Thanks to WTVY News4 photojournalist Brandon Bryant for some great snapshots of the double-rainbow over Dothan late Wednesday afternoon. Look carefully… it’s off to the right.
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Friday, June 4th, 2010 5:18 pm at 5:18 pm
Marion Dees
Please explain an upside down rainbow that appeared Monday.
Friday, June 18th, 2010 10:40 am at 10:40 am
4warnwxteam
Marion…
From what I understand, rather than being caused by raindrops, “upside down rainbows” are caused my atmosphereric contions being “just right”.
While normal rainbows are formed when light penetrates raindrops and emerges on the other side, “upside down rainbows” are formed when sunlight shines through millions of tiny ice crystals in cirrus and cirrus stratus clouds. Because the crystals are flat and hexagonal, they invert the light and create an upside-down curve called a “circumzenithal arc”.
The phenomenon relies on the sun being low in the sky, normally less than 32 degrees from the horizon. The unusual arcs can appear at any time of the year, hovering in the sky for only a short time because of cloud movement.
Find more here:
http://cloudappreciationsociety.org/cirrostratus-december-%e2%80%9905/