

000 

WWUS20 KWNS 071636

SEL8

SPC WW 071636

IAZ000-ILZ000-MIZ000-MNZ000-WIZ000-LSZ000-080300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 358

NWS STORM PREDICTION CENTER NORMAN OK

1135 AM CDT THU JUN 7 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF CENTRAL AND EASTERN IOWA

       SMALL PART OF NORTHWEST ILLINOIS

       PART OF WESTERN UPPER MICHIGAN

       PARTS OF SOUTHEASTERN MINNESOTA

       MUCH OF WESTERN AND NORTHERN WISCONSIN

       LAKE SUPERIOR



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1135 AM UNTIL

1000 PM CDT.



...THIS IS A PARTICULARLY DANGEROUS SITUATION...



DESTRUCTIVE TORNADOES...LARGE HAIL TO 2.5 INCHES IN DIAMETER...

THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE

POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHEAST OF

KENNEDY WISCONSIN TO 45 MILES SOUTH SOUTHWEST OF OTTUMWA IOWA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 357...



DISCUSSION...VERY STRONG SHEAR PROFILES IN PLACE ACROSS WATCH WITH

APPROACH OF VIGOROUS UPPER TROUGH AND DEEP SURFACE LOW.  AIR MASS

HAS BECOME STRONGLY UNSTABLE AND WEAKLY CAPPED.  SUPERCELL

THUNDERSTORMS WILL DEVELOP RAPIDLY ALONG W EDGE OF WATCH WHERE

MOISTURE/INSTABILITY GRADIENT LOCATED.  POTENTIAL EXISTS FOR

STRONG/LONG LIVED TORNADOES TO DEVELOP BY MID AFTERNOON ALONG WITH

VERY DAMAGING WINDS.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24050.





...HALES

