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000 

WWUS20 KWNS 222008

SEL8

SPC WW 222008

KSZ000-NEZ000-230400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 288

NWS STORM PREDICTION CENTER NORMAN OK

305 PM CDT TUE MAY 22 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHWEST AND WEST CENTRAL KANSAS

       SOUTHWEST AND SOUTH CENTRAL NEBRASKA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 305 PM UNTIL

1100 PM 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 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES WEST NORTHWEST OF

BURWELL NEBRASKA TO 95 MILES SOUTH OF HILL CITY KANSAS.  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 287...



DISCUSSION...LARGE SCALE HEIGHT FALLS ARE BEGINNING TO SPREAD EWD

ACROSS ERN CO AT MID-AFTN.  COMBINATION OF HEATING AND THE

INCREASING UVV WILL ACT TO ERODE INHIBITION RESULTING IN CONVECTIVE

INITIATION BY LATE AFTN ALONG COLD FRONT/LEE-TROUGH.  VERTICAL SHEAR

WILL BE SUFFICIENT FOR SUPERCELLS WITH VERY LARGE HAIL.  LOW-LEVEL

SRH WILL ALSO BE CONDUCIVE FOR TORNADOES...PARTICULARLY ALONG THE

TRACK OF THE SFC LOW.



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 24025.





...RACY/EVANS

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