A multiday heat wave is bringing high temperatures and health risks from the Midwest to the Northeast, prompting warnings and emergency measures.

Record-smashing daytime temperatures near 100 degrees are expected for millions from the Plains to the East Coast this week, while nighttime temperatures may stay above 80 in some metropolitan areas.

Cities across the eastern and central United States are bracing for more days of extreme temperatures as a unusual June heat wave continues to grip that portion of the country.