

000 

WWUS20 KWNS 152328

SEL2

SPC WW 152328

NEZ000-160600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 522

NWS STORM PREDICTION CENTER NORMAN OK

630 PM CDT SUN JUL 15 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN NEBRASKA



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 630 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST

NORTHWEST OF NORFOLK NEBRASKA TO 25 MILES SOUTH SOUTHEAST OF

TEKAMAH 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.



OTHER WATCH INFORMATION...CONTINUE...WW 520...WW 521...



DISCUSSION...TSTM COMPLEX IN N CNTRL NEB APPEARS TO HAVE DEVELOPED A

LARGER SCALE CIRCULATION.  COUPLED WITH EXISTING DISTRIBUTION OF

SFC-BASED INSTABILITY E OF SYSTEM...AND PREVAILING NW FLOW

ALOFT...SETUP SUGGESTS A GENERAL E TO ESE DEVELOPMENT OF STRONGEST

ACTIVITY DURING THE NEXT SEVERAL HOURS.  ASSOCIATED STORMS WILL

CONTINUE TO POSE A THREAT FOR BOTH LARGE HAIL AND HIGH WIND.



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 30020.





...CORFIDI

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