

615 

WWUS20 KWNS 300618

SEL5

SPC WW 300618

OKZ000-TXZ000-301400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 215

NWS STORM PREDICTION CENTER NORMAN OK

115 AM CDT THU APR 30 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN OKLAHOMA

       NORTH TEXAS



EFFECTIVE THIS THURSDAY MORNING FROM 115 AM UNTIL 900 AM 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 80 MILES WEST OF

WICHITA FALLS TEXAS TO 40 MILES SOUTH OF PARIS TEXAS.  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.



OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 214. WATCH NUMBER 214 WILL NOT

BE IN EFFECT AFTER 115 AM CDT.



DISCUSSION...N TX/S OK FORWARD-PROPAGATING MCS WITH EMBEDDED LEWPS

EXPECTED TO CONTINUE GENERALLY ESE...WITH ADDITIONAL DEVELOPMENT

POSSIBLY CONTINUING IN ITS WAKE OVER NW TX...ATOP ASSOCIATED COLD

POOL/WAKE LOW.  ACTIVITY LIKELY IS BEING FED BY RICH MOISTURE ALONG

MODERATE SSWLY LLJ.  STORM MERGERS AND PERIODIC DEVELOPMENT OF LEWPS

MAY CONTINUE TO POSE A THREAT FOR SPORADIC WET MICROBURSTS/SVR HAIL

AND POSSIBLY AN ISOLD TORNADO THROUGH LATER THIS MORNING.



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 28025.





...CORFIDI

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