Color of Sky

What causes a cloudless blue sky or a dark foreboding one?

Most days the sky is a shade of blue. A deep blue indicates a clean sky, and it can occur when a cold front moves unpolluted air in from the north or when clean air from the ocean is pushed over the land. Medium and light blue skies can indicate the presence of ample water vapor, sulfur from coal-burning power plants or emissions from trees and plants.

A pale or creamy white sky suggests air pollution from power and chemical plant emissions and other sources. Smoke from forest fires can turn the sky shades of gray; sometimes brown. The sky goes gray to almost black before a storm.

Some of the most spectacular sky colors of all pink, orange, yellow and violet, for instance happen when the setting sun reflects off the laden clouds of a departing storm.

Add to lightboxDownload comp

Add to lightboxDownload comp

Add to lightboxDownload comp

Add to lightboxDownload comp


Add to lightboxDownload comp

Add to lightboxDownload comp

Add to lightboxDownload comp

Add to lightboxDownload comp


Add to lightboxDownload comp