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WWUS20 KWNS 201909

SEL0

SPC WW 201909

ILZ000-INZ000-KYZ000-210100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 710

NWS STORM PREDICTION CENTER NORMAN OK

210 PM CDT SUN JUL 20 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF EASTERN ILLINOIS

       PARTS OF CENTRAL AND SOUTHERN INDIANA

       SMALL PART OF NORTHERN KENTUCKY



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 210 PM UNTIL 800

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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES SOUTHWEST

OF DECATUR ILLINOIS TO 90 MILES EAST SOUTHEAST OF INDIANAPOLIS

INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 708...WW 709...



DISCUSSION...A VERY WARM AND UNSTABLE AIR MASS NOW IN PLACE ACROSS

THE WATCH AREA.  WITH 30-35KT OF SHEAR AND MLCAPES TO 3000

J/KG...STORMS EXPECTED TO INCREASE IN NUMBER AND INTENSITY.  WIND

DAMAGE WILL BE THE PRIMARY THREAT AS STORMS DEVELOP INTO LINE

SEGMENTS AND MULTICELL CLUSTERS.



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 550. MEAN STORM

MOTION VECTOR 29030.





...HALES

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