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What is a sun dog in weather terms?

Matt Elwell, 6News meteorologist, offers this explanation: A sun dog is caused when the sun’s rays reflect by ice crystals in the atmosphere. It is typical with high cirrus clouds, but blowing snow like we had recently will put ice crystals into the lower atmosphere and cause a “halo” or ring to form around the sun. It often causes bright spots of light on either side of the sun as it is low on the horizon.

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