WATCHES: Severe Thunderstorm Watch Number 698

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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