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WWUS20 KWNS 241826

SEL8

SPC WW 241826

COZ000-KSZ000-250300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 358

NWS STORM PREDICTION CENTER NORMAN OK

125 PM CDT TUE MAY 24 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN COLORADO

       WESTERN KANSAS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 125 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 2 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 80 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 5 MILES NORTH OF LAMAR

COLORADO TO 60 MILES SOUTH OF RUSSELL KANSAS.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU8).



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 354...WW 355...WW

356...WW 357...



DISCUSSION...DEEP-LAYER FORCING FOR ASCENT ATTENDANT TO NEGATIVELY

TILTED SHORTWAVE TROUGH EMERGING INTO THE HIGH PLAINS WILL SUPPORT A

CONTINUED INCREASE IN STORMS COVERAGE AND INTENSITY THIS AFTERNOON

INTO EVENING.  STEEP MIDLEVEL LAPSE RATES COUPLED WITH BOUNDARY

LAYER DEWPOINTS IN THE 50S WILL YIELD A MODERATELY UNSTABLE AIR MASS

WITH MLCAPE VALUES OF 1000-1500 J/KG.  WHEN COUPLED WITH PRONOUNCED

VEERING OF WINDS WITH HEIGHT...SETUP WILL FAVOR THE DEVELOPMENT OF

SUPERCELLS CAPABLE OF LARGE HAIL AND TORNADOES.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 21030.





...MEAD

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