Over the course of just a few hours Thursday afternoon and evening, a seemingly harmless band of clouds stretching across central Oklahoma exploded into violent, rotating thunderstorms that produced multiple tornadoes. In the later frames in the above animation, notice how clouds appear to bubble up. That’s evidence of overshooting tops - dome-like protrusions in the thunderstorm’s anvil, often indicative of severe storms. This animation also nicely illustrates the swirl and intensification of low pressure over western Kansas. Finally, if you look closely, you can see smoke extending from a fire in north central Texas, currently suffering from severe drought.

(Thanks to Ian Livingston, for creating the satellite loop shown)