The beginning of the severe event is now popping up right now just to our SW moving NE. This is also classic severe storm behavior. We will likely see very heavy rain starting in about an hour and contuining well into the late evening. Right now it is getting very dark. Looks like, for the KC area, NWS looks to be right on the money. Rats!!
If you are interested, go to the Wunderground link I posted and key in Kansas City MO and you can see how quickly these things can build.
Blessings