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.

The smoke is expected to remain over the northern and central Plains of the United States for the next couple of days, according to meteorologists.