

000 

WWUS20 KWNS 071900

SEL9

SPC WW 071900

IAZ000-ILZ000-080100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 479

NWS STORM PREDICTION CENTER NORMAN OK

205 PM CDT SAT JUN 7 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN IOWA

       NORTHERN ILLINOIS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 205 PM UNTIL

800 PM CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTHEAST OF MOLINE

ILLINOIS TO 20 MILES NORTH OF JANESVILLE WISCONSIN.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU9).



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 478...



DISCUSSION...ISOLATED THUNDERSTORMS HAVE BEGUN TO FORM ALONG MS

RIVER AND MOVE INTO WEST CENTRAL IL.  THESE STORMS ARE DEVELOPING IN

A VERY UNSTABLE AIRMASS WHERE LOW AND DEEP LAYER SHEAR WILL FAVOR

SUPERCELL STRUCTURES.  ISOLATED TORNADOES...ALONG WITH DAMAGING

WINDS AND HAIL WILL BE POSSIBLE THROUGH THE AFTERNOON.



AVIATION...TORNADOES AND 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 25035.





...HART

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