Geomagnetic storms are classified using a G-scale, which ranks their intensity from G1 (minor) to G5 (extreme).

Space weather forecasters issued a rare, severe solar storm alert on Sunday after the sun let out a huge burst of energy called a coronal mass ejection last week.

The lights are expected to be most vivid in the northernmost states, such as Michigan and Washington State.

Prepare for a celestial spectacle as the mesmerizing Northern Lights, or Aurora Borealis, are illuminating skies across more than a dozen U.S. states. Recent solar activity has made this typically elusive phenomenon visible much farther south than usual,

Regions closest to the border with Canada will have the highest possibility of seeing the aurora.