Damaging winds, large hail and a few tornadoes will also be possible with these storms.Elsewhere, wildfire smoke from Canada continues to blanket the Midwest, prompting alerts for millions for dangerous breathing conditions.

Smoke from wildfires blazing across Canada is once again wafting over huge portions of the Midwest and worsening air quality, with conditions particularly bad on August 1 in Minnesota, Iowa and Illinois.

"Breathing in the Canadian wildfires smoke cannot be the new normal," said Candice Miller, Macomb County public works commissioner.