A weather phenomenon over the Dallas-Fort Worth area Thursday afternoon had North Texans grabbing their cameras and snapping photos.
Some NBCDFW users who sent in photos referred to the oddity as a "sun dog" but meteorologist David Finfrock says not so fast -- it's really a circumhorizon arc.
You can find a very detailed explanation of a circumhorizon arc and photos from Atmospheric Optics as well as the National Weather Service. Or, click "watch video" on the left to hear an explanation from Finfrock.
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The simple explanation is that it's a halo or optical phenomenon caused by the refraction of sunlight through thick, flat, horizontal ice crystals in cirrus clouds. The result is just like when sunlight hits a prism separating the light into a myriad of colors.