Sizzling US temperatures put more than 100 million people under heat alerts

Key Points:

• Over 100 million people across the U.S. are under heat alerts as dangerously high temperatures, including triple-digit highs, are expected from the West to the Midwest, with cities like Las Vegas, Phoenix, and Rapid City forecast to reach 105 degrees or higher.
• Extreme heat warnings are active in multiple major cities, with heat indices reaching 105 to 115 degrees due to high humidity, and overnight temperatures providing little relief, staying near 80 to 90 degrees in many areas.
• Record-breaking temperatures are anticipated in Denver and Rapid City, while the Southwest, including Palm Springs, California, is expected to experience unusually high temperatures up to 115 degrees this week.
• Severe thunderstorms are forecast for the Upper Midwest and Great Lakes regions, with a moderate risk of damaging winds, large hail, and isolated tornadoes, particularly affecting cities like Minneapolis, Duluth, Green Bay, and Milwaukee.
• The severe weather threat will shift eastward on Monday toward the Great Lakes and Ohio Valley, continuing the risk of damaging winds, large hail, and isolated tornadoes, while a cold front may bring some relief to the Upper Midwest early in the week.