Area Forecast Discussion
Issued by NWS Sterling, VA

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FXUS61 KLWX 011959
AFDLWX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
259 PM EST Thu Dec 1 2016

.SYNOPSIS...
High pressure will gradually move into the region tonight through
early next week. Disturbances will cross the area late Sunday and
again Tuesday.

&&

.NEAR TERM /THROUGH TONIGHT/...
Remaining breezy through early evening with wind gusts up to
25-30 mph across the northen half of the area (slightly higher
across N MD)...as pressure gradient remains tight between low
pressure moving off the NE coast and building high pressure
currently centered over Louisiana. Winds should weaken shortly
after sunset as atmosphere decouples. Lows tonight generally in
the 30s...with upper 20s in the typically colder locations.
Upslope flow could lead to some very light snow along the
Allegheny Front...little-to-no accumulations expected.

&&

.SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/...
High pressure will continue to gradually build into the area as we
head into the weekend...with dry weather continuing. Breezy winds
expected during the day Friday and Saturday once mixing commences.
Winds abate in most places after sunset. Seasonable high/low
temperatures expected.

&&

.LONG TERM /SUNDAY THROUGH THURSDAY/...
High pressure lingers near the Mid-Atlantic Sunday as an upper level
shortwave trough approaches from the west, increasing the chance of
precipitation late Sunday into Monday.

High pressure builds briefly on Monday as a low pressure system lifts
from the Gulf states into the Great Lakes area Monday into Tuesday night
with its associated fronts increasing the chance of precipitation in
our CWA. Dry conditions Wednesday before a strong cold front approaches
from the west Thursday.

High temperatures will be in the 40s and 50s.. with some 30s at higher
elevations. Lows temperatures will be in the 20s to 30s on Sunday and
Monday nights, which could allow for some frozen precipitation...and
in the 30s and 40s on Tuesday and Wednesday nights... with some 20s
and higher elevations.

&&

.AVIATION /19Z THURSDAY THROUGH TUESDAY/...
VFR through Saturday as high pressure builds into the area. Gusty
westerly winds up to 20kts are possible during the day Friday and
Saturday.

Dry conditions mainly for Sunday into Monday, with some showers possible
Sunday night, as an upper level disturbance moves across the region.
A storm system could bring additional precipitation Monday night into
Tuesday night. Sub-VFR conditions possible Sunday night, and Monday
night into Tuesday.

&&

.MARINE...
SCA continues until 6 PM...as pressure gradient remains tight
between departing low and building high. While winds just of the
surface are expected to remain elevated tonight...expectation is
that sfc winds should weaken as atmosphere decouples after sunset.
Increased mixing will allow SCA winds to return Friday...with a
SCA Advisory in effect from 7 AM through 6 PM. Another SCA will
likely be needed Saturday.

Dry conditions mainly for Sunday into Monday, with some showers possible
Sunday night, as an upper level disturbance moves across the region.
A storm system could bring additional precipitation Monday night into
Tuesday night. Winds expected to remain below the small craft advisory
criteria between Sunday and Monday. A period of gusty winds possible
on Tuesday.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory until 6 PM EST this evening for
     ANZ530>543.
     Small Craft Advisory from 7 AM to 6 PM EST Friday for
     ANZ530>543.

&&

$$
SYNOPSIS...MSE
NEAR TERM...MSE
SHORT TERM...MSE
LONG TERM...IMR
AVIATION...IMR/MSE
MARINE...IMR/MSE



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