

861 

WWUS20 KWNS 102241

SEL8

SPC WW 102241

COZ000-NEZ000-WYZ000-110600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 698

NWS STORM PREDICTION CENTER NORMAN OK

445 PM MDT MON AUG 10 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN COLORADO

       SOUTHERN NEBRASKA PANHANDLE

       EXTREME SOUTHEAST WYOMING



EFFECTIVE THIS MONDAY AFTERNOON FROM 445 PM UNTIL MIDNIGHT MDT.



HAIL TO 2.5 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 85

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES WEST

NORTHWEST OF SIDNEY NEBRASKA TO 35 MILES EAST OF COLORADO SPRINGS

COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 695...WW 696...WW 697...



DISCUSSION...SUBTLE SHORTWAVE TROUGH MOVING ACROSS THE CENTRAL HIGH

PLAINS LATE TODAY WILL LIKELY MAINTAIN STRONG TO SEVERE

THUNDERSTORMS EWD ACROSS THE HIGH PLAINS THROUGH THE EVENING.  VERY

STEEP LAPSE RATES AND 40-50 KT EFFECTIVE SHEAR WILL SUPPORT

SUPERCELLS WITH THREAT OF LARGE HAIL AND ISOLATED DAMAGING WINDS.



AVIATION...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 28025.





...EVANS

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