A severe geomagnetic storm could cause colorful auroras over Northern California and Alabama.

NOAA: Solar storm set to arrive, possibly creating auroras as well as affecting communications, GPS systems and power | CNN
Favicon 
www.cnn.com

NOAA: Solar storm set to arrive, possibly creating auroras as well as affecting communications, GPS systems and power | CNN

A severe geomagnetic storm is expected to reach Earth on Thursday, which could bring an increased chance of auroras and may affect communications and the power grid.