When Worlds Collide
In addition to the fantastic landscape even meteorology adds zest to northwest America’s nature. During summer cold and dry air-masses from Canada often collide with warm and humid air from the Gulf of Mexico. This causes the development of intense thunderstorms along this air-mass boundary called squall line. Intense downdrafts cause the clouds to form mammatus structures. Shortly after this image the thunderstorm reached the photographers position in the wide open spaces.
Pentax MZ-5, Pentax 50mm, f/8, 1sec, Kodak Ektachrome E6, ISO 100, tripod