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WWUS20 KWNS 261950

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COZ000-NEZ000-WYZ000-270300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 223

NWS STORM PREDICTION CENTER NORMAN OK

150 PM MDT WED MAY 26 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEAST COLORADO

       THE WESTERN NEBRASKA PANHANDLE

       EASTERN WYOMING



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 150 PM UNTIL

900 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 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES WEST NORTHWEST OF

GILLETTE WYOMING TO 50 MILES SOUTH OF LIMON COLORADO.  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.



DISCUSSION...LOW-LEVEL MOISTURE CONTINUES TO SPREAD NWWD ACROSS THE

HIGH PLAINS AS SURFACE TEMPERATURES WARM WITH DAYTIME HEATING.

THESE PROCESSES HAVE CONTRIBUTED TO A MODERATELY UNSTABLE

ENVIRONMENT WITH WEAKENING CONVECTIVE INHIBITION...AS EVIDENCED BY

THE RECENT STORM DEVELOPMENT NEAR DENVER...AND OTHER DEEPENING

CUMULUS NEAR THE LARAMIE RANGE IN WY.  EXPECT STORM

COVERAGE/INTENSITY TO INCREASE THROUGH THE AFTERNOON...WITH VERTICAL

SHEAR SUFFICIENT FOR SLOW-MOVING SUPERCELLS WITH LARGE HAIL AND

DAMAGING WINDS.  ADDITIONALLY...LOW-LEVEL SHEAR WILL GRADUALLY

INCREASE BY THIS EVENING IN A SUFFICIENTLY MOIST ENVIRONMENT TO

SUPPORT THE THREAT FOR A FEW TORNADOES.



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 20015.





...THOMPSON

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