@Ondřej-Šutera thanks for letting me know. Too bad it is gone. The ring was very accurate. We have many thunderstorms where I live and seeing the rings expand and then hearing the thunder exactly when the ring reached my location was very special. For those that live in areas that do not have lightning, this feature probably can not be truly appreciated.
In fact, at the high school where I worked, I would show students this feature during a storm to show them the speed of sound. They were amazed that the sound of thunder matched the arrival of the expanding ring.
Thanks to everyone for making Windy the best weather resource without any advertisements. Just the weather.