A rainbow punctuates the colorful sky in the wake of a thunderstorm complex near Adrian, TX, on June 6, 2014.
An ominous shelf cloud races southward over the University of Oklahoma campus in Norman on the early morning of June 17, 2013.
A line of severe thunderstorms bears down on Shamrock, TX, on May 29, 2013.
Spectacular wave patterns along the edge of a thunderstorm anvil near Walters, OK, on March 30, 2013.
Perfect rainbow behind a line of thunderstorms on I-44 near Amber, OK, on October 13, 2012.
After an autumn severe weather day, ferocious winds kick up a minor dust storm at sunset near Billings, OK, on September 17, 2011.
A mammatus-filled sunset behind a departing thunderstorm near Lexington, OK, on May 12, 2011.
A line of severe thunderstorms bears down near Seibert, CO, on June 11, 2010.
A shelf cloud precedes a thunderstorm complex at sunset near Faulkton, SD, on May 22, 2010.
Several cloud-to-ground lightning bolts strike the High Plains near Turkey, TX, on April 21, 2010.
A supercell near Dalton, NE, casts a shadow over the barren landscape on June 5, 2009.
A frightening shelf cloud surges ahead of an outflow-dominant thunderstorm complex near Quail, TX, on May 12, 2009. This shelf cloud was advancing at over 60 mph for a time.