A relentless heat wave continued to bake most of the country Friday, with numerous areas expected to see record- breaking temperatures and forecasters warning there would likely be little relief through the first weekend of the summer for most areas.

More than 100 million Americans were under heat advisories.

The steamiest conditions Friday were in parts of Ohio and Indiana, where heat indexes soared past 100 degrees and remained there most of the day.

But the Midwest was not the only area being baked: Heat and excessive heat warnings and advisories had been issued across the Northeast, the Mid-Atlantic and in some Western states.

Idaho officials said two people in their 60s have died of heat-related causes — the state’s first heat- related deaths of the year. Health officials did not release additional information about the victims Friday, including where they died.

Millions of residents across the country have had their lives disrupted by days of unusually high temperatures.

In Michigan, utility crews from several states were working feverishly Friday to restore power to thousands of suburban Detroit customers, two days after severe storms knocked out their power, leaving residents suffering amid a heat wave expected to linger through Saturday.

About 12,000 homes and businesses remained without power Friday afternoon in Oakland County, a suburban area north of Detroit hit hard by Wednesday night’s storms that cut power to about 75,000 homes and businesses at its peak, said Brian Calka, DTE Energy’s vice president of distribution operations.

Between 500 and 600 crew members from utilities in Ohio, Indiana and Illinois were working with about 1,000 DTE Energy utility workers and 1,000 tree- trimming contractors to get the power back on amid the heat.

Calka said the utility’s goal was to get the power back on for all its customers by late Friday or early Saturday.

This month’s sizzling daytime temperatures were 35 times more likely and 2.5 degrees higher because of the warming from the burning of coal, oil and natural gas — in other words, human-caused climate change. That is according to World Weather Attribution, a collection of scientists that run rapid climate attribution studies that have not been peer reviewed.

Last year, the U.S. experienced the most heat waves since 1936, experts said.

An Associated Press analysis of Centers for Disease Control and Prevention data found that the excessive heat contributed to more than 2,300 U.S. deaths, the highest number in 45 years of records.

Over the next couple of days, some locations could see the highest temperatures they have experienced in years.

In Washington and other cities along the Interstate 95 corridor, temperatures may exceed 100 degrees. If Washington hits 100, it will be the first time the nation’s capital has been that hot since Aug. 15, 2016.

The New York Times contributed.