A heat warning remains in effect for Toronto today but some relief is expected to arrive this weekend. Environment Canada is calling for a high of 30 C today, feeling closer to 39 with the humidity. Saturday will see a high of 29 C, feeling like 37 when factoring in the humidity.

Extreme heat returns to the tri-state area with a vengeance Friday, pumping feels-like temperatures near 110 degrees in parts of New Jersey as the New York City metro area braces for afternoon humidity-fueled storms.

From Texas to New England, millions of Americans are facing dangerously hot temperatures that have led the National Weather Service to issue heat advisories and extreme heat warnings this week.

On Thursday, we warm to 90 again, and on Friday we'll be pushing 100, certainly reaching (and exceeding) when accounting for the humidity and the feels-like temps. Dewpoint temps will be going back into the mid-70s, so get ready to sweat when heading outside.

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.

Chicagoans are stepping up to help one another during another heat wave in the city. The temperature reached 94 degrees Wednesday, with a heat index of 105, according to the National Weather Service. An extreme heat warning is in effect through much of Thursday, when temperatures are forecast at a high of 94 and a heat index of 103.

The First Alert Weather Team is tracking a few inland moving downpours Thursday evening and looking ahead to near-record heat.

The heat dome won't dissipate soon. Dangerous heat is expected across parts of the Central and Southeast. through July, the weather service says. High temperatures will reach 100 degrees from Texas to western Tennessee almost every day for a week or two, AccuWeather said.