There are a number of aurora notification system, just search 'aurora' with 'alert' 'email' and/or 'notification'. Aurorachasers.com was good, but I haven't looked at it in years and something is wrong with the site at the moment I guess. 'The Aurora Alarm' will actually email your phone, but is targeted for western US, you'd only get notified late night if your eastern.

Anyway, as it happens, we just had one on New Year's Eve. This is the best time of year to see one, and the included links should let you determine your viewability based on location. The just sign up for one of the alerts, and wait patiently.

site gives a good guess on your viewing locations, in terms of magnetic latitude: http://www.swpc.noaa.gov/Aurora/index.html

The Aurora Alarm: http://www.keteu.org/~haunma/aurora/index.html

The last link (the actual link) is the same as the first one but sends you directly to the subscription page, so you can get emails, it's free it repeatedly refers to it's self as a 'product' and 'costumers' for some reason, but it just the national weather service using weird lingo. I just signed up for it myself so I can't testify how good it is, but swpc is the site the various aurora chasers get there data from in the first place, so it's definetly the horse's mouth.

Hope this helps you (and anyone else reading this), good luck.

PS. Similiar notification systems exist for meteor showers and comets. We're actually in one right now, it peaks on Feb 8, but it's not a big one, next really good one is in april, warmer too then.