Record-Breaking Heat Wave Scorches the Midwest; NY Activates the National Guard 

Hunter Van Dyne pauses to wipe sweat from his forehead inside a hot fireworks tent as he works to set up for the opening of Powder Monkey Fireworks, in Weldon Spring, Mo., Monday. (AP Photo/Jeff Roberson)

(AP) — Extreme heat alerts affected tens of millions of people in the United States on Tuesday as cities including Chicago broke records at the start of a week of sweltering weather.

Midwestern states started to bake Monday in what the National Weather Service called a dangerous and long duration heat wave expected to stretch from Iowa to Maine until at least Friday.

New York Gov. Kathy Hochul said Tuesday that she has activated the National Guard to assist in any heat emergencies that develop over the next several days.

“This is a time of significant risk, and we’re doing our best to make sure that all lives are protected,” Hochul said during a morning briefing.

Chicago broke a 1957 temperature record Monday with a high of 97 degrees Fahrenheit. Hot and muggy conditions will continue this week with peak heat indexes near 100 F at times, the National Weather Service in Chicago said in a post on social media.

Last year, the U.S. saw the most heat waves — abnormally hot weather lasting more than two days — since 1936. Officials warned residents to take precautions.

Much of the Midwest and Northeast were under heat warnings or watches, with officials opening cooling centers and urging people to limit outdoor activities when possible and to check in with family members and neighbors who may be vulnerable to the heat.

The heat has been especially dangerous in recent years in Phoenix, where 645 people died from heat-related causes in 2023, which was a record. Temperatures there hit 112 F on Saturday. Weather service forecasters say the first two weeks of June in Phoenix were the hottest start to the month on record there.

A meteorologist with the National Weather Service in Phoenix, Ted Whittock, advised reducing time outdoors between 10 a.m. and 6 p.m., staying hydrated and wearing light, looser fitting clothing. More than 100 cooling centers were open in the city and surrounding county, including two new overnight ones.

In Southern California, firefighters increased their containment of a large wildfire burning in steep, hard-to-reach areas of mountains north of Los Angeles. But hot, dry, windy weather could challenge their efforts Tuesday. Wildfires also burned in New Mexico, prompting the evacuation of a village of 7,000 people.

While much of the U.S. swelters, late-season snow was forecast for the northern Rockies, with parts of Montana and north-central Idaho under a winter storm warning. As much as 20 inches was predicted for higher elevations around Glacier National Park.

Meanwhile, a fresh batch of tropical moisture was bringing an increasing threat of heavy rain and flash flooding to the central Gulf Coast.

Hurricane season this year is forecast to be among the most active in recent memory.

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