Area Forecast Discussion
Issued by NWS Sterling, VA-- Remove Highlighting --
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FXUS61 KLWX 081904
Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
204 PM EST Thu Dec 8 2016
A cold front is moving through the Mid-Atlantic this afternoon.
High pressure returns to the area Friday into the weekend. Another
cold front crosses the area Monday followed by a reinforcing cold
.NEAR TERM /TONIGHT/...
Weatherwise the cold front pushing through the Mid Atlantic this
afternoon is farily tepid...but looking at observations there is a
clear delineation: eastern PA temperatures are in the low/mid 40s
while western PA is in the upper 20s. Winds have begun to increase
in the our area. This should continue for the remainder of the
afternoon as colder air is ushered into the region.
Upslope snow showers are expected to begin tonight along the
western slopes of the Highlands. Models are projecting very low
accumulation..and we continue to forecast less than 3" so we will
hold on issuing an advisory.
It will remain breezy overnight. Lows primarily in the mid
20s...around 30 in the cities...teens in the Highlands.
.SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/...
High pressure to be in control of the weather Friday-Saturday
night. Temps will be several degrees below normal (Mid 40s/upper
20s). East of I-95 will struggle to reach 40...35-40 west of I-95
to the Highlands...20s in the Highlands. Wind chills will make it
feel more like 25-30 in most locales. Snow showers expected to
continue in the Highlands through at least Friday night.
A cold Friday night with lows in the 20s everywhere except the
colder Highlands. Highs Saturday will be quite similar to Friday.
High pressure will settle over the region Saturday night providing
good radiational cooling conditions. Lows primarily in the lower
to mid 20s.
.LONG TERM /SUNDAY THROUGH WEDNESDAY/...
Surface high pressure overhead Sunday will move offshore as a
southerly flow builds over our region. A weakening upper level
shortwave could bring precipitation north of the area, but cannot
rule out precipitation reaching out over the CWA. If it does,
temperatures may be cold enough, mainly at higher elevations, to
see some type of frozen precipitation... but there is still
uncertainty on this.
Warm front moves over our area Sunday night, bringing a chance of
precipitation as a low pressure moves from the Mid-West into the
Great Lakes. Wintry precipitation possible as temperatures may be
near or below freezing in some areas before the warm front moves
through. The low will continue its track northeast and push a cold
front over our region Monday into Tuesday... with rain more likely
ahead of the front. Conditions will be drying Tuesday into Tuesday
night. Guidance disagrees for Wednesday and Thursday with GFS
bringing another cold front on Wednesday, increasing the chance of
precipitation over our area... then dry conditions on Thursday.
The Euro is drier with a couple of disturbances bringing a chance
of precipitation to the area.
.AVIATION /18Z THURSDAY THROUGH TUESDAY/...
VFR expected tonight through Saturday night. Gusty NW winds
tonight through Friday.
Mainly dry/VFR conditions on Sunday as high pressure moves
offshore. Upper level disturbance and frontal boundary could bring
some precipitation to our region Sunday into Monday... with some
sub-VFR periods. Drier expected conditions Tuesday.
Winds beginning to pick up on the waters. SCA in effect for all
waters through Friday evening...continuing past midnight
Mainly dry conditions on Sunday as high pressure moves offshore.
Upper level disturbance and frontal boundary could bring some
precipitation Sunday into Monday. Dryer conditions expected Tuesday.
Small craft advisory may be needed Sunday and Monday afternoons.
MARINE...Small Craft Advisory until 1 AM EST Saturday for ANZ530>533-
Small Craft Advisory until 1 AM EST Saturday for ANZ534-537-
Small Craft Advisory until 6 PM EST Friday for ANZ535.