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WWUS20 KWNS 242346

SEL8

SPC WW 242346

NEZ000-SDZ000-250600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 548

NWS STORM PREDICTION CENTER NORMAN OK

650 PM CDT FRI JUN 24 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN NEBRASKA

       CENTRAL SOUTH DAKOTA



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 650 PM

UNTIL 100 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 130 MILES NORTH OF

PHILIP SOUTH DAKOTA TO 45 MILES SOUTHWEST OF MULLEN NEBRASKA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 544...WW 546...WW 547...



DISCUSSION...CLUSTERS OF STORMS IN NE WY AND THE NEB PANHANDLE WILL

LIKELY PERSIST AND SPREAD EWD/ESEWD THROUGH EARLY TONIGHT.  THE

CONVECTION WILL BE MAINTAINED BY MODERATE INSTABILITY AND SUFFICIENT

DEEP-LAYER SHEAR FOR SUPERCELLS/BOWS...WHILE DAMAGING WINDS AND HAIL

WILL BE THE MAIN CONCERNS.



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 27030.





...THOMPSON

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