The northern lights — also called aurora borealis — could be visible in Alaska, Washington, Montana, North Dakota, Minnesota, Michigan, Maine, northern parts of Idaho, Wyoming, Iowa, New York, Vermont and New Hampshire.

The aurora's are back! And may be visible throughout the weekend. The University of Alaska and NOAA track auroras using the Kp-index , a global auroral activity indicator which has a scale from 0 to 9. It measures the fluctuations in the Earth's magnetic field, tied to specific geographic locations.

The northern lights were visible as far south as New Mexico on Saturday night, The Washington Post reported, and others saw light displays in Wyoming and Utah. Some viewers in Tulsa, Oklahoma, were able to see the aurora as well, according to local outlet KOCO5.