WATCHES: Severe Thunderstorm Watch Number 638

WWUS20 KWNS 222348
SEL8
SPC WW 222348
COZ000-KSZ000-230500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 638
NWS STORM PREDICTION CENTER NORMAN OK
550 PM MDT WED AUG 22 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

EASTERN COLORADO
WESTERN KANSAS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 550 PM UNTIL
1100 PM MDT.

HAIL TO 2 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES NORTH
NORTHWEST OF COLORADO SPRINGS COLORADO TO 40 MILES SOUTHEAST OF
GOODLAND KANSAS. 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 637...

DISCUSSION...THUNDERSTORMS WILL INCREASE IN COVERAGE/INTENSITY ALONG
E-W BOUNDARY NEAR I-70. CONVECTION MAY GROW INTO ONE OR MORE
CLUSTERS LATER THIS EVENING IN ADVANCE OF A MID LEVEL WAVE EJECTING
EWD/ENEWD FROM SW CO. INSTABILITY AND DEEP LAYER VERTICAL SHEAR
WILL BE SUFFICIENT FOR STORMS WITH SUPERCELL STRUCTURES WITH THE
INITIAL STORMS...WHICH WILL LOCALLY ENHANCE THE THREAT FOR LARGE
HAIL. DAMAGING WINDS WILL ALSO BE A THREAT...ESPECIALLY AS STORM
MERGERS PROMOTE COLD POOL DEVELOPMENT.

AVIATION...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 27020.

..THOMPSON

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