SEL6
SPC WW 222257
NEZ000-SDZ000-230500-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 906
NWS STORM PREDICTION CENTER NORMAN OK
600 PM CDT MON SEP 22 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
MUCH OF WESTERN NEBRASKA
MUCH OF CENTRAL AND PARTS OF WESTERN SOUTH DAKOTA
EFFECTIVE THIS MONDAY NIGHT FROM 600 PM UNTIL MIDNIGHT 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 65
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES EAST OF
SIDNEY NEBRASKA TO 30 MILES NORTH OF MOBRIDGE SOUTH DAKOTA. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU6).
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...THUNDERSTORMS WILL INCREASE RAPIDLY IN NUMBER AND
INTENSITY ALONG AND AHEAD OF VIGOROUS COLD FRONT NOW MOVING EWD INTO
WRN NE/SWRN SD. WITH MLCAPES TO 1500 J/KG AND 40-50 KT OF SHEAR IN
ADVANCE OF S/WV TROUGH MOVING THRU WY...SUPERCELLS ARE POSSIBLE.
PRIMARY THREAT WILL BE LARGE HAIL AND DAMAGING WINDS. STORMS WILL
EVOLVE INTO A LINE LATER THIS EVENING AS THEY MOVE FURTHER E ACROSS
THE WATCH.
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 24035.
...HALES
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