SEL3
SPC WW 311935
ARZ000-OKZ000-010200-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 923
NWS STORM PREDICTION CENTER NORMAN OK
235 PM CDT FRI OCT 31 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
PARTS OF WESTERN ARKANSAS
PARTS OF EASTERN OKLAHOMA
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 235 PM UNTIL 900
PM 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF
POTEAU OKLAHOMA TO 40 MILES EAST SOUTHEAST OF RUSSELLVILLE
ARKANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
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...HEATING HAD REMOVED MUCH OF CINH WRN AR/ERN OK WITH
MLCAPES TO 1000 J/KG THIS AREA. WITH SMALL UPPER LOW DROPPING SSEWD
FROM SWRN MO...LARGE SCALE ASCENT AND FAVORABLE SHEAR PROFILES
SUPPORTS DEVELOPMENT OF SURFACE BASED THUNDERSTORMS ACROSS THE
WATCH. WITH STEEP MID LEVEL LAPSE RATES AND COLD AIR ALOFT...LARGE
HAIL WILL BE PRIMARY THREAT WITH THE STRONGEST STORMS.
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 450. MEAN STORM
MOTION VECTOR 27025.
...HALES
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