Heat advisories affect 168 million Americans in the mid-west, south-east and parts of the north-east US.

Heat advisories are in place in 29 states, posing serious risks to humans and critical infrastructure as utilities prepare for increased demand.

Heat and humidity are stretching east from the Mississippi River valley, with heat indices topping 110F in some areas

Heat advisories affect 168 million Americans in the mid-west, south-east and parts of the north-east US.