For those of you elsewhere, there is a paid phone alert, which I don't really know much about beyond its existence.
For everyone in Northern latitudes, the earth is going to move through a stream ejected through a hole in the sun's corona on the 20th and 21st, which is likely to produce a good aurora.
Seattlites: We're going to try to be on the other side of the mountains for it. Wanna join us? :)