

185 

WWUS20 KWNS 221816

SEL8

SPC WW 221816

DCZ000-DEZ000-MDZ000-NJZ000-VAZ000-CWZ000-230100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 418

NWS STORM PREDICTION CENTER NORMAN OK

215 PM EDT FRI JUN 22 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       DISTRICT OF COLUMBIA

       DELAWARE

       MARYLAND EXCEPT PANHANDLE

       SOUTHERN NEW JERSEY

       CENTRAL AND EASTERN VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 215 PM UNTIL 900

PM EDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES SOUTH

SOUTHWEST OF SOUTH HILL VIRGINIA TO 5 MILES NORTHWEST OF

WILMINGTON DELAWARE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 417...



DISCUSSION...TSTMS FCST TO CONTINUE INCREASING IN COVERAGE/INTENSITY

THROUGH REMAINDER AFTERNOON AHEAD OF SFC COLD FRONT...AMIDST

1000-2500 J/KG MLCAPE AND 20-30 KT EFFECTIVE SHEAR MAGNITUDES.  THIS

WILL SUPPORT PRIMARILY MULTICELLULAR CONVECTIVE MODES AND THREAT FOR

DAMAGING DOWNDRAFTS.  ISOLATED LARGE HAIL ALSO IS POSSIBLE.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 27025.





...EDWARDS

