The NOAA's Space Weather Prediction Center warned of a severe geomagnetic storm Friday with wide-ranging impacts that could potentially disrupt communications, the electric power grid, navigation, radio and satellite operations. The agency issued a Severe (G4) Geomagnetic Storm Watch for Friday evening, adding that "additional solar eruptions could cause geomagnetic storm conditions to persist through the weekend." It's the most severe warning in 20 years. NOAA said it's monitoring the ...