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WWUS20 KWNS 292228

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 784

NWS STORM PREDICTION CENTER NORMAN OK

525 PM CDT THU OCT 29 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN ARKANSAS



EFFECTIVE THIS THURSDAY AFTERNOON FROM 525 PM UNTIL MIDNIGHT CDT.



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 85 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES SOUTHEAST OF

RUSSELLVILLE ARKANSAS TO 20 MILES NORTH NORTHWEST OF FLIPPIN

ARKANSAS.  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 781...WW 782...WW 783...



DISCUSSION...STRONG STORMS CONTINUE TO DEVELOP AND MOVE RAPIDLY

NNEWD ALONG AND AHEAD OF COLD FRONT SHIFTING SLOWLY EWD ACROSS ERN

OK.  SURFACE DEW POINTS ARE EXPECTED TO GRADUALLY SHIFT NWD AS A

WARM FRONT LIFTS INTO NRN AR THIS EVENING...INCREASING THE POTENTIAL

FOR SURFACE-BASED STORMS TO SPREAD INTO NRN AR.  VERTICAL WIND

PROFILES CONTINUE TO EXHIBIT VERY STRONG LOW LEVEL SHEAR WITH 0-1 KM

SRH VALUES AOA 300-400 M2/S2...WITH POTENTIAL FOR TORNADIC

SUPERCELLS TO DEVELOP THROUGH THE EVENING HOURS.



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 20045.





...WEISS

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