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WWUS20 KWNS 080109

SEL3

SPC WW 080109

ARZ000-INZ000-KYZ000-MSZ000-OHZ000-TNZ000-080700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 633

NWS STORM PREDICTION CENTER NORMAN OK

810 PM CDT FRI SEP 7 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN ARKANSAS

       SOUTHEAST INDIANA

       CENTRAL KENTUCKY

       NORTHERN MISSISSIPPI

       CENTRAL AND SOUTHERN OHIO

       MIDDLE AND WEST TENNESSEE



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 810 PM

UNTIL 200 AM CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90

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

NORTHWEST OF COLUMBUS OHIO TO 20 MILES SOUTHWEST OF OXFORD

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 630...WW 631...WW 632...



DISCUSSION...A LARGE SQUALL LINE EXTENDS FROM CENTRAL IND

SOUTHWESTWARD INTO CENTRAL AR.  SEVERAL EMBEDDED BOWING STRUCTURES

ALONG THE LINE ARE POSING A RISK OF LOCALLY DAMAGING WINDS.  STRONG

INSTABILITY AHEAD OF THE LINE...COUPLED WITH THE APPROACHING UPPER

TROUGH WILL MAINTAIN A RISK OF GUSTY/DAMAGING WINDS AND HAIL IN THE

STRONGER STORMS FOR SEVERAL MORE HOURS.



AVIATION...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 29035.





...HART

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