Wyoming hail chase vehicle, circa 1970 (D102079)

Mammatus clouds (DI02038) Photo by Ben Foster

Mammatus clouds (DI02037) Photo by Ben Foster

Mammatus clouds (DI02036) Photo by Ben Foster

Thunderstorm Project technicians, 1947 (DI01982)

Black Widow night fighter, the Thunderstorm Project (DI01981)

The Thunderstorm Project, 1947 (DI01980)

Solar convection patterns (DI01904) Illustration by Mark Miesch

Frequency of Atlantic storms (DI01899) Illustration by Steve Deyo

NCAR's S-Pol radar (DI01892)

Lodgepole pines under a heavy snow (DI01859)

Supercell thunderstorm (DI01801)