There are some amazing northern lights going on across America, and the rest of the world, tonight

My nephew saw them in Arizona.  People saw them across America - in Maryland, Tennessee, NY, Ohio, Missouri and more.  These shots from Potomac, Maryland, right outside of DC, are amazing.  I'm, sadly, in San Francisco attending a Netroots Nation board meeting, and it's cloudy here.  The lights hit about an hour ago, but the conditions are right for it to possibly happen again tonight, they say, so keep your eyes on the northern skies.