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WWUS20 KWNS 050142

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 46

NWS STORM PREDICTION CENTER NORMAN OK

840 PM CDT SUN APR 4 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF WEST CENTRAL ILLINOIS

       LARGE PART OF SOUTHERN EAST CENTRAL MISSOURI



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 840 PM UNTIL

200 AM 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES EAST OF

ALTON ILLINOIS TO 15 MILES NORTH NORTHWEST OF JOPLIN MISSOURI.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 45...



DISCUSSION...MOISTURE AND INSTABILITY HAVE INCREASED ACROSS SRN MO

THIS EVENING AHEAD OF DEVELOPING LINE OF STRONG/SEVERE

THUNDERSTORMS.  WITH 50KTK OF SHEAR AND STEEP MID LEVEL LAPSE RATES

COUPLED WITH MLCAPES AOA 1500 J/KG...POTENTIAL FOR LARGE HAIL AND

WIND DAMAGE WILL CONTINUE TO BE ASSOCIATED WITH THE LINE AS IT

MOVES/DEVELOPS E/SEWD,



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 450. MEAN STORM

MOTION VECTOR 25035.





...HALES

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