From Seattle to Maine, a huge swath of states across the Northeast and as far west as the state of Washington could have a chance to see the northern lights this Halloween weekend, according to the University of Alaska Fairbanks' Geophysical Institute. Depending on the weather and factors like light pollution, millions of Americans as far south as Pennsylvania could see the aurora borealis, or northern lights, as early as Saturday night. The Geophysical Institute shows northern parts of states including New York, Maine, North Dakota, Michigan and Wisconsin and all of New England could see a glimpse of the lights. If weather allows, "highly active auroral displays" will be seen from be visible overhead in Portland, Oregon and New York City, according to the Geophysical Institute. Be on the lookout in your city this Halloween weekend! #northernlights #halloweenweekend