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WWUS20 KWNS 200544

SEL0

SPC WW 200544

NEZ000-201000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 520

NWS STORM PREDICTION CENTER NORMAN OK

1245 AM CDT MON JUN 20 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST NEBRASKA



EFFECTIVE THIS MONDAY MORNING FROM 1245 AM UNTIL 500 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 30 MILES WEST

SOUTHWEST OF MCCOOK NEBRASKA TO 40 MILES EAST NORTHEAST OF

IMPERIAL NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 515...WW 516...WW

517...WW 518...WW 519...



DISCUSSION...A CLUSTER OF SEVERE THUNDERSTORMS OVER NORTHEAST CO

WILL CONTINUE TO TRACK EASTWARD INTO SOUTHWEST NEB EARLY THIS

MORNING.  BACKED LOW LEVEL WINDS AND MODERATE ELEVATED INSTABILITY

WILL MAINTAIN A RISK OF LOCALLY DAMAGING WINDS AND LARGE HAIL FOR A

FEW MORE HOURS.



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 450. MEAN STORM

MOTION VECTOR 27035.





...HART

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