An ag meteorologist says cool air from Canada competing against a heat and humidity dome came to a head in Michigan last week.

Jeff Andresen is the state climatologist.

“The heat and humidity is what changes those thunderstorms from being a common garden variety to something which is much, much different, violent and severe, at least seven tornadoes recorded officially across the state,” he says.

Governor Gretchen Whitmer has declared a state of emergency for the five counties impacted by the destruction.

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