Powerful geomagnetic storm reaches Earth with possible impact on GPS, power grids through Saturday evening

The powerful geomagnetic storm that will make the northern lights visible to much of the US has been upgraded to a Level 5, the National Oceanic and Atmospheric announced in an updated warning. “Extreme” G5 conditions reached Earth from the sun shortly before 7 p.m. Friday night — the first geomagnetic storm of such magnitude since Halloween 2003,...