

000 

WWUS20 KWNS 011736

SEL1

SPC WW 011736

IAZ000-ILZ000-WIZ000-020000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 321

NWS STORM PREDICTION CENTER NORMAN OK

1235 PM CDT FRI JUN 1 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN IOWA

       NORTHWEST ILLINOIS

       SOUTHWEST WISCONSIN



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1235 PM UNTIL

700 PM CDT.



TORNADOES...HAIL TO 1.5 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 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF LONEROCK

WISCONSIN TO 60 MILES SOUTHEAST OF MOLINE ILLINOIS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU1).



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.



DISCUSSION...WELL-DEFINED MCV IN IA WILL LIFT NNEWD TOWARD WI THIS

AFTERNOON...WITH CONVECTIVE DEVELOPMENT EXPECTED TO INCREASE IN A

BROKEN ARC FROM NE TO SE OF THE MID LEVEL VORTICITY CENTER.

BOUNDARY LAYER DEWPOINTS HAVE INCREASED INTO THE UPPER 60S NEAR THE

MS RIVER IN ADVANCE OF THE DEVELOPING STORMS...WHILE VERTICAL SHEAR

IS QUITE FAVORABLE FOR SUPERCELLS IN A SMALL AREA E/NE OF THE MCV.

GIVEN THE INCREASING MOISTURE/MODERATE INSTABILITY AND STRONG

LOW-LEVEL SHEAR...ADDITIONAL SUPERCELLS AND TORNADOES CAN BE

EXPECTED THROUGH THE AFTERNOON.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 22035.





...THOMPSON

