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WWUS20 KWNS 012313

SEL9

SPC WW 012313

NEZ000-020600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 879

NWS STORM PREDICTION CENTER NORMAN OK

515 PM MDT MON SEP 1 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST AND NORTH-CENTRAL NEBRASKA



EFFECTIVE THIS MONDAY AFTERNOON FROM 515 PM UNTIL MIDNIGHT MDT.



HAIL TO 1.5 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 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST OF

ALLIANCE NEBRASKA TO 20 MILES NORTH NORTHEAST OF BURWELL

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...CONTINUE...WW 878...



DISCUSSION...POTENT SHORT WAVE TROUGH EXPECTED TO DRIVE ORGANIZED

STORM DEVELOPMENT IN THE FORM OF LINEAR MCS ACROSS PORTIONS OF NRN

NEBRASKA THROUGH THIS EVENING. BOWING SEGMENT NOW COMING OUT OF

SCOTTS BLUFF AREA HAS ALREADY PRODUCED A WIND GUST TO 70KT. THIS

ACTIVITY SHOULD CONTINUE TO SPREAD ENEWD WITH STORM INFLOW AND

MESOSCALE FORCING BEING ENHANCED BY TRAILING PORTION OF THE FRONTAL

BOUNDARY EXTENDING ENEWD FROM NCNTRL NEBRASKA INTO SD. STORM

COVERAGE MAY ALSO INCREASE AS STRONGER LARGE SCALE ASCENT WITH THE

UPPER TROUGH BEGINS TO SPREAD EAST ACROSS LOW LEVEL MOISTURE PLUME.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 24035.





...CARBIN

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