WATCHES: Severe Thunderstorm Watch Number 160

WWUS20 KWNS 130342
SEL0
SPC WW 130342
OKZ000-TXZ000-131000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 160
NWS STORM PREDICTION CENTER NORMAN OK
1040 PM CDT WED MAY 12 2010

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

SOUTHWEST OKLAHOMA
WEST AND NORTHWEST TEXAS

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1040 PM
UNTIL 500 AM CDT.

HAIL TO 2.5 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 80
STATUTE MILES NORTH AND SOUTH OF A LINE FROM MIDLAND TEXAS TO 55
MILES SOUTH SOUTHEAST OF ALTUS OKLAHOMA. 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...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 156. WATCH NUMBER 156 WILL NOT
BE IN EFFECT AFTER 1040 PM CDT. CONTINUE...WW 157...WW 158...WW
159...

DISCUSSION...STORM DEVELOPMENT ALONG RETREATING DRYLINE IS FORECAST
TO GRADUALLY EVOLVE INTO FORWARD PROPAGATING MCS THROUGH LATE
TONIGHT/EARLY THURSDAY. THIS PROCESS WILL BE AIDED AS DEEP-LAYER WSW
FLOW INCREASES ACROSS THE AREA AND LOW LEVEL JET MAINTAINS MASS AND
MOISTURE INFLOW INTO THE DEVELOPING CONVECTION. INITIAL THREAT WILL
BE FOR HAIL AND HEAVY RAIN WITH THE POTENTIAL FOR DAMAGING WINDS TO
EVOLVE AS COLD POOLS CONGEAL AND MAINTAIN STORM-SCALE/MESOSCALE
ASCENT EWD INTO VERY MOIST UNSTABLE REGIME ACROSS NW TX AND SW OK.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 24035.

...CARBIN

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