WATCH LIVE: Smoke chokes skies for over 120 million Americans as Canadian wildfire pours across US
Skies smothered in thick, acrid wildfire smoke that will eventually cover more than 122 million people across 15 states.
Strong-to-severe thunderstorms are in the forecast for sections of the Plains over the mid-Mississippi and Ohio Valley on Thursday, with the risk of large hail, damaging winds, heavy rain and isolated tornadoes.
TEXAS' RECORD-BREAKING HEAT AMONG HOTTEST IN THE WORLD, BLAMED FOR MORE THAN A DOZEN DEATHS

The threat of severe storms Thursday in the Plains, mid-Mississippi Valley and the Ohio Valley. (Credit: Fox News)
These storms will help move the smoke from the Canadian wildfires toward the Eastern Seaboard, where air quality alerts are in place for another day.

Air quality alerts through Thursday in the eastern U.S. (Credit: Fox News)
Extreme heat hangs around the South with excessive heat warnings and advisories stretching from California, along the Gulf Coast and toward the Southeast.

Heat alerts through Friday evening in the southern U.S. (Credit: Fox News)
CLICK HERE TO GET THE FOX NEWS APP
The combination of record-setting temperatures and humidity makes it dangerous to be outside for long periods of time.