High heat and humidity expand from the Northwest into the central U.S. and lower Mississippi Valley this week with temperatures in the high 90s to 100-degree range.
Thunderstorms with the risk of heavy rain continue over parts of the Southwest and California. Flood watches are posted.
![Heat advisories currently in effect.](https://a57.foxnews.com/static.foxnews.com/foxnews.com/content/uploads/2021/07/1200/675/heat-advisories.png?ve=1&tl=1)
Heat advisories currently in effect. (Fox News)
A front moving into the upper Midwest traveling across the Great Lakes will bring some strong to severe storms today and Tuesday.
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![The national forecast for Monday, July 26.](https://a57.foxnews.com/static.foxnews.com/foxnews.com/content/uploads/2021/07/1200/675/061f4f39-national-forecast.png?ve=1&tl=1)
The national forecast for Monday, July 26.
The main risks will be strong winds, hail and isolated tornadoes.
Upper-level winds will push some of the smoke from wildfires into the Northern Tier of the country in the next few days.