Heat scorches parts of U.S., millions facing ‘extremely dangerous’ conditions

People in the U.S. Midwest and Great Lakes states are sweltering under intense heat and humidity in the lead-up to the Fourth of July holiday. In New York City, Mayor Zohran Mamdani warned that temperatures are expected to climb into the high 90s and triple digits, with a heat index that could peak at around 112 F (44 C).