

000 

WWUS20 KWNS 240009

SEL3

SPC WW 240009

COZ000-NEZ000-SDZ000-WYZ000-240600-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 343

NWS STORM PREDICTION CENTER NORMAN OK

605 PM MDT FRI MAY 23 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEAST COLORADO

       WESTERN NEBRASKA

       SOUTHWEST SOUTH DAKOTA

       EASTERN WYOMING



EFFECTIVE THIS FRIDAY NIGHT FROM 605 PM UNTIL MIDNIGHT MDT.



TORNADOES...HAIL TO 1.5 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 30 MILES WEST SOUTHWEST OF IMPERIAL NEBRASKA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 340. WATCH NUMBER 340 WILL NOT BE IN EFFECT AFTER

605 PM MDT. CONTINUE...WW 341...WW 342...



DISCUSSION...TSTMS WITH LOW-LEVEL ROTATION EXPECTED TO PERSIST ALONG

NNW/SSE-ORIENTED CONFLUENCE LINE THAT NOW EXTENDS FROM E CNTRL CO

INTO ERN WY.  THE LINE SHOULD EDGE SLOWLY N LATER THIS EVENING AS

COLD FRONT...ASSOCIATED WITH UPR IMPULSE NOW ROTATING NNE INTO ERN

CO...CONTINUES NNEWD AND MERGES WITH IT.  CONTINUED NNE MOTION OF

UPR IMPULSE...AND STRONG/FAIRLY MOIST ESE LOW-LVL FLOW AHEAD OF

CONFLUENCE LINE...SUGGEST POTENTIAL FOR INCREASING STORM COVERAGE/

POSSIBLE TORNADOES THIS EVENING IN WW AREA.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

450. MEAN STORM MOTION VECTOR 18035.





...CORFIDI

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