Area Forecast Discussion
Issued by NWS Sterling, VA

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

000
FXUS61 KLWX 120802
AFDLWX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
402 AM EDT Sat Aug 12 2017

.SYNOPSIS...

A cold front will move through the area this evening and become
stationary across the Carolinas early in the week. Weak high
pressure builds over the area Sunday and holds through the end of
the week.

&&

.NEAR TERM /THROUGH TONIGHT/...

As of 3:30am, slow moving heavy thunderstorms have pushed east of
the western shore of the Chesapeake Bay. In their wake is a
swath of flooded roads and trees down.

A weak low center (1014mb) is positioned just west of the I-95
corridor with light rain showers south of a line from Westinster to
Winchester. A stronger low is centered over the Quebec and Ontario
line.

An associated cold front currently over Ohio approaches through the
today warranting categorical PoPs again across much of the area.
MLCAPE up to 1000 to 1500 j/kg again warrants moderate shower and
thunderstorm wording across the area. Dewpoints remain in the low
70s with max temps in the mid 80s.

&&

.SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/...

Cold front crosses the area tonight with PoPs ending by 2am. Cold
front persists south of the area through the middle of the week.
Near or below normal temperatures through Monday as high pressure
builds to the north.


&&

.LONG TERM /TUESDAY THROUGH FRIDAY/...

A short wave in the southern stream looks to be crossing
southern VA Tuesday morning. Precipitation should be ending by
midday. High pressure should move over the region for midweek.
The next chance for rain should be Thursday night into Friday as
another short wave moves onto the east coast in what is
unusually fast zonal flow for mid August.

Highs will be in the 80s, lows in the 60s - about normal for
this time of the year.

&&

.AVIATION /08Z SATURDAY THROUGH WEDNESDAY/...

Rain with embedded scattered thunderstorms again today as a cold
front approaches the DC metros before crossing tonight.

Tranquil/VFR behind the cold front Sunday and Monday.

There will be a chance of rain/degraded ceilings Monday
night/early Tuesday.

&&

.MARINE...

South flow generally 15 knots today ahead of a cold front that
crosses tonight. High pressure builds north of the area Sunday and
Monday.

SCA conditions not expected Monday or Tuesday. Rain possible
MOnday night.

&&

.TIDES/COASTAL FLOODING...

Latest forecasts keeps water levels below minor flooding since
the flow will be weakening a bit...but it will be close during
the high tide cycle near Straits Point this evening.


&&

.HYDROLOGY...

We currently have flood warnings in effect for western Prince
William and southern Prince Georges Counties. These will be
reevaluated to determine if they should be continued or
cancelled.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory until 4 AM EDT early this morning for
     ANZ534-537-543.

&&

$$

PRODUCTS...BAJ/WOODY!



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.