“It’s starting to spit out some pretty good lightning ... up to the storm, we pass through Liberal, Kansas, and then head straight north toward Sublette. A dark mass of clouds is building ...

He said shelf clouds were triggered when the cool air mixed with the warm, moist atmosphere near the ground and pushed upward. "The bigger the storm, the more potential mixing there is ...

that brings cool air crashing back down to the ground." The shelf clouds were accompanied by blasts of lightning and ...