WATCHES: Severe Thunderstorm Watch Number 546

WWUS20 KWNS 041751
SEL6
SPC WW 041751
OKZ000-050100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 546
NWS STORM PREDICTION CENTER NORMAN OK
1245 PM CDT SAT JUL 4 2009

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

SOUTHWEST AND SOUTH-CENTRAL OKLAHOMA

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 1245 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 40
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES EAST
NORTHEAST OF ARDMORE OKLAHOMA TO 45 MILES WEST NORTHWEST OF ALTUS
OKLAHOMA. 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.

OTHER WATCH INFORMATION...CONTINUE...WW 545...

DISCUSSION...VERY HOT AND UNSTABLE CONDITIONS /95-100F SFC TEMPS AND
DCAPE TO 1500 J PER KG/ HAVE DEVELOPED ALONG AND SOUTH OF
WELL-DEFINED MCS OUTFLOW SITUATED ACROSS SCNTRL OK ATTM. A FEW MORE
HOURS OF HEATING ACROSS THE REGION WILL ESSENTIALLY REMOVE REMAINING
CONVECTIVE INHIBITION AND LEAD TO AN INCREASING CHANCE FOR STORM
DEVELOPMENT NEAR THE RESIDUAL BOUNDARY. DESPITE REACTIVELY WEAK
MID-LEVEL FLOW AND EFFECTIVE SHEAR...BOUNDARY LAYER HEATING WILL
CONTRIBUTE TO A DEEP AND NEARLY DRY ADIABATIC SUB-CLOUD LAYER THAT
SHOULD SUPPORT STRONG TSTM DOWNDRAFTS CAPABLE OF PRODUCING WIND
DAMAGE. RANDOM STORM/OUTFLOW INTERACTIONS MAY FURTHER ENHANCE TSTM
ORGANIZATION AND PERSISTENCE INTO THE EVENING HOURS.

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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