SEL3
SPC WW 221957
COZ000-KSZ000-NEZ000-230300-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 613
NWS STORM PREDICTION CENTER NORMAN OK
255 PM CDT WED JUL 22 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHEAST COLORADO
NORTHWEST KANSAS
SOUTHWEST AND SOUTH-CENTRAL NEBRASKA
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 255 PM UNTIL
1000 PM CDT.
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 70
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTHWEST
OF AKRON COLORADO TO 45 MILES SOUTH SOUTHEAST OF KEARNEY
NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
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...TSTMS ARE DEVELOPING ALONG W-E ORIENTED BOUNDARY IN
CONJUNCTION WITH PASSAGE OF SHORT WAVE TROUGH THROUGH WRN/CNTRL NEB
INTO KS. PRESENCE OF STEEP LOW TO MIDLEVEL LAPSE RATES...MLCAPE OF
1000-2000 J/KG AND 35-45 KT OF DEEP NWLY SHEAR WILL LIKELY PROMOTE
ORGANIZED STORM CLUSTERS /INCLUDING SUPERCELLS/ WITH THE THREAT FOR
LARGE HAIL AND DAMAGING WIND GUSTS.
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 500. MEAN STORM
MOTION VECTOR 35030.
...MEAD/HALES
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