

000 

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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