Area Forecast Discussion
Issued by NWS Sterling, VA

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FXUS61 KLWX 230213 AAA

Area Forecast Discussion...UPDATED
National Weather Service Baltimore MD/Washington DC
913 PM EST Wed Nov 22 2017

High pressure will build over the area overnight and hold
through Friday. Another cold front will approach overnight
Friday into Saturday before passing through Saturday night. High
pressure returns for Sunday and Monday.



Winds will continue to diminish tonight as high pressure builds
from the west. Stratocumulus over the mtns are expected to
gradually dissipate overnight. Otherwise, clear and cold
tonight with lows in the 20s in most places except low 30s in
southern MD and city centers.


High pressure will continue to build overhead for Thanksgiving
Day and Thanksgiving night, resulting in below normal
temperatures and dry conditions. High pressure will shift
eastward off the DELMARVA peninsula Friday, allowing winds to
turn more southerly, which will help temperatures return to more
seasonable levels with highs in the low-mid 50s and low
temperatures Friday night in the mid-upper 30s for most.


A cold front will approach from the west on Saturday, with
an upper trough over the eastern CONUS. Slight rain chances
will be possible Saturday across the western and northern
portions of the CWA as the primary energy will remain to the
north. At the same time a coastal low pressure system will be
moving northeast away from the Carolina coast. At this time,
little to no impact is forecast for our area, however should
this low move a further northwestward, southeastern portions of
the region could see some rain showers. Behind the frontal
passing, snow showers will be possible along the typical higher
terrain locations, with little to no accumulation expected.

Surface high pressure builds on Sunday as an upper trough axis
moves east of our CWA. Chilly, breezy, and mostly dry
conditions will prevail as any remaining upslope snow showers
will wane. Sunday will highlight colder than average
temperatures, with most locations not getting out of the 40s,
and overnight lows Sunday night similar to tonight. Monday will
see high pressure move eastward from the Ohio Valley, migrating
off the coast late Monday. With the upper level trough just
exiting the region, temperatures will be slightly warmer Monday,
yet still below average for late November. Dry conditions

Southwest flow returns on Tuesday thanks to the migration of
the high to our east, returning temperatures to mid-upper 50s,
and breaching the 60 degree mark on Wednesday. Models are in a
bit of a disagreement with an approaching cold front Wednesday,
so will continue to monitor this situation over the next couple
of days to iron out the details and timing.


VFR conditions will prevail across all the terminals for
Thanksgiving Day and Friday as high pressure builds overhead.

Mainly VFR conditions expected Saturday, with precipitation
possible later that day as a cold front approaches the area.
Potential exists for periods of MVFR conditions Saturday
afternoon and evening. Drier/VFR conditions expected Sunday
into Monday over the terminals.


A Small Craft Advisory remains in effect for the coastal waters
tonight as gusty northwesterly winds will start to subside
toward Thursday morning. No headlines expected thereafter
through Friday night as high pressure builds in overhead.

Winds are expected to stay below threshold on Saturday
into Saturday night as cold front moves through the area. Winds
will increase on Sunday into Sunday night, therefore small
craft advisories will be possible. Winds will decrease below
SCA threshold on Monday.


MARINE...Small Craft Advisory until 6 AM EST Thursday for ANZ531>534-
     Small Craft Advisory until 10 PM EST this evening for ANZ530-


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