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WWUS20 KWNS 270438

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SPC WW 270438

MDZ000-NCZ000-VAZ000-CWZ000-271500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 810

NWS STORM PREDICTION CENTER NORMAN OK

1225 AM EDT SAT AUG 27 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       THE LOWER EASTERN SHORE OF MARYLAND

       FAR EASTERN NORTH CAROLINA

       SOUTHEAST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY MORNING FROM 1225 AM UNTIL 1100 AM EDT.



TORNADOES...HAIL TO 0.5 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 50 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH OF WALLOPS

VIRGINIA TO 40 MILES SOUTHEAST OF NEW BERN NORTH CAROLINA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



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...CONTINUE...WW 809...



DISCUSSION...SHOWERS AND SCTD TSTMS EXPECTED TO PERSIST IN A W-E ARC

OF LOW LVL CONFLUENCE MOVING NWD ACROSS NE NC AND THE ADJACENT CSTL

WATERS ON NRN SIDE OF IMMEDIATE CIRCULATION OF HRCN IRENE.  FARTHER

N...A SEPARATE BAND OF MORE INTERMITTENT ACTIVITY MAY PERSIST AND

MOVE NWD FROM OFF THE MOUTH OF CHESAPEAKE BAY.

INCREASING LOW TO MID LVL WIND FIELD WITH THE CONTINUED NWD MOVEMENT

OF IRENE...AND CONTINUED LOW LVL THETA-E ADVECTION AHEAD OF

STORM...WILL CREATE AN ENVIRONMENT INCREASINGLY FAVORABLE FOR LOW

LVL ROTATION/POSSIBLE TORNADOES NWD INTO TIDEWATER VA AND THE LWR

ERN SHORE OF MARYLAND THROUGH MID/LATE MORNING SATURDAY...WHILE

EXISTING THREAT PERSISTS OVER E CNTRL AND NE NC.



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

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 12045.





...CORFIDI

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