NWS Explains Halo Formed Around Moon

NATIONAL WEATHER SERVICE MOUNT HOLLY: Time once again for a little science on the night shift! If you were out late this evening, you may have noticed the full moon had an especially interesting appearance with a halo (and a few people even caught a glimpse of a double halo). Halos (either around the moon or the sun) are formed due to the refraction of light through ice crystals in high clouds.

In the case of tonight, a low pressure system centered well to our southeast, is responsible for the abundance of high clouds over our region (satellite loop in the comments).

Our colleagues from the La Crosse, WI office have more information on halos and other optical phenomena at this page: https://www.weather.gov/arx/why_halos_sundogs_pillars


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