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213 

WWUS20 KWNS 310146

SEL6

SPC WW 310146

IAZ000-MNZ000-NDZ000-SDZ000-310700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 406

NWS STORM PREDICTION CENTER NORMAN OK

845 PM CDT MON MAY 30 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHWESTERN IOWA

       WESTERN...CENTRAL AND NORTHERN MINNESOTA

       EXTREME EASTERN NORTH DAKOTA

       EASTERN SOUTH DAKOTA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 845 PM UNTIL

200 AM CDT.



TORNADOES...HAIL TO 2.5 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 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF

SIOUX FALLS SOUTH DAKOTA TO 70 MILES NORTHEAST OF THIEF RIVER

FALLS MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 402...TORNADO WATCH NUMBER 403. WATCH NUMBER 402 403

WILL NOT BE IN EFFECT AFTER 845 PM CDT. CONTINUE...WW 405...



DISCUSSION...THREAT WILL SHIFT NEWD ACROSS WW AREA THROUGH REMAINDER

EVENING FOR BOTH SIGNIFICANT CONVECTIVE WIND DAMAGE AND TORNADOES.

TORNADO POTENTIAL MAY EXIST EITHER WITH EMBEDDED

SUPERCELLS...BOW-ECHO MESOCIRCULATIONS OR LEADING-EDGE/QLCS SPINUPS.

 WARM SECTOR WILL SPREAD OVER MORE OF NRN MN WITH TIME...AHEAD OF

MCS...LEADING TO DESTABILIZATION OF NEAR-SFC AIR MASS.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

550. MEAN STORM MOTION VECTOR 22040.





...EDWARDS/HALES

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