SEL8
SPC WW 172059
NEZ000-SDZ000-180400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 408
NWS STORM PREDICTION CENTER NORMAN OK
300 PM MDT SUN JUN 17 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN NEBRASKA
SOUTHWEST SOUTH DAKOTA
EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 300 PM UNTIL
1000 PM MDT.
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 55
STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES NORTH
NORTHWEST OF VALENTINE NEBRASKA TO 35 MILES EAST OF SIDNEY
NEBRASKA. 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.
OTHER WATCH INFORMATION...CONTINUE...WW 407...
DISCUSSION...DEEP MIXING DUE TO HOT SURFACE CONDITIONS IS SUPPORTING
MARGINAL TO MODERATE MLCAPE AND INCREASING THUNDERSTORMS OVER WRN
PORTIONS OF WW LATE THIS AFTERNOON. SHEAR WILL REMAIN ADEQUATE FOR
ORGANIZED STORMS...INCLUDING SUPERCELLS. LARGE HAIL AND DAMAGING
WINDS WILL BE PRIMARY SEVERE THREATS AS THIS ACTIVITY SHIFTS ENEWD
THROUGH THE EVENING.
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 25025.
..EVANS
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