Area Forecast Discussion
Issued by NWS Portland, ME

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FXUS61 KGYX 140751
AFDGYX

Area Forecast Discussion
National Weather Service Gray ME
251 AM EST Thu Dec 14 2017

.SYNOPSIS...
Weak high pressure builds across the region today while a weak
disturbance moves by to our south. Our weather will be
punctuated by fast moving systems moving across the region, with
temperatures running below normal through the weekend. There
will be a chance for some snow showers on Friday night, and
another chance of snow showers or light snow Monday into
Tuesday.

&&

.NEAR TERM /THROUGH TODAY/...
The main wx maker will pass to our S today. A fast moving S/WV
trof will squeeze under the main upper low and spread light snow
across Srn New England. The forecast area looks like it will
remain between the two systems...but some very light...non-
accumulating snow cannot be ruled out for far Srn NH. Otherwise
clouds will gradually decrease thru the day...but despite some
sun continued CAA will keep temps from climbing out of the teens
and 20s.

&&

.SHORT TERM /TONIGHT THROUGH 6 PM FRIDAY/...
Weak high pressure and S/WV ridging aloft will work into the
area tonight thru Fri. Relaxing the gradient flow will allow for
another chilly night...with widespread single digits to lower
teens expected. Fri shallow mixing under the surface high will
also keep readings chilly...not making it out of the 20s.

We will have to watch late in the period...when the next
approaching S/WV trof may try and spread clouds and snow showers
into Wrn zones...but this looks to be mainly after 00z.

&&

.LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/...
Mean Long wave trof remains over the eastern CONUS into the
weekend with very cold temps before briefly becoming more zonal
and allowing not so cold temps briefly early next week. By late
Monday and Tuesday a series of weak short waves will once again
begin to amplify and broaden the long wave trof over southeast
Canada and the northeast CONUS bringing a return to much colder
temps and scattered snow showers or maybe even a period of light
snow sometime late Mon and into Tue depending on timing of
models. Very limited moisture will accompany all these systems
so nothing much in the way of any accumulations foreseen.

&&

.AVIATION /08Z THURSDAY THROUGH MONDAY/...
Short Term...Widespread VFR conditions expected thru Fri. A weak
area of low pressure will pass S of the forecast area
today...but only high to mid level clouds are expected across
Srn NH. Wly winds will remain gusty today...with surface gusts
up to 20 kts. Surface high pressure and S/WV ridging aloft will
move in for Fri.

Long Term...Mainly VFR through the weekend. MVFR conditions
possible Fri night into Sat at KHIE in -shsn.

&&

.MARINE...
Short Term...Wly winds will remain gusty...but generally begin
to slowly diminish thru tonight. Gale warnings have been
replaced by SCAs thru Fri morning.

Long Term...SCA may be needed in NW flow behind a cold front
Sat into Sat night.

&&


.GYX WATCHES/WARNINGS/ADVISORIES...
ME...None.
NH...None.
MARINE...Small Craft Advisory until 7 AM EST Friday for ANZ150>154.

&&

$$

NEAR TERM...Legro
SHORT TERM...Legro
LONG TERM...Marine
AVIATION...Legro/Marine
MARINE...Legro/Marine



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