Millions in the Upper Midwest face the possibility of a severe thunderstorm outbreak Monday that could bring rounds of dangerous storms capable of unleashing damaging winds, large hail and strong tornadoes — the start of several days of extreme weather threats across the country this week.

So how should you properly assess your trees after a storm rolls through? Tyler Hesseltine, a Board-Certified Master Arborist, works for Davey Tree Expert Company. He said there are three things to investigate after a storm: Inspect the tree's base.