000 WWUS20 KWNS 220500 SEL8 SPC WW 220459 KSZ000-NEZ000-220300- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH - NUMBER 688 NWS STORM PREDICTION CENTER NORMAN OK 1159 PM CDT THU SEP 21 2023 THE NWS STORM PREDICTION CENTER HAS CANCELLED TORNADO WATCH NUMBER 688 ISSUED AT 450 PM CDT FOR PORTIONS OF KANSAS NEBRASKA