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934 

WWUS20 KWNS 062207

SEL8

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IAZ000-WIZ000-LMZ000-070400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 58

NWS STORM PREDICTION CENTER NORMAN OK

505 PM CDT TUE APR 6 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHEAST IOWA

       SOUTHERN WISCONSIN

       LAKE MICHIGAN



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 505 PM UNTIL

1100 PM CDT.



HAIL TO 2.5 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 35

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 95 MILES WEST OF

LONEROCK WISCONSIN TO 10 MILES EAST NORTHEAST OF MILWAUKEE

WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 56...WW 57...



DISCUSSION...SEVERE THUNDERSTORMS EXPECTED TO DEVELOP ALONG AND N OF

WARM FRONT WHICH EXTENDS EWD ALONG WI/IL BORDER.  WITH STRONG DEEP

LAYER SHEAR AND ELEVATED INSTABILITY...SUPERCELLS ARE LIKELY WITH

PRIMARY THREAT LARGE HAIL.  WIND DAMAGE POTENTIAL WILL ALSO BE

POSSIBLE...PARTICULARLY GIVEN FAST STORM MOVEMENT PARTICULARLY WITH

ANY LINE SEGMENTS THAT ARE ABLE TO DEVELOP.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 24035.





...HALES

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