

600 

WWUS20 KWNS 132140

SEL0

SPC WW 132140

COZ000-KSZ000-NEZ000-140400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 640

NWS STORM PREDICTION CENTER NORMAN OK

345 PM MDT WED JUL 13 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN COLORADO

       NORTHWEST KANSAS

       SOUTHWEST NEBRASKA



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 345 PM UNTIL

1000 PM MDT.



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 45 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTHWEST OF LIMON

COLORADO TO 40 MILES SOUTH SOUTHEAST OF KEARNEY NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 638...WW 639...



DISCUSSION...ISOLATED SUPERCELL THUNDERSTORMS HAVE BEGUN TO FORM

ALONG A BOUNDARY EXTENDING FROM EAST-CENTRAL CO INTO SOUTH-CENTRAL

NEB.  BACKED LOW LEVEL WINDS ALONG AND NORTH OF THE

BOUNDARY...COUPLED WITH NEAR 70F DEWPOINTS AND HIGH CAPE VALUES WILL

POSE A RISK OF A FEW TORNADOES THROUGH THE EVENING.

OTHERWISE...LARGE HAIL AND DAMAGING WINDS APPEAR TO BE THE MAIN

THREATS.



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 26025.





...HART

