The aurora borealis could be visible as far south as Chicago, Belfast, and Seattle tonight and tomorrow:
A significant event located on the Sun facing Earth took place on July 12. The effects of this event will begin to reach Earth early on the 14th of July GMT.
Observers in North America should watch for aurora on the nights of the 14th and 15th local time. Depending on the configuration of the disturbance, auroras may be visible as far south as the middle tier of states.
Activity may remain high also on the 16th. Auroras should be visible Southern New Zealand, Tasmania, and of course, Antarctica.
I've only seen aurorae from airplanes in flight over the polar regions. Obviously they're invisible from within the city of Chicago, but if I had a boat, tonight would be great for going out on the lake and looking for them.