storm watch

A winter storm watch has been issued for the Northern Sierra and other Northern California mountains above 3,500 feet, where four to 15 inches of snow is possible Tuesday and Wednesday.

The National Oceanic and Atmospheric Administration has issued a severe geomagnetic storm watch that could disrupt communications, the power grid, navigation, radio and satellite operations but also generate a nighttime light show.

An unprecedented tropical storm watch has been issued for Southern California as Hilary barrels north toward the United States.

The solar discharges that caused the nighttime displays were so intense, they led the National Oceanic and Atmospheric Administration to issue its first severe geomagnetic storm watch since 2005.

The Space Weather Prediction Center issued a geomagnetic storm watch, saying the aurora will likely be visible over a large part of the U.S. this weekend.