SEL5
SPC WW 300227
SDZ000-300800-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 695
NWS STORM PREDICTION CENTER NORMAN OK
930 PM CDT SAT SEP 29 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHEAST SOUTH DAKOTA
EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 930 PM
UNTIL 300 AM CDT.
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 55
STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES EAST
NORTHEAST OF HURON SOUTH DAKOTA TO 55 MILES SOUTH OF CHAMBERLAIN
SOUTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).
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 694...
DISCUSSION...SEVERE STORMS ALONG THE NEB/SD BORDER WILL DEVELOP NEWD
WITH A 50 KT LLJ ALONG THE LOW-LEVEL MOIST AXIS FROM NEB INTO ERN
SD. INSTABILITY AND VERTICAL SHEAR WILL REMAIN SUFFICIENT FOR
ORGANIZED SEVERE STORMS /INCLUDING BOWS AND SUPERCELLS/ CAPABLE OF
PRODUCING DAMAGING WINDS AND LARGE HAIL.
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 500. MEAN STORM
MOTION VECTOR 23040.
..THOMPSON
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