High temperatures will continue Sunday, but a cold front will soon bring relief from the heat wave - CNN

A cold front moving through the Midwest will reach the East Coast by Monday, bringing heavy rain and cooler air, according to CNN Meteorologist Ivan Cabrera.

The front will quiet days of extreme temperatures, Cabrera said.

This week's high temperatures prompted cities across the US to open cooling centers, issue safety instructions to residents and cancel many outdoor events. New York's mayor declared an emergency. One death has been attributed to the high temperatures: Former NFL player Mitch Petrus, 32, died of a heat stroke after working outside Thursday during a heat advisory in Arkansas, officials said.

Part of the relief comes from the dropping of overnight temperatures in the Midwest, which had often hovered near 80 degrees in the past week.

While temperatures on the East Coast and Midwest may sink down to the 70s on Monday, Sunday still has some heat in store.

Sunday severe weather

Although down from Saturday's 157 million, there are still more than 95 million people under a heat warning or advisory for Sunday.

Heat index forecasts for Sunday, as of the early morning.

The heat index has much of the Midwest feeling as if it's in the 90s, while the East Coast faces triple digits -- with Washington, D.C., at the highest with 110.

And although the more central states are being cooled a bit by the moving front, at least 350,000 people are without power across Michigan due to severe weather, according to Poweroutage.US.

Staying safe in the final stretch

With one day of extraordinary heat left, officials are still asking people to take steps to stay safe.

Over the past week, the heat wave stretched from New Mexico to Maine, prompting authorities across the country to put out warnings and recommendations to help deal with the heat.

How to stay safe in this week's heat wave

While many people -- especially in regions that tend to see higher temperatures regularly -- underestimate the dangers of summer heat, it annually kills more Americans on average than any other natural disaster, Cabrera said.

Those most vulnerable include the elderly, infants, children, those in cities and people who live or work outside, according to a report by the International Federation of Red Cross and Red Crescent Societies.

To reduce those dangers, the report and city officials recommend staying hydrated, avoiding being outside during peak heat hours, training medical staff and community members on heat stroke symptoms and enlisting the help of friends, family and neighbors to check on people particularly at risk.

Climate change's impact

The threat of heat waves will become more serious across the globe and more widespread as the climate crisis continues, says Francesco Rocca, president of the International Federation of Red Cross and Red Crescent Societies.

Children cool down by playing in a public fountain during the summer heat on July 19 in New York City.

A new report by the Red Cross Red Crescent Climate Centre says 17 of the 18 warmest years on record have occurred since 2001.

"Climate projections indicate that if greenhouse gas emissions continue on their current pathway, by the year 2100 three out of four people on Earth could be subject to at least 20 days per year of potentially deadly heat and humidity levels," the report says.

And in the US, the number of days each year with a heat index of more than 100 degrees will more than double by mid-century, a report by the Union of Concerned Scientists says.

CNN's Dakin Andone, Jay Croft and Artemis Moshtaghian contributed to this report.

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