Storms on Tuesday brought a rare forecast for damaging winds, large hail, and even tornadoes to parts of the northeastern United States and Canada, areas not typically accustomed to such severe weather.

Dave Sills, director of the Northern Tornadoes Project, warned of the potential for tornadoes not seen in decades in Quebec. The "main event" was expected to be powerful supercell thunderstorms capable of generating violent tornadoes, an "extreme storm environment" uncommon in Canada. The threat extended from southeastern Quebec into central Maine, with the U.S. Storm Prediction Center also expressing concern.

While tornadoes are rare in this region—Vermont averages fewer than one per year, Maine about two, and Quebec and New York about 10 each—July is their typical season. This severe weather is driven by a large heat dome over the U.S. creating atmospheric instability. A potential wild card is wildfire smoke, which could stabilize the atmosphere and dampen storm development, though its exact impact remained uncertain.