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Thursday, June 14, 2012

Circumhorizontal Arc

Circumhorizontal arcs (pictured here) occur only between 55 degrees South and 55 degrees North, usually near the time of the respective summer solstice. They are formed by plate-shaped ice crystals in high level cirrus clouds. Other accepted names for circumhorizontal arcs are circumhorizon arc and lower symmetric 46° plate arc. Due to their large angular size they are rarely seen complete and most often appear as part of a cloud, as seen here on May 23, 2012 at 39°36'5"N, 74°20'17"W.

May 23, 2012    39°36'5"N, 74°20'17"W     (Click for full-size image)

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