How far north would you have to go to se Northern Lights on the American continent? Only Canada and Alaska or can you see them in any of the other states too?
I have seen them many, many times from ships on Lake Superior, Lake Michigan, and Lake Huron, most commonly in autumn and winter. Those sightings would have occurred in the territorial waters of Minnesota, Michigan, Wisconsin, and Ontario, CA. Have also seen them (when not aboard a ship) from Minnesota, the Upper and Lower Peninsulas of Michigan, and many different places in CA. Also twice from the Salt Lake City, UT area, which is not at all common but occurs on rare occasions and was alerted to the possibility by media ahead of time.
On a related note, I have also seen and heard the Norwegian Hurtigruten ship Nordlys blowing the vessel's horn in Trollfyorden in the Lofotens. This was done for the benefit of all the passengers aboard but we were camped along the water's edge and I would rate the echo all-world best!