Dangerous heat, humidity will linger for most of late July

Dangerous heat and humidity is building for much of the eastern half of the U.S. and will linger at least through the end of July.

The National Weather Service warns that a stretch of unusually hot and humid weather will begin across the southeast this weekend, then expand into the midsouth on Monday and Tuesday, eventually across much of the midwest on Wednesday and Thursday.

The risk is high (greater than 60 percent) for the long-duration heat wave. Multiple days of dangerous heat and humidity, with no effective cooling relief overnight, will be a health concern for many.