OKLAHOMA CITY (AP) – Forecasters say the heat wave gripping the

central U.S. is "unrelenting" and sweaty residents shouldn’t

expect any relief soon.

Heat advisories and warnings are in place in 17 states, from

Texas to Michigan, as temperatures and humidity combine to make

being outside uncomfortable for millions.

National Weather Service forecaster Daryl Williams in Norman,

Oklahoma, says much of the central U.S. is under a so-called "heat

dome".