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000 

WWUS20 KWNS 221729

SEL4

SPC WW 221729

COZ000-NEZ000-WYZ000-230200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 334

NWS STORM PREDICTION CENTER NORMAN OK

1125 AM MDT THU MAY 22 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEASTERN COLORADO

       EXTREME SOUTHWESTERN NEBRASKA

       EXTREME SOUTHEASTERN WYOMING



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1125 AM UNTIL

800 PM MDT.



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 70 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 20 MILES WEST SOUTHWEST OF

FORT COLLINS COLORADO TO 30 MILES NORTH NORTHEAST OF BURLINGTON

COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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.



DISCUSSION...NUMEROUS THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS

NORTHEASTERN CO THIS AFTERNOON...AS STRONG SHORTWAVE TROUGH MOVES

NEWD INTO THE AREA. DEEP LAYER SHEAR AT 60 KT AND MODERATE

INSTABILITY INDICATES NUMEROUS SUPERCELLS ARE LIKELY. STRONG

INSTABILITY WILL SUPPORT HAIL IN EXCESS OF 2 INCHES. THE PRESENCE OF

A WARM FRONT AND STRONG LOW LEVEL SHEAR SUGGEST TORNADOES ARE ALSO

LIKELY. INITIAL STORMS NEAR THE FRONT RANGE WILL GRADUALLY SPREAD

EWD INTO THE EASTERN PLAINS THROUGH THE EARLY EVENING HOURS.



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

500. MEAN STORM MOTION VECTOR 17035.





...IMY

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