Over the weekend, the SWPC issued a G3 warning, which meant the aurora had the potential to be seen as far south as South Dakota, Iowa, northern Illinois, New York, and Washington state. Around 6:15pm Sunday night, the SWPC extended the warning through Monday morning, but the zone where the aurora might be seen will not be quite so far south Sunday night.
The green line on the below map from a previous G1 event shows the range where you should be on the lookout for the northern lights if you're fortunate enough to have clear skies.
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The area includes parts of Montana, North Dakota, Minnesota, Wisconsin, Michigan, and Maine. (And, of course, Alaska, but an appearance from the aurora borealis isn't that uncommon in Alaska.) In Canada, you'll be inside that zone if you're in British Columbia, Alberta, Saskatchewan, Manitoba, and northern provinces, as well as most of Ontario and Quebec.
A G1 event is not major, but it can get the aurora going enough to make it visible further south than you'll generally find it. The video above was taken during a G1 event earlier in 2018 over the Mackinac Bridge in Michigan. (The aurora was visible there Saturday night as well.)
How to see the northern lights
The SWPC's 3-Day Aurora Forecast shows the best opportunity to catch the show will be August 27 between 1am and 4am EST.
To see the northern lights, you'll want to get far from the light pollution of urban centers. National parks and state parks are generally a good place to start looking. Speaking on how to catch the northern lights, an SWPC representative previously told Thrillist, "You need very clear skies, a good view of the northern horizon (no tree, buildings, or hills), and it needs to be dark."