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WWUS20 KWNS 162035

SEL2

SPC WW 162035

COZ000-NEZ000-WYZ000-170400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 622

NWS STORM PREDICTION CENTER NORMAN OK

235 PM MDT MON AUG 16 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN COLORADO

       NEBRASKA PANHANDLE

       SOUTHEAST WYOMING



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 235 PM UNTIL

1000 PM MDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES EAST

NORTHEAST OF DOUGLAS WYOMING TO 50 MILES SOUTH OF LIMON COLORADO.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 619...WW 620...WW 621...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY THIS AFTERNOON OFF THE HIGHER TERRAIN AS LARGE-SCALE

FORCING ASSOCIATED WITH UPSTREAM TROUGH ACTS ON A STEEP-LAPSE RATE

AND MODERATELY UNSTABLE AIR MASS.  AREA VWP/PROFILER DATA INDICATE

THE PRESENCE OF VERTICALLY-VEERING WIND PROFILES WITH 30-40 KT OF

DEEP WLY SHEAR.  AS SUCH...SETUP WILL FAVOR THE DEVELOPMENT OF

ORGANIZED STORMS INCLUDING SUPERCELLS WITH THE THREAT FOR MAINLY

HAIL AND LOCALLY DAMAGING WIND GUSTS.  STORMS MAY GROW UPSCALE INTO

AN MCS TONIGHT WITH A HAIL AND WIND THREAT DEVELOPING INTO THE NEB

PNHDL AND THE PLAINS OF ERN CO.



AVIATION...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 500. MEAN STORM

MOTION VECTOR 28025.





...MEAD

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