WATCHES: Severe Thunderstorm Watch Number 462

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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