SEL0
SPC WW 042136
NEZ000-SDZ000-WYZ000-050500-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 660
NWS STORM PREDICTION CENTER NORMAN OK
340 PM MDT TUE AUG 4 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
MUCH OF NEBRASKA PANHANDLE
PARTS OF WESTERN SOUTH DAKOTA
LARGE PART OF EASTERN WYOMING
EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 340 PM UNTIL
1100 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 100
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST
SOUTHWEST OF GILLETTE WYOMING TO 50 MILES NORTHEAST OF ALLIANCE
NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).
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 657...WW 658...WW 659...
DISCUSSION...THUNDERSTORMS INCREASING IN NUMBER AND INTENSITY OVER
HIGHER TERRAIN ERN WY. WITH 35-40 KT OF SHEAR...VERY STEEP LAPSE
RATES AND MLCAPES AOA 1000 J/KG...WIND DAMAGE AND HAIL WILL BECOME
INCREASING THREAT AS STORMS MOVE EWD INTO ADJACENT HIGH PLAINS THRU
THIS 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 28035.
...HALES
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