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035 

WWUS20 KWNS 042009

SEL8

SPC WW 042009

ILZ000-KSZ000-KYZ000-MOZ000-050300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 658

NWS STORM PREDICTION CENTER NORMAN OK

310 PM CDT TUE AUG 4 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR SOUTHERN ILLINOIS

       EXTREME SOUTHEAST KANSAS

       WESTERN KENTUCKY

       SOUTHERN MISSOURI



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 310 PM UNTIL

1000 PM CDT.



HAIL TO 2 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES SOUTH

SOUTHWEST OF JOPLIN MISSOURI TO 45 MILES SOUTH SOUTHEAST OF

EVANSVILLE INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 657...



DISCUSSION...SURFACE COLD FRONT WILL CONTINUE TO SETTLE SWD ACROSS

WW THROUGH THE EVENING INTO AN AXIS OF EXTREME INSTABILITY.  AREA

REMAINS ALONG FRINGE OF MODERATE NWLY FLOW ALOFT AND SHEAR WILL BE

SUPPORTIVE OF ORGANIZED LINES/CLUSTERS...AS WELL AS SUPERCELLS.

PRIMARY THREATS WILL BE FROM LARGE HAIL AND DAMAGING WINDS...AS WELL

AS HEAVY RAINFALL.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 33025.





...EVANS

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