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000 

WWUS20 KWNS 101451

SEL0

SPC WW 101451

ARZ000-ILZ000-KYZ000-MOZ000-102200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 190

NWS STORM PREDICTION CENTER NORMAN OK

950 AM CDT THU APR 10 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       A LARGE PART OF NORTHEAST ARKANSAS

       PARTS OF SOUTHERN ILLINOIS

       PARTS OF WESTERN KENTUCKY

       PARTS OF SOUTHEASTERN MISSOURI



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 950 AM UNTIL

500 PM CDT.



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

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES EAST SOUTHEAST OF

LITTLE ROCK ARKANSAS TO 10 MILES EAST NORTHEAST OF CARBONDALE

ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 187...WW 189...



DISCUSSION...IMPRESSIVE SHEAR PROFILES ACROSS THE WATCH AREA AS THE

INTENSE UPPER SYSTEM APPROACHES FROM THE WEST.  AIR MASS WILL

CONTINUE TO DESTABILIZE AHEAD OF LINE OF STORMS FROM SERN MO TO SWRN

AR.  POTENTIAL FOR TORNADIC SUPERCELLS WILL INCREASE WITH DAYTIME

HEATING ALONG AND AHEAD OF THE LINE OF CONVECTION.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 22045.





...HALES

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