####018000399#### WWUS20 KWNS 200413 SEL6 SPC WW 200413 OKZ000-TXZ000-200400- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH - NUMBER 686 NWS STORM PREDICTION CENTER NORMAN OK 1113 PM CDT TUE SEP 19 2023 THE NWS STORM PREDICTION CENTER HAS CANCELLED SEVERE THUNDERSTORM WATCH NUMBER 686 ISSUED AT 445 PM CDT FOR PORTIONS OF OKLAHOMA TEXAS