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596 

WWUS20 KWNS 100245

SEL9

SPC WW 100245

NEZ000-SDZ000-WYZ000-100900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 289

NWS STORM PREDICTION CENTER NORMAN OK

945 PM CDT WED JUN 9 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       A LARGE  PART OF WESTERN NEBRASKA

       PARTS OF SOUTHWESTERN SOUTH DAKOTA

       PARTS OF EASTERN WYOMING



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 945 PM

UNTIL 400 AM 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 NORTH AND SOUTH OF A LINE FROM 50 MILES SOUTHWEST

OF DOUGLAS WYOMING TO 20 MILES EAST OF VALENTINE NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU9).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 288. WATCH NUMBER 288 WILL NOT BE IN EFFECT

AFTER 945 PM CDT.



DISCUSSION...ONGOING THUNDERSTORMS NEB PANHANDLE ALONG WITH

STRONG/SEVERE THUNDERSTORMS MOVING EASTWARD FROM SCENTRAL WY WILL

CONTINUE AND LIKELY INCREASE IN NUMBER AND INTENSITY NEXT SEVERAL

HOURS. WITH A VERY MOIST AND MDTLY UNSTABLE AIR MASS IN PLACE THE

INCREASING LOW LEVEL JET AND ARRIVAL OF LARGE SCALE ASCENT FROM

APPROACHING UPPER TROUGH SHOULD BE SUFFICIENT TO CONTINUE IF NOT

INCREASE THREAT OF LARGE HAIL AND DAMAGING WINDS ACROSS THE WATCH

AREA.



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 26035.





...HALES

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