

618 

WWUS20 KWNS 032258

SEL3

SPC WW 032258

NEZ000-SDZ000-040500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 253

NWS STORM PREDICTION CENTER NORMAN OK

600 PM CDT THU JUN 3 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST NEBRASKA

       EASTERN SOUTH DAKOTA



EFFECTIVE THIS THURSDAY NIGHT FROM 600 PM UNTIL MIDNIGHT CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTHEAST OF

ABERDEEN SOUTH DAKOTA TO 35 MILES WEST SOUTHWEST OF COLUMBUS

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 250...WW 251...WW 252...



DISCUSSION...THUNDERSTORM DEVELOPMENT IS UNDERWAY ON THE NOSE OF THE

STRONGER SURFACE HEATING IN CENTRAL NEB...AND ADDITIONAL STORMS WILL

DEVELOP IN THE NEXT FEW HOURS NWD INTO SD.  THE CONVECTION WILL BE

FOCUSED BY THE EWD PROGRESSION OF A SURFACE LOW/TROUGH AND MIDLEVEL

TROUGH FROM NRN HIGH PLAINS.  THOUGH AN ISOLATED TORNADO CANNOT BE

RULED OUT FOR A FEW HOURS THIS EVENING...THE SOMEWHAT MARGINAL

LOW-LEVEL MOISTURE SUGGESTS THAT LARGE HAIL AND DAMAGING WINDS WILL

BE THE PRIMARY SEVERE THREATS.  BY EARLY TONIGHT...THERE WILL ALSO

BE THE POTENTIAL FOR UPSCALE GROWTH INTO ONE OR MORE THUNDERSTORM

CLUSTERS.



AVIATION...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 500. MEAN STORM

MOTION VECTOR 28025.





...THOMPSON

