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344 

WWUS20 KWNS 112135

SEL7

SPC WW 112135

NEZ000-120500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 767

NWS STORM PREDICTION CENTER NORMAN OK

435 PM CDT THU AUG 11 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN NEBRASKA



EFFECTIVE THIS THURSDAY AFTERNOON FROM 435 PM UNTIL MIDNIGHT CDT.



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

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 35 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 80 MILES WEST NORTHWEST OF

MULLEN NEBRASKA TO 20 MILES EAST NORTHEAST OF ONEILL NEBRASKA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 766...



DISCUSSION...ISOLATED SUPERCELL THUNDERSTORMS ARE TRACKING

SOUTHEASTWARD ACROSS SD...AND WILL BEGIN AFFECTING PORTIONS OF THE

WATCH AREA IN THE NEXT 1-2 HOURS.  MEANWHILE...INCREASING CU FIELD

MAY ALSO RESULT IN AN ISOLATED STORM OR TWO TO FORM OVER NORTHERN

NEB THIS EVENING.  STRONG VERTICAL SHEAR AND AMPLE CAPE WILL SUPPORT

A RISK OF SUPERCELLS CAPABLE OF VERY LARGE HAIL AND DAMAGING WINDS.

STRENGTHENING LOW LEVEL WIND FIELDS DURING THE EVENING ALSO INDICATE

A RISK OF ISOLATED TORNADOES.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 30025.





...HART

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