Space weather experts warn that a moderate-strength geomagnetic storm could hit Earth Friday or Saturday (Aug. 8 or 9) — possibly bringing auroras to northern U.S. skies. On Wednesday (Aug. 6), the National Oceanic and Atmospheric Administration (NOAA) issued a geomagnetic storm watch and suggested that the storm is likely associated with a recent solar flare that erupted from an active region of the sun.

Northern Lights above the Alaskan mountains, Atigun Pass. If you’re in a few lucky states tonight, look up at the sky for a colorful show. The aurora borealis, a natural phenomenon that fills like the sky with undulating colorful lights,