Circumhorizontal Arcs

by Skip Via
skip@westvalleynaturalists.org

If you were gazing at the southeastern sky on the early afternoon of June 14, you may have noticed what appeared to be a rogue horizontal rainbow segment, or a sun halo that wasn’t circling the sun, or a Bob Ross-inspired happy little cloud with extra colors. (Alizarin crimson, yellow ochre, phthalo blue–you know the rest…)

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