NOAA projected Saturday night’s northern lights would have a Kp index of 3, a measure of the aurora’s strength on a scale of ...

Thursday may be the last day people in the northern U.S. could see the phenomenon this week, forecasters said.

ToplineThe aurora borealis may be visible again to several states along the Canadian border on Thursday, and it may be the ...

More Akbas/Anadolu via Getty Images) Tuesday night’s northern lights forecast is expected to have a Kp index of 3—an indicator ... within the lights’ “view line,” the southernmost ...