It is possible to see aurorae from strong geomagnetic storms anywhere in the
United States. It is quite possible that what you observed was an aurora. Look
again tonight. A very strong geomagnetic storm began several hours ago, with
solar wind from the X-class event yesterday. This promises to be good viewing
time for aurorae.
By the way, aurora are often confused with "earthquake lights". Some of the
"best" observations of earthquake lights occurred during strong geomagnetic
storms and were probably aurorae.

• Space weather - including geomagnetic activity