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851 

WWUS20 KWNS 171756

SEL4

SPC WW 171756

NCZ000-VAZ000-CWZ000-172300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 594

NWS STORM PREDICTION CENTER NORMAN OK

155 PM EDT FRI JUL 17 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       FAR NORTHEAST NORTH CAROLINA

       SOUTHEAST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 155 PM UNTIL 700

PM EDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

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

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES EAST AND WEST OF A LINE FROM 20 MILES WEST OF WALLOPS

VIRGINIA TO 40 MILES EAST OF ROANOKE RAPIDS NORTH CAROLINA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 592...WW 593...



DISCUSSION...ORGANIZED CLUSTER OF TSTMS WITH EMBEDDED SUPERCELLS

REMAINS COINCIDENT WITH MESOLOW DEVELOPING ENEWD THROUGH S-CNTRL VA.

AIR MASS IN ADVANCE OF THESE STORMS IS HOT AND MOIST WITH MLCAPE OF

1000-2000 J/KG.  ISALLOBARIC RESPONSE TO SURFACE LOW WILL MAINTAIN A

CORRIDOR OF BACKED LOW-LEVEL WINDS AHEAD OF STORMS...RESULTING IN A

FAVORABLE ENVIRONMENT FOR ISOLATED TORNADOES.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 27030.





...MEAD/IMY

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