WATCHES: Severe Thunderstorm Watch Number 920

WWUS20 KWNS 212225
SEL0
SPC WW 212225
COZ000-KSZ000-NEZ000-220600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 920
NWS STORM PREDICTION CENTER NORMAN OK
425 PM MDT TUE OCT 21 2008

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

EASTERN COLORADO
WESTERN KANSAS
SOUTHWEST NEBRASKA

EFFECTIVE THIS TUESDAY AFTERNOON FROM 425 PM UNTIL MIDNIGHT 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 60
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES WEST
NORTHWEST OF MCCOOK NEBRASKA TO 60 MILES SOUTH SOUTHEAST OF LAMAR
COLORADO. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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.

DISCUSSION...POWERFUL COLD FRONT WILL SURGE SOUTHEASTWARD THIS
EVENING ACROSS EASTERN CO AND WESTERN KS. DESPITE ONLY MARGINAL
INSTABILITY...STRONG FORCING ALONG FRONT WILL LIKELY RESULT IN
SCATTERED THUNDERSTORMS. STEEP LAPSE RATES AND INCREASING LOW/MID
LEVEL WIND FIELDS INDICATE A RISK OF HAIL AND DAMAGING WINDS IN
STRONGER CELLS THROUGH THE EVENING.

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 400. MEAN STORM
MOTION VECTOR 27030.

...HART

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