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000 

WWUS20 KWNS 210926

SEL4

SPC WW 210926

IAZ000-ILZ000-INZ000-MOZ000-211700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 714

NWS STORM PREDICTION CENTER NORMAN OK

425 AM CDT MON JUL 21 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN IOWA

       CENTRAL AND NORTHERN ILLINOIS

       CENTRAL AND SOUTHERN INDIANA

       FAR NORTHEAST MISSOURI



EFFECTIVE THIS MONDAY MORNING FROM 425 AM UNTIL NOON CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST

OF CEDAR RAPIDS IOWA TO 40 MILES SOUTHEAST OF INDIANAPOLIS

INDIANA.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 713...



DISCUSSION...CNTRL IA FORWARD PROPAGATING MCS/BOW...AND WAA STORMS

IN ERN IA...EXPECTED TO CONTINUE GENERALLY ESE...REACHING IND TOWARD

15Z.  CONFLUENCE/WAA IN THE 850-700 MB LAYER...SFC-BASED INSTABILITY

AXIS OVER NRN MO...AND INFLOW FROM THE WSW SUGGEST THERE WILL BE

LITTLE OVERALL CHANGE IN CHARACTER OF CONVECTION.  BOWING SEGMENTS

SHOULD PERSIST...MAINTAINING A THREAT FOR DMGG WIND/MARGINALLY SVR

HAIL.



AVIATION...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 550. MEAN STORM

MOTION VECTOR 29045.





...CORFIDI

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