A punishing heat wave will bring hot temperatures to eastern US and linger for several days, underscoring how climate change heats things up.

A Heat Advisory remains in effect with heat indices ranging from 100 to 110 degrees, and temperatures are expected to continue to rise until a cold front brings a cooldown on Wednesday night.

An intense heat wave threatens millions of people across the Southeast with temperatures reaching 115 degrees through midweek.

Much of the U.S. is under extreme heat warnings or advisories while New York, Philadelphia and Washington could feel like 100 degrees or more.

A phenomenon called "corn sweat" could exacerbate the impacts of the extreme heat blanketing a large portion of the U.S., according to experts.

Widespread showers and storms are likely to develop between 3 p.m. and 5 p.m., moving west to east. Tropical downpours with several inches of rain are possible under any thunderstorms, leading to localized flash flooding. There is also a lower-end severe weather threat with any storm, including damaging winds and large hail.

The Saharan dust continues to linger into Monday. This means the hot, humid and hazy trend will continue. Highs in the lower to middle 90s with heat indices near 105. The heat will be dangerous. Hazy sunshine expected along the coast. An isolated storm firing up along the sea breeze can't be ruled out for the later afternoon.