WATCHES: Tornado Watch Number 589

WWUS20 KWNS 082105
SEL9
SPC WW 082105
NEZ000-SDZ000-090300-

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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