SEL5
SPC WW 041726
ARZ000-MOZ000-OKZ000-050100-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 545
NWS STORM PREDICTION CENTER NORMAN OK
1230 PM CDT SAT JUL 4 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN ARKANSAS
EXTREME SOUTHERN MISSOURI
EASTERN OKLAHOMA
EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 1230 PM UNTIL
800 PM 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 45
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES SOUTH
SOUTHWEST OF MUSKOGEE OKLAHOMA TO 25 MILES NORTH OF WALNUT RIDGE
ARKANSAS. 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.
DISCUSSION...THUNDERSTORMS SHOULD CONTINUE TO INTENSIFY ALONG EWD
TRACKING MCS OUTFLOW MOVING INTO HOT/UNSTABLE AIRMASS FROM ERN OK
ACROSS NRN AR THIS AFTERNOON. DESPITE LIMITED MID-LEVEL
FLOW...SUFFICIENT LIFT ALONG LEADING EDGE OF COLD POOL...AND
STEEPENING LOW-LEVEL LAPSE RATES SHOULD CONTRIBUTE TO DAMAGING WIND
POTENTIAL AS STORMS MOVE/DEVELOP EAST THROUGH THE AFTERNOON.
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 28015.
...CARBIN
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