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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 474

NWS STORM PREDICTION CENTER NORMAN OK

225 PM CDT TUE AUG 6 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  CENTRAL MINNESOTA

  SOUTHEASTERN NORTH DAKOTA

  NORTHWESTERN WISCONSIN



* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 225 PM UNTIL

  900 PM CDT.



* PRIMARY THREATS INCLUDE...

  A FEW TORNADOES POSSIBLE

  SEVERAL LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL

    EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTH NORTHWEST OF

ORTONVILLE MINNESOTA TO 60 MILES EAST NORTHEAST OF MINNEAPOLIS

MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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...AS A 50+ KT WESTERLY 500 MB JET STREAK CONTINUES TO

NOSE EASTWARD ACROSS THE NORTHERN PLAINS/UPPER MISSISSIPPI VALLEY

REGION LATE THIS AFTERNOON...DESTABILIZATION IS EXPECTED TO BECOME

SUFFICIENT FOR SUPERCELL DEVELOPMENT IN THE WARM SECTOR OF A WEAK

SURFACE WAVE.  WITH SOME STRENGTHENING OF SOUTHERLY LOW-LEVEL FLOW

FIELDS...A REMNANT EFFECTIVE WARM FRONTAL ZONE ACROSS CENTRAL

MINNESOTA INTO THE MINNEAPOLIS AREA WILL PROVIDE A POTENTIAL FOCUS

FOR TORNADIC DEVELOPMENT THROUGH EARLY EVENING.  OTHERWISE...THE

EVOLUTION OF AN ORGANIZED MESOSCALE CONVECTIVE SYSTEM MAY EVENTUALLY

OCCUR NEAR THE LOW AND ALONG A DEVELOPING COLD FRONT TRAILING TO THE

WEST...WHICH SHOULD PROPAGATE EAST SOUTHEASTWARD WITH THE RISK FOR

SEVERE WINDS AND HAIL ACROSS THE UPPER MISSISSIPPI VALLEY BY THIS

EVENING.



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

450. MEAN STORM MOTION VECTOR 29035.





...KERR

