000 WWUS20 KWNS 220500 SEL7 SPC WW 220459 KSZ000-NEZ000-220300- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH - NUMBER 687 NWS STORM PREDICTION CENTER NORMAN OK 1159 PM CDT THU SEP 21 2023 THE NWS STORM PREDICTION CENTER HAS CANCELLED TORNADO WATCH NUMBER 687 ISSUED AT 250 PM CDT FOR PORTIONS OF KANSAS NEBRASKA