

856 

WWUS20 KWNS 231911

SEL6

SPC WW 231911

IAZ000-ILZ000-INZ000-MOZ000-LMZ000-240200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 396

NWS STORM PREDICTION CENTER NORMAN OK

210 PM CDT WED JUN 23 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       A LARGE PART OF EASTERN IOWA

       NORTHERN ILLINOIS

       SMALL PART OF NORTHWEST INDIANA

       SMALL PART OF NORTHEAST MISSOURI MISSOURI

       LAKE MICHIGAN



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 210 PM UNTIL

900 PM CDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 90 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 130 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTHWEST OF

BURLINGTON IOWA TO 40 MILES EAST NORTHEAST OF ROCKFORD ILLINOIS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU6).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 395...



DISCUSSION...THUNDERSTORMS WILL RAPIDLY DEVELOP AND BECOME SEVERE

ACROSS ERN IA AHEAD OF COLD FRONT WHERE AIR MASS NOW EXTREMELY

UNSTABLE WITH MLCAPES TO 4000 J/KG. IN ADDITION VERY STRONG VEERING

WIND PROFILES SUPPORT SUPERCELLS INCLUDING LARGE HAIL AND TORNADO

THREAT.  STORMS WILL DEVELOP UPSCALE WITH ASSOCIATED POTENTIAL FOR

AN ORGANIZED DAMAGING WIND THREAT UNDER THE STRONG UPPER JET MOVING

ACROSS THE AREA WITH ACTIVITY MOVING ACROSS NRN IL.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 80 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

600. MEAN STORM MOTION VECTOR 24040.





...HALES

