

912 

WWUS20 KWNS 132251

SEL0

SPC WW 132251

NEZ000-SDZ000-140500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 580

NWS STORM PREDICTION CENTER NORMAN OK

550 PM CDT MON JUL 13 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND WEST CENTRAL NEBRASKA

       SOUTHEAST SOUTH DAKOTA



EFFECTIVE THIS MONDAY AFTERNOON FROM 550 PM UNTIL MIDNIGHT CDT.



HAIL TO 3 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 NORTH AND SOUTH OF A LINE FROM 15 MILES SOUTHEAST

OF MITCHELL SOUTH DAKOTA TO 80 MILES WEST SOUTHWEST OF MULLEN

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 577...WW 578...WW 579...



DISCUSSION...ISOLATED SUPERCELL STORMS ARE TRACKING SOUTHEASTWARD

ACROSS SD...WHILE OTHER SCATTERED INTENSE STORMS MOVE EASTWARD

ACROSS WESTERN NEB.  THIS WILL RESULT IN SEVERAL AREAS OF STRONG TO

SEVERE STORMS ACROSS THE WATCH AREA THROUGH THE EVENING.  LARGE HAIL

IS THE MAIN THREAT...BUT LOCALLY DAMAGING WINDS ARE ALSO POSSIBLE IN

THE MOST INTENSE STORMS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 30025.





...HART

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