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000 

WWUS20 KWNS 012028

SEL7

SPC WW 012028

NEZ000-SDZ000-WYZ000-020400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 417

NWS STORM PREDICTION CENTER NORMAN OK

230 PM MDT SUN JUN 1 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NEBRASKA PANHANDLE

       FAR SOUTHWEST SOUTH DAKOTA

       EASTERN WYOMING



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 230 PM UNTIL

1000 PM MDT.



TORNADOES...HAIL TO 2.5 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 85 STATUTE

MILES EAST AND WEST OF A LINE FROM 95 MILES NORTH NORTHEAST OF

DOUGLAS WYOMING TO 5 MILES SOUTH SOUTHEAST OF SIDNEY 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 415...WW 416...



DISCUSSION...SEVERE THUNDERSTORMS...INCLUDING POTENTIAL FOR

LONGER-LIVED SUPERCELLS...WILL DEVELOP AND SPREAD ESEWD ACROSS WW

THIS EVENING.  AIR MASS IS ALREADY MODERATELY UNSTABLE WITH

EFFECTIVE SHEAR NEAR 50 KT.  STORMS WILL BE CAPABLE OF LARGE

HAIL...WITH ISOLATED TORNADO THREAT INCREASING THROUGH THE EARLY

EVENING AS SELY LOW LEVEL FLOW STRENGTHENS OVER SERN WY/NEB

PANHANDLE.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 28020.





...EVANS

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