020
WWUS20 KWNS 271914
SEL2
SPC WW 271914
DCZ000-MDZ000-PAZ000-VAZ000-WVZ000-CWZ000-280200-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 632
NWS STORM PREDICTION CENTER NORMAN OK
315 PM EDT THU AUG 27 2026
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
DISTRICT OF COLUMBIA
CENTRAL MARYLAND
CENTRAL PENNSYLVANIA
NORTHERN VIRGINIA
EASTERN PANHANDLE OF WEST VIRGINIA
COASTAL WATERS
* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 315 PM UNTIL
1000 PM EDT.
* PRIMARY THREATS INCLUDE...
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
SCATTERED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE
A TORNADO OR TWO POSSIBLE
SUMMARY...THUNDERSTORM COVERAGE AND INTENSITY IS EXPECTED TO
INCREASE ACROSS THE REGION THIS AFTERNOON AS A SHORTWAVE TROUGH AND
ATTENDANT COLD FRONT APPROACH FROM THE WEST. WARM AND MOIST
CONDITIONS HAVE FOSTERED STRONG BUOYANCY ACROSS THE REGION WHILE
INCREASING MID-LEVEL FLOW CONTRIBUTES TO STRENGTHENING DEEP-LAYER
VERTICAL SHEAR. THESE ENVIRONMENTAL CONDITIONS SUPPORT THE POTENTIAL
FOR STRONG TO SEVERE THUNDERSTORMS, WITH DAMAGING WIND GUSTS AND
ISOLATED LARGE HAIL AS THE PRIMARY RISKS. A LOW-PROBABILITY RISK FOR
A BRIEF TORNADO OR TWO EXISTS AS WELL.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH NORTHEAST
OF WILLIAMSPORT PA TO 55 MILES SOUTHWEST OF WASHINGTON DC. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU2).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 630...WW 631...
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO
1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A
FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR
27020.
...MOSIER
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