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WWUS20 KWNS 031718

SEL7

SPC WW 031718

MNZ000-WIZ000-040100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 477

NWS STORM PREDICTION CENTER NORMAN OK

1210 PM CDT TUE JUL 3 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN AND EASTERN MINNESOTA

       WESTERN WISCONSIN



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1210 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 100 STATUTE

MILES EAST AND WEST OF A LINE FROM 115 MILES NORTH NORTHWEST OF

EAU CLAIRE WISCONSIN TO 30 MILES SOUTH SOUTHWEST OF ROCHESTER

MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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...TSTMS ARE FORMING IN CNTRL MN ALONG LEADING EDGE OF

ARCHED OUTFLOW BOUNDARY FROM OVERNIGHT MCS IN SD...WITH ACTIVITY

POSSIBLY BEING ENHANCE BY APPARENT MCV NEAR STC.  STRONG HEATING AND

RICH LOW LEVEL MOISTURE INFLOW AHEAD OF BOUNDARY/MCV WILL YIELD

SUBSTANTIAL DESTABILIZATION OVER MUCH OF WW LATER TODAY.  WHILE

CURRENT WIND FIELD IS RATHER MODEST...SPEED/DIRECTIONAL SHEAR

EXPECTED TO INCREASE WITH TIME.  RESULTING SETUP COULD SUPPORT A FEW

SUPERCELLS WITH A THREAT FOR TORNADOES...IN ADDITION TO MORE

NUMEROUS STORMS WITH HAIL/WIND.



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 28025.





...CORFIDI

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