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000 

WWUS20 KWNS 112047

SEL2

SPC WW 112047

COZ000-NEZ000-SDZ000-120400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 382

NWS STORM PREDICTION CENTER NORMAN OK

250 PM MDT MON JUN 11 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHEAST COLORADO

       MUCH OF WESTERN NEBRASKA

       PARTS OF WESTERN SOUTH DAKOTA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 250 PM UNTIL

1000 PM MDT.



HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EAST AND WEST OF A LINE FROM 70 MILES NORTH OF

PHILIP SOUTH DAKOTA TO 50 MILES SOUTH SOUTHWEST OF IMPERIAL

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 380...WW 381...



DISCUSSION...THUNDERSTORMS DEVELOPING ALONG DRY LINE WHERE VERY

STEEP LAPSE RATES ARE PRESENT.  WITH MLCAPES AOA 2000 J/KG E OF DRY

LINE AND 25-30 KT OF SHEAR AVAILABLE...DAMAGING WINDS AND LARGE HAIL

WILL BE LIKELY WITH STRONGEST UPDRAFTS.  STORMS WILL DEVELOP

GRADUALLY EWD PRIOR TO WEAKENING AFTER SUNSET.



AVIATION...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 22020.





...HALES

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