SEL8
SPC WW 220048
COZ000-KSZ000-NEZ000-220600-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 668
NWS STORM PREDICTION CENTER NORMAN OK
750 PM CDT THU JUL 21 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
FAR EASTERN COLORADO
NORTHWEST KANSAS
SOUTHERN NEBRASKA
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 750 PM
UNTIL 100 AM CDT.
HAIL TO 1 INCH 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 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST
SOUTHWEST OF BURLINGTON COLORADO TO 60 MILES NORTHEAST OF RUSSELL
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.
DISCUSSION...MCS NOW FORMING IN E CNTRL CO EXPECTED TO MOVE MAINLY
NEWD ALONG AND N OF STALLED WSW-ENE FRONT OVER NW KS. NOCTURNAL
STRENGTHENING OF LLJ...STEEP LOW LVL LAPSE RATES...INCREASING
MOISTURE WITH NWD EXTENT...AND MODEST WSW MID LVL FLOW SUGGEST
POTENTIAL FOR LOCALLY DMGG WIND GUSTS AND POSSIBLY MARGINALLY SVR
HAIL.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION
VECTOR 24020.
...CORFIDI
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