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000 

WWUS20 KWNS 220022

SEL0

SPC WW 220022

ILZ000-INZ000-220800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 720

NWS STORM PREDICTION CENTER NORMAN OK

720 PM CDT MON JUL 21 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL ILLINOIS

       CENTRAL INDIANA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 720 PM UNTIL

300 AM CDT.



HAIL TO 3 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 55 MILES WEST

SOUTHWEST OF PEORIA ILLINOIS TO 45 MILES EAST 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 718...WW 719...



DISCUSSION...VERY ACTIVE NIGHT EXPECTED ACROSS THIS REGION AS AIR

MASS REMAINS EXTREMELY UNSTABLE AND UNCAPPED.  AREA WILL BE SKIRTED

BY STRONG SHORTWAVE TROUGH MOVING ACROSS THE NRN MS RIVER

VALLEY...ENHANCING COVERAGE OF THUNDERSTORMS.  GIVEN DEGREE OF

INSTABILITY AND 35-45 KT WNWLY DEEP LAYER SHEAR...EXPECT COMBINATION

OF SUPERCELLS AND BOW ECHOES WILL OVERSPREAD THE REGION THROUGH LATE

TONIGHT.  LARGER MCS WILL LIKELY EVOLVE AND POSSIBLY PRODUCE

WIDESPREAD DAMAGING WINDS AND LARGE HAIL.



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

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29035.





...EVANS

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