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000 

WWUS20 KWNS 182305

SEL5

SPC WW 182305

NEZ000-190600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 535

NWS STORM PREDICTION CENTER NORMAN OK

600 PM CDT WED JUL 18 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN NEBRASKA



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 600 PM

UNTIL 100 AM CDT.



HAIL TO 2.5 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 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTH

NORTHWEST OF ALLIANCE NEBRASKA TO 20 MILES EAST SOUTHEAST OF

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 529...WW 531...WW

532...WW 533...WW 534...



DISCUSSION...STRONG...SUSTAINED AND RELATIVELY HIGH-BASED STORMS

POSING A THREAT FOR HIGH WIND AND HAIL MAY CONTINUE TO DEVELOP INVOF

LEE TROUGH SEGMENT OVER NW NEB THROUGH EARLY EVENING.  OTHER STORMS

MAY DEVELOP EWD WITH TIME ALONG WARM ADVECTION ZONE/WEAK FRONTAL

SEGMENT EXTENDING E INTO THE N CNTRL/NE NEB...ESPECIALLY AS LLJ

STRENGTHENS TOWARD SUNSET.  IN THIS REGION...A CONDITIONAL THREAT

FOR SUPERCELLS WITH LARGE HAIL AND DAMAGING WIND WILL EXIST THROUGH

LATE TONIGHT.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

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

MOTION VECTOR 29015.





...CORFIDI

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