

747 

WWUS20 KWNS 291725

SEL4

SPC WW 291725

DCZ000-DEZ000-MDZ000-NJZ000-PAZ000-VAZ000-CWZ000-300000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 314

NWS STORM PREDICTION CENTER NORMAN OK

125 PM EDT FRI MAY 29 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       DISTRICT OF COLUMBIA

       DELAWARE

       EASTERN MARYLAND

       SOUTHERN NEW JERSEY

       PARTS OF SOUTHEAST PENNSYLVANIA

       PARTS OF NORTHERN AND CENTRAL VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 125 PM UNTIL 800

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 90

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF

PHILADELPHIA PENNSYLVANIA TO 25 MILES WEST OF RICHMOND VIRGINIA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



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.



DISCUSSION...THUNDERSTORMS WILL INCREASE IN NUMBER AND INTENSITY

ACROSS THE WATCH AREA THRU THE AFTERNOON AS AIR MASS CONTINUES TO

HEAT/DESTABILIZE.  WITH 25-30KT OF SHEAR...PRIMARY STORM MODE WILL

BE MULTI-CELLULAR WITH ASSOCIATED DAMAGING WIND AND HAIL THREAT.



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.





...HALES

