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495 

WWUS20 KWNS 191534

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SPC WW 191534

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 494

NWS STORM PREDICTION CENTER NORMAN OK

1035 AM CDT MON JUL 19 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL ILLINOIS

       CENTRAL MISSOURI



EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 1035 AM UNTIL

500 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 80

STATUTE MILES EITHER SIDE OF A LINE FROM 30 MILES WEST OF VICHY

MISSOURI TO 50 MILES EAST SOUTHEAST OF SPRINGFIELD ILLINOIS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



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.



DISCUSSION...AN INCREASING BAND OF THUNDERSTORMS EXTENDS FROM

CENTRAL MO INTO WEST CENTRAL IL.  THIS ACTIVITY IS EXPECTED TO

INTENSIFY EARLY THIS AFTERNOON AND POSE A RISK OF LOCALLY DAMAGING

WINDS ACROSS THE WATCH AREA.  VERY MOIST/UNSTABLE AIR MASS OVER

SOUTHWEST MO WILL ALSO FAVOR BACKBUILDING OF LINE INTO THAT REGION.



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 31030.





...HART

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