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543 

WWUS20 KWNS 181843

SEL5

SPC WW 181843

COZ000-190300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 185

NWS STORM PREDICTION CENTER NORMAN OK

145 PM CDT TUE MAY 18 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF EASTERN COLORADO



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 145 PM UNTIL

1000 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 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 65 MILES NORTHEAST OF FORT

COLLINS COLORADO TO 35 MILES WEST SOUTHWEST OF SPRINGFIELD

COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...THUNDERSTORMS EXPECTED TO INCREASE QUICKLY THIS

AFTERNOON IN NUMBER AND INTENSITY ACROSS THE WATCH AREA WITH THE

APPROACH OF UPR TROUGH AND VERY FAVORABLE SHEAR PROFILES IN PLACE.

WITH HEATING THE AIR MASS IS NOW MDTLY UNSTABLE...MLCAPES TO 1200

J/KG.  MOST FAVORED AREAS INITIALLY FOR SUPERCELLS AND

TORNADOES/LARGE HAIL WILL BE ASSOCIATED WITH THE SURFACE CONVERGENCE

N OF PALMER DIVIDE. SUPERCELLS WILL BECOME MORE COMMON THRU

AFTERNOON AS ACTIVITY BUILDS EWD ACROSS THE WATCH.  PRIMARY THREAT

WILL BE LARGE HAIL AND AT LEAST ISOLATED TORNADOES.



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 26025.





...HALES

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