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369 

WWUS20 KWNS 301908

SEL2

SPC WW 301908

MNZ000-NEZ000-SDZ000-310200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 402

NWS STORM PREDICTION CENTER NORMAN OK

210 PM CDT MON MAY 30 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME SOUTHWEST MINNESOTA

       CENTRAL AND NORTHEAST NEBRASKA

       SOUTHEAST SOUTH DAKOTA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 210 PM UNTIL 900

PM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHWEST OF

BROOKINGS SOUTH DAKOTA TO 40 MILES EAST SOUTHEAST OF MCCOOK

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...THUNDERSTORMS ARE EXPECTED TO DEVELOP SOON ALONG THE

COLD FRONT EXTENDING ACROSS CENTRAL NEB AND SOUTHEAST SD.  THESE

STORMS WILL TRACK QUICKLY NORTHEASTWARD ACROSS THE WATCH AREA

THROUGH EARLY EVENING.  INCREASINGLY STRONG SOUTHERLY LOW LEVEL

WINDS AHEAD OF THE STORMS AND MODERATE INSTABILITY WILL PROMOTE A

FEW SUPERCELL STORMS CAPABLE OF VERY LARGE HAIL AND TORNADOES.

OTHERWISE...EVOLUTION TO A SQUALL LINE IS EXPECTED WITH INCREASING

RISKS OF DAMAGING WINDS THROUGH THE EVENING.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24040.





...HART

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