SEL1
SPC WW 080250
COZ000-KSZ000-NEZ000-081000-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 891
NWS STORM PREDICTION CENTER NORMAN OK
850 PM MDT SUN SEP 7 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHEAST COLORADO
NORTHWEST KANSAS
SOUTHWEST NEBRASKA
EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 850 PM UNTIL
400 AM MDT.
HAIL TO 1.5 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 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 65 MILES WEST OF
AKRON COLORADO TO 40 MILES EAST OF HILL CITY KANSAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU1).
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 EXPECTED TO INCREASE IN COVERAGE AND STRENGTH
THROUGH EARLY MONDAY IN ZONE OF INCREASING WAA/DPVA DOWNSTREAM FROM
AMPLIFYING NRN STREAM SHORTWAVE TROUGH. STEEP MID LVL LAPSE
RATES...COOL MEAN TEMP PROFILES...INCREASING PWS WITH EWD
EXTENT...AND MODERATE WNWLY CLOUD LAYER FLOW SUGGEST GOOD RISK FOR
SVR HAIL AND POSSIBLY LCLY DMGG WIND WITH THE SLIGHTLY ELEVATED
STORMS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 29030.
...CORFIDI
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