

000 

WWUS20 KWNS 152130

SEL2

SPC WW 152130

NEZ000-160500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 692

NWS STORM PREDICTION CENTER NORMAN OK

430 PM CDT TUE JUL 15 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       A LARGE PART OF NEBRASKA



EFFECTIVE THIS TUESDAY AFTERNOON FROM 430 PM UNTIL MIDNIGHT CDT.



HAIL TO 2.5 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 50 MILES WEST OF

MULLEN NEBRASKA TO 40 MILES EAST NORTHEAST OF COLUMBUS 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.



DISCUSSION...WITH A VERY UNSTABLE AIR MASS IN PLACE AND LITTLE

REMAINING CINH...THUNDERSTORMS WILL INCREASE IN NUMBER AND

INTENSITY.  MLCAPES AOA 2500 J/KG AND STEEP MID LEVEL LAPSE RATES

SUPPORT LARGE HAIL AND AS COLD POOLS DEVELOP...DAMAGING WINDS WILL

BE LIKELY.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 28015.





...HALES

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