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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 338

NWS STORM PREDICTION CENTER NORMAN OK

800 PM EDT FRI JUN 1 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       DISTRICT OF COLUMBIA

       DELAWARE

       CENTRAL AND EASTERN MARYLAND

       FAR NORTHEAST NORTH CAROLINA

       SOUTHWESTERN NEW JERSEY

       SOUTHEAST AND EAST CENTRAL PENNSYLVANIA

       CENTRAL AND EASTERN VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 800 PM

UNTIL 200 AM EDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES EAST SOUTHEAST OF

ROANOKE RAPIDS NORTH CAROLINA TO 45 MILES NORTHEAST OF HARRISBURG

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 333. WATCH NUMBER 333 WILL NOT BE IN EFFECT AFTER

800 PM EDT. CONTINUE...WW 332...WW 334...WW 335...WW 336...WW

337...



DISCUSSION...THREAT FOR ISOLD TORNADOES AND DMGG WIND EXPECTED TO

PERSIST THROUGH MID-LATE EVE ACROSS WW AREA.  IT APPEARS THAT THIS

THREAT WILL REMAIN BIMODAL...WITH /1/ EPISODIC STRENGTHENING OF LOW

LVL MESOCYCLONES ASSOCIATED WITH SEMI-DISCRETE/BROKEN LINE

SEGMENTS/SHALLOW SUPERCELLS NOW OVER THE CHESAPEAKE BAY REGION...AND

/2/ EMBEDDED CIRCULATIONS ALONG FRONTAL/PRE-FRONTAL SQLN NOW

ENTERING WRN PORTIONS OF THE PA/MD/VA PIEDMONT.  CONTINUED LOW LVL

MOISTURE RETURN...AND STRENGTHENING OF LOW TO MID LVL WIND FIELD

ASSOCIATED WITH THE AMPLIFICATION/EWD ADVANCE OF UPSTREAM SHORTWAVE

TROUGH...EXPECTED TO SOMEWHAT OFFSET NOCTURNAL STABILIZATION TO

MAINTAIN A RISK FOR SVR WEATHER INTO THE NIGHT.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 21040.





...CORFIDI

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