A severe geomagnetic storm could disrupt communications and bring northern lights to parts of California, according to a warning from the National Oceanic and Atmospheric Administration.

A severe solar storm could disrupt communications and cause colorful auroras, reaching some southern parts of the U.S. as early as Thursday, the National Oceanic and Atmospheric Administration

Space weather forecasters say a severe solar storm heading to Earth could stress power grids even more as the U.S. deals with major back-to-back hurricanes.