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One thought on “John Knowles”

  1. Anne Downie avatar Anne Downie says:

    Well done! Nice capture

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Nacreous clouds are often lenticular wave clouds which are found downwind of mountain ranges that induce gravity waves in the stratosphere. These nacreous clouds were spotted by Gary's friend, Sierra Salin, in the early morning hours over Mt. Tamalpais, Marin County, California, US.

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