Major U.S. metropolitan areas including those of Milwaukee, Minneapolis and Seattle are north of the projected viewline, while other cities including Buffalo and Detroit are just south of the predicted cutoff for seeing the lights. The northern lights may be visible in almost all of Canada, including Calgary, Montreal and Toronto.

The sun sends us gifts of a dazzling show of light come Christmas night. Skywatchers are anticipating a possible aurora borealis for parts of the US on Dec. 25 following a solar flare that spewed a coronal mass ejection (CME) toward Earth.