National Weather Service Raw Text Product

000 
WWUS20 KWNS 071718
SEL6  
SPC WW 071720
DCZ000-MDZ000-PAZ000-VAZ000-WVZ000-072300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 286 
NWS STORM PREDICTION CENTER NORMAN OK 
120 PM EDT WED MAY 7 2003

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 

       DISTRICT OF COLUMBIA
       WESTERN AND CENTRAL MARYLAND
       CENTRAL PENNSYLVANIA
       NORTHERN VIRGINIA
       NORTHEAST WEST VIRGINIA

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 120 PM UNTIL
700 PM EDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 70 STATUTE MILES
EAST AND WEST OF A LINE FROM 30 MILES EAST NORTHEAST OF DUBOIS
PENNSYLVANIA TO 60 MILES SOUTH SOUTHWEST OF WASHINGTON DC.

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 284...WW 285...


DISCUSSION...LINE OF STRONG TO SEVERE THUNDERSTORMS IS LIKELY TO
SPREAD ENEWD ACROSS THE APPALACHIANS INTO AN AXIS OF MODERATE
INSTABILITY.  SBCAPES TO 2000 J/KG SHOULD EXTEND INTO NRN VA WITH
SBCAPES TO 1000 J/KG WELL INTO CENTRAL PA.  0-6 KM SHEAR NEAR 40 KT
WILL SUPPORT SMALL LINES/BOW ECHOES AS WELL AS A FEW
SUPERCELLS...WITH PRIMARY SEVERE THREATS OF LARGE HAIL AND DAMAGING
WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 26025.


...EVANS

412,0770 380,0761 380,0784 412,0794