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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 617

NWS STORM PREDICTION CENTER NORMAN OK

230 PM CDT SUN JUL 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WEST CENTRAL MINNESOTA

       SOUTHEAST NORTH DAKOTA

       NORTHERN SOUTH DAKOTA



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 230 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 3 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 70 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTH OF MOBRIDGE

SOUTH DAKOTA TO 40 MILES NORTH NORTHEAST OF ORTONVILLE 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.



OTHER WATCH INFORMATION...CONTINUE...WW 616...



DISCUSSION...INTENSE THUNDERSTORMS CONTINUE TO STRENGTHEN OVER

SOUTHERN ND.  OTHER STORMS MAY FORM IN THE NEXT FEW HOURS OVER

NORTHERN SD.  THIS ACTIVITY WILL PROGRESS EASTWARD ACROSS THE WATCH

AREA THROUGH THE AFTERNOON AND EARLY EVENING.  LOW LEVEL FLOW IS NOT

PARTICULARLY STRONG.  HOWEVER...CONSIDERABLE VEERING OF WINDS WITH

HEIGHT...STRONG INSTABILITY...FAVORABLE DEEP LAYER SHEAR...AND

STRONG SUPERCELL STRUCTURES ON RADAR WARRANT RISK OF A FEW

TORNADOES.  VERY LARGE HAIL AND DAMAGING WINDS ARE ALSO A CONCERN.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 28035.





...HART

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