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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 493

NWS STORM PREDICTION CENTER NORMAN OK

535 PM CDT FRI JUN 17 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN MINNESOTA

       EASTERN NORTH DAKOTA

       NORTHEAST SOUTH DAKOTA



EFFECTIVE THIS FRIDAY AFTERNOON AND SATURDAY MORNING FROM 535 PM

UNTIL 100 AM CDT.



TORNADOES...HAIL TO 1.5 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 40 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTHEAST OF

WATERTOWN SOUTH DAKOTA TO 70 MILES NORTHWEST OF FARGO NORTH

DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 490...WW 491...WW 492...



DISCUSSION...TSTMS FORMING ALONG/JUST AHEAD OF WEAK COLD FRONT IN

ERN PORTIONS OF THE DAKOTAS EXPECTED TO CONTINUE MOVING NEWD AS

REGION COMES UNDER INCREASING ASCENT ASSOCIATED WITH SHORTWAVE

IMPULSE ROTATING NE INTO WRN ND.  COMBINATION OF LOW LVL VEERING

WIND PROFILES /WITH MODERATE SHEAR MAGNITUDES/...RELATIVELY MOIST

LOW TO MID LVL ENVIRONMENT...AND THE PROSPECT FOR ADDITIONAL SFC

HEATING/SEMI DISCRETE STORM DEVELOPMENT SUGGEST THE POTENTIAL FOR

TORNADOES... IN ADDITION TO HAIL AND PERHAPS LOCALLY DMG WIND.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 22025.





...CORFIDI

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