Nature Walk: Evening Thunderhead

Cumulonimbus clouds commonly form as the result of cold and warm air masses colliding. They begin pristine white and at sunset gradually shift to yellow and finally red. This occurs as sunlight passes through low levels of the atmosphere where dust and moisture in the air scatter short wavelengths of blue and green and leave longer wavelengths of red and yellow. It is the perfect time to be a cloud watcher.

When is your favorite time to sit an watch the clouds change? Have you noticed any striking sunsets or colorful cumulonimbus clouds this fall?

If you are interested in purchasing a print of this photo or requesting information on possible use of any of our “Nature Walk” photographs, please contact Carl Kurtz at cpkurtz@netins.net.

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