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192 

WWUS20 KWNS 262149

SEL8

SPC WW 262149

IAZ000-NEZ000-SDZ000-270500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 418

NWS STORM PREDICTION CENTER NORMAN OK

450 PM CDT SAT JUN 26 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHWEST IOWA

       CENTRAL AND NORTHEAST NEBRASKA

       SOUTHEAST SOUTH DAKOTA



EFFECTIVE THIS SATURDAY AFTERNOON FROM 450 PM UNTIL MIDNIGHT 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 65 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH SOUTHWEST OF

AINSWORTH NEBRASKA TO 15 MILES EAST NORTHEAST OF DENISON IOWA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 415...WW 416...WW 417...



DISCUSSION...THUNDERSTORMS ARE EXPECTED TO RAPIDLY INTENSIFY THIS

AFTERNOON OVER NORTHEAST AND CENTRAL NEB AND MOVE EASTWARD THROUGH

THE EVENING ACROSS THE WATCH AREA.  EXTREMELY MOIST AND UNSTABLE

CONDITIONS COMBINED WITH SUFFICIENT EFFECTIVE SHEAR WILL PROMOTE THE

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

ISOLATED TORNADOES.



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 27035.





...HART

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