

359 

WWUS20 KWNS 181508

SEL2

SPC WW 181508

IAZ000-ILZ000-182100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 462

NWS STORM PREDICTION CENTER NORMAN OK

1010 AM CDT THU JUN 18 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF EASTERN IOWA

       PARTS OF NORTHERN AND CENTRAL ILLINOIS



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 1010 AM UNTIL

400 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 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF

CEDAR RAPIDS IOWA TO 30 MILES NORTHEAST OF BLOOMINGTON ILLINOIS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 459...WW 460...WW 461...



DISCUSSION...FORWARD PROPAGATING THUNDERSTORM COMPLEX/BOW ECHO ERN

IA EXPECTED TO DEVELOP SEWD ALONG AND ON COOL SIDE OF BOUNDARY

EXTENDING ACROSS CENTRAL IL.  WIND DAMAGE WILL BE PRIMARY THREAT AND

WITH INCREASING DAY TIME INSTABILITY COULD BECOME MORE WIDESPREAD AS

COMPLEX TOWARD CENTRAL IL.



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 29030.





...HALES

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