WATCHES: Severe Thunderstorm Watch Number 534

WWUS20 KWNS 301854
SEL4
SPC WW 301854
ARZ000-OKZ000-010200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 534
NWS STORM PREDICTION CENTER NORMAN OK
155 PM CDT TUE JUN 30 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

CENTRAL AND WESTERN ARKANSAS
EASTERN AND CENTRAL OKLAHOMA

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 155 PM UNTIL
900 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 75
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST
SOUTHWEST OF CHANDLER OKLAHOMA TO 55 MILES EAST NORTHEAST OF PINE
BLUFF ARKANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 533...

DISCUSSION...SCATTERED THUNDERSTORMS HAVE BEGUN TO FORM OVER AR
ALONG WEAK REMNANT OUTFLOW BOUNDARIES. HOT AND HUMID CONDITIONS ARE
LEADING TO STEEP LOW LEVEL LAPSE RATES AND HIGH CAPE...SUGGESTING
THE POTENTIAL FOR LOCALLY DAMAGING WINDS IN STRONGER CELLS.
ISOLATED CELLS ARE ALSO EXPECTED TO DEVELOP WESTWARD ALONG THE WEAK
COLD FRONT INTO CENTRAL OK THIS AFTERNOON WHERE SIMILAR CONDITIONS
EXIST.

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 30020.

...HART

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