall over the region by Wednesday morning. Expect
increasing clouds overnight with a chance of snow showers by
morning in far northwest zones. Lows overnight will range
through the teens inland to the lower 20s along the coast.
Stalled front boundary will be the focus for Light over-running
snow on Wednesday with some minor accumulations possible in the
afternoon as a broad shallow shortwave swings in from the west
and spins up weak surface low pressure over the region. Highs
will range from the mid 20s to mid 30s. Expect snow to gradually
wind down Wednesday night as low pressure intensifies offshore
and downslope flow kicks in behind departing low.
.AVIATION /11Z FRIDAY THROUGH TUESDAY/...
Short Term...NW flow strengthens today in the wake of a cold
front, allowing for gusts of 25 to 30 kt. VFR conditions are
expected today except perhaps at HIE where rounds of SHSN drop
VSBYs to IFR or lower at times. VFR conditions are expected
tonight and Saturday with diminishing winds.
VFR Saturday night and Sunday. IFR/LIFR ceilings/vsby developing
Sunday night and persisting through Monday. Becoming VFR downwind
of the mountains Monday night with areas of MVFR/IFR ceilings in
the north. VFR Tuesday.
Short Term...Marginal gales continue on the ocean waters today
while SCA continues for the bays. Winds gradually diminish tonight
SCA`s likely Monday and early Tuesday.
MARINE...Small Craft Advisory until 11 PM EST this evening for ANZ151-
Gale Warning from 10 AM this morning to 11 PM EST this evening