WATCHES: Tornado Watch Number 672

WWUS20 KWNS 191940
SEL2
SPC WW 191940
COZ000-KSZ000-200200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 672
NWS STORM PREDICTION CENTER NORMAN OK
240 PM CDT WED SEP 19 2007

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

EXTREME EASTERN COLORADO
WESTERN KANSAS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 240 PM UNTIL
900 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTHWEST OF
BURLINGTON COLORADO TO 55 MILES SOUTH SOUTHEAST OF HILL CITY
KANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

DISCUSSION...SCATTERED THUNDERSTORMS ARE DEVELOPING IN THE WARM
SECTOR /S OF A WARM FRONT S OF I-70/ AS SURFACE TEMPERATURES WARM
INTO THE 80S AND REMOVE CONVECTIVE INHIBITION. EXPECT THE THREAT
FOR ADDITIONAL STORM DEVELOPMENT TO SPREAD NWD ACROSS ERN CO/WRN KS
AS THE WARM FRONT LIFTS NWD THROUGH THE AFTERNOON. MODERATE
INSTABILITY ALONG AND S OF THE BOUNDARY...AND EFFECTIVE BULK SHEAR
OF 35-50 KT...WILL SUPPORT SUPERCELLS CAPABLE OF PRODUCING LARGE
HAIL. A COUPLE OF TORNADOES WILL ALSO BE POSSIBLE THIS AFTERNOON
ALONG THE FRONTAL ZONE...WHERE LOW-LEVEL SHEAR AND MOISTURE WILL BE
MAXIMIZED.

AVIATION...TORNADOES AND 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 25020.

..THOMPSON

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