Wind damage (WD) ahead of a rapidly developing "blow echo" in northern Oklahoma that will move into southern Kansas. They sometimes produce brief tornadoes.
FF = flash flood threat. A flash flood warning was just issued for Harper Co., Kansas. The flash flood threat will continue during the evening.
Update at 6:59pm. Radar at 6:56pm shows gusts above 70 mph in the circled area. Be aware with the approaching line of storms!