It is the strongest solar storm to blast Earth since Sunday . Two blasts of magnetic plasma left the sun on the fall of 2013 . Combined and arrived on Earth about 15 hours earlier and stronger . 'Very strong possibility ' that the northern lights could be seen as far south as the middle United States , even Tennessee and Oklahoma .
It is the strongest solar storm to blast Earth since the fall of 2013 . Two blasts of magnetic plasma left the sun on Sunday . Combined and arrived on Earth about 15 hours earlier and stronger . 'Very strong possibility ' that the northern lights could be seen as far south as the middle United States , even Tennessee and Oklahoma .