Heat wave scorches U.S. with 42 million under alerts as temperatures hit 119°F

Key Points:

• More than 42 million people across the southern United States are under heat alerts as temperatures soar above 100°F, with a peak of 119°F recorded near Tecopa, California.
• The "heat dome" causing extreme heat in the central and eastern U.S. has moved west, bringing dangerous heat warnings to parts of the Southwest, including Arizona, California, Nevada, and Utah, lasting through the weekend and into Monday in some areas.
• Heat index values could reach up to 120°F in southern Arizona and South Texas, with overnight temperatures remaining uncomfortably high, increasing the risk of heat-related illnesses for millions.
• The National Weather Service advises staying hydrated, using air conditioning, avoiding strenuous outdoor activities during peak heat, and monitoring vulnerable individuals for symptoms of heat exhaustion or heat stroke.
• A strong cold front is forecast to bring significant relief with cooler temperatures and lower humidity to much of the eastern U.S. by next weekend, reducing heat risks.