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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 589

NWS STORM PREDICTION CENTER NORMAN OK

405 PM CDT SUN AUG 8 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF NORTHEASTERN NEBRASKA

       SMALL PART OF SOUTHEAST SOUTH DAKOTA



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 405 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE

MILES EAST AND WEST OF A LINE FROM 10 MILES NORTH NORTHWEST OF

YANKTON SOUTH DAKOTA TO 30 MILES WEST SOUTHWEST OF NORFOLK

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 587...WW 588...



DISCUSSION...INTENSE SUPERCELLS HAVE DEVELOPED ACROSS NERN NEB IN

RESPONSE TO THE EXTREME INSTABILITY AND 40 KT OF SHEAR.  HAVE

UPGRADED PARTS OF THE ORIGINAL SEVERE WATCH AS POTENTIAL FOR NOT

ONLY VERY LARGE HAIL AND DAMAGING WINDS BUT TORNADOES WILL BE

POSSIBLE WITH THE SUPERCELLS AS THEY DEVELOP SLOWLY E/SE.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

600. MEAN STORM MOTION VECTOR 29020.





...HALES

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