WATCHES: Severe Thunderstorm Watch Number 590

WWUS20 KWNS 162135
SEL0
SPC WW 162135
OKZ000-TXZ000-170500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 590
NWS STORM PREDICTION CENTER NORMAN OK
435 PM CDT THU JUL 16 2009

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

WESTERN AND CENTRAL OKLAHOMA
EXTREME NORTHERN TEXAS

EFFECTIVE THIS THURSDAY AFTERNOON FROM 435 PM UNTIL MIDNIGHT 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 85
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTH
NORTHEAST OF DURANT OKLAHOMA TO 40 MILES WEST OF CLINTON
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...CONTINUE...WW 587...WW 588...WW 589...

DISCUSSION...THUNDERSTORMS CONTINUE TO DEVELOP AND INTENSIFY ALONG
SEVERAL REMNANT OUTFLOW BOUNDARIES OVER NRN AND SRN OKLAHOMA.
ENVIRONMENT IS VERY WARM ACROSS MUCH OF THE AREA WITH TEMPERATURES
OF 95-100F WHICH IS CONTRIBUTING MLCAPE OF 1500-2500 J/KG. NWLY
FLOW ALOFT IS FORECAST TO STRENGTHEN THIS EVENING WHICH WILL ENHANCE
DEEP LAYER SHEAR AND AID IN STORM ORGANIZATION AND CONTINUED
POTENTIAL FOR SEVERE STORMS.

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 27025.

...WEISS

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