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000 

WWUS20 KWNS 270204

SEL5

SPC WW 270204

NEZ000-SDZ000-WYZ000-270900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 755

NWS STORM PREDICTION CENTER NORMAN OK

805 PM MDT SAT JUL 26 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NEBRASKA PANHANDLE

       WESTERN AND CENTRAL SOUTH DAKOTA

       EXTREME SOUTHEAST WYOMING



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 805 PM

UNTIL 300 AM MDT.



HAIL TO 2 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHWEST OF

MOBRIDGE SOUTH DAKOTA TO 30 MILES SOUTH SOUTHWEST OF ALLIANCE

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 753...WW 754...



DISCUSSION...AREAS OF HIGH-BASED CONVECTION NOW DEVELOPING EAST INTO

ZONE OF MUCH STRONGER INSTABILITY AND A PERIOD OF SUSTAINED ASCENT

AND MASS INFLOW ON STRENGTHENING SLY LOW LEVEL JET. ACTIVITY APPEARS

TO BE ENCOUNTERING MORE FAVORABLE REGIME BASED ON LATEST RADAR

TRENDS AND EXPECT ONE OR TWO CLUSTERS TO CONTINUE TO POSE A THREAT

OF HIGH WINDS AND LARGE HAIL WHILE SPREADING SEWD INTO LLJ...AND

ALONG INSTABILITY AXIS THROUGH LATE TONIGHT.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

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

MOTION VECTOR 28035.





...CARBIN

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