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WWUS20 KWNS 112040

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SPC WW 112040

ARZ000-ILZ000-KSZ000-KYZ000-MOZ000-TNZ000-120400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 455

NWS STORM PREDICTION CENTER NORMAN OK

340 PM CDT SUN JUL 11 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR NORTHEAST ARKANSAS

       SOUTHERN ILLINOIS

       FAR EASTERN KANSAS

       FAR WESTERN KENTUCKY

       CENTRAL AND SOUTHERN MISSOURI

       NORTHWEST TENNESSEE



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 340 PM UNTIL

1100 PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTH

NORTHWEST OF JOPLIN MISSOURI TO 35 MILES EAST SOUTHEAST OF

PADUCAH KENTUCKY.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 450...TORNADO WATCH NUMBER 451.

WATCH NUMBER 450 451 WILL NOT BE IN EFFECT AFTER 340 PM CDT.

CONTINUE...WW 452...WW 453...WW 454...



DISCUSSION...EVOLVING BOW ECHO IS EXPECTED TO CONTINUE SEWD AT 40-45

KT ALONG SRN FRINGE OF MIDLEVEL TROUGH PROGRESSING TOWARD THE MID MS

VALLEY.  AMBIENT INFLOW AIR MASS IS HOT AND VERY MOIST WITH MLCAPE

OF 2000-2500 J/KG. WHEN COUPLED WITH 40-50 KT OF DEEP WNWLY

SHEAR...ENVIRONMENT WILL REMAIN SUPPORTIVE OF EMBEDDED SUPERCELL AND

BOWING STRUCTURES WITH THE PRIMARY HAZARDS BEING DESTRUCTIVE WINDS

AND HAIL.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 29040.





...MEAD

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