000
WWUS20 KWNS 231926
SEL9  
SPC WW 231926
DCZ000-MDZ000-NCZ000-VAZ000-WVZ000-CWZ000-240300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 739
NWS STORM PREDICTION CENTER NORMAN OK
325 PM EDT WED JUL 23 2008

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

       DISTRICT OF COLUMBIA
       MUCH OF MARYLAND
       PARTS OF WESTERN NORTH CAROLINA
       PARTS OF WESTERN VIRGINIA
       SMALL PART OF EASTERN WEST VIRGINIA
       COASTAL WATERS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 325 PM UNTIL
1100 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 APPROXIMATELY ALONG AND 65
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH
NORTHWEST OF BALTIMORE MARYLAND TO 15 MILES WEST SOUTHWEST OF
CHARLOTTE NORTH CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH
SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 735...WW 736...WW
737...WW 738...

DISCUSSION...THUNDERSTORMS INCREASING ALONG AND AHEAD OF COLD FRONT
NOW CROSSING APPALACHIANS.  WITH CLOUDS CLEARING...AIR MASS ACROSS
WATCH AREA IS NOW BECOMING UNSTABLE AND WEAKLY CAPPED.  WITH STRONG
UPPER TROUGH APPROACHING  FROM OH VALLEY...SHEAR AND LARGE SCALE
ASCENT SUPPORTS INCREASING WIND DAMAGE POTENTIAL ALONG WITH
MARGINALLY SEVERE HAIL AS STORMS SPREAD E OMTNS.

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 550. MEAN STORM
MOTION VECTOR 27030.


...HALES