We'll cool off as we head into the overnight hours.
Boston again opened up city pools free to residents as the temperature cracked 90 degrees for the third consecutive day by noon.
Moisture intensifies the effect of high temperatures and Friday temperatures were predicted to reach 100 degrees F (37 C) in Washington, 97 degrees F (36 C) in Philadelphia and 91 degrees F (33 C) in NY will feel more like 110 degrees F (43 C), Roth said. The inside temperature of the vehicle can quickly reach 120 degrees. Police in one suburb also posted a tongue-in-cheek request on their Facebook page.
In Florida, high summer heat indexes are nothing out of the ordinary, but this year has already been exceptionally hot.
And in the USA, the number of days each year with a heat index of more than 100 degrees will more than double by mid-century, a report by the Union of Concerned Scientists says.
The city also directed office buildings to set thermostats no lower than 26 degrees Celsius through today to reduce strain on its electrical grid.
With one day of extraordinary heat left, officials are still asking people to take steps to stay safe.
Elsewhere in Pennsylvania, nine firefighters were treated for heat exhaustion and six transported to a hospital for treatment while fighting a house fire in sweltering conditions.
After a lull in storms after the initial wave, we're tracking a second wave moving in along the actual front as we head late into Sunday night and early into Monday morning.
In New Jersey, the Oceanic Bridge over the Navesink River was closed Saturday evening after it got stuck open.
The front is expected to return Greater Boston to more seasonable temperatures, with the mercury finally dipping below 70 degrees by about 4 a.m. Tuesday, forecasters said. The high heat index values are caused by high temperatures in lower to mid 90s and dewpoints in the lower to mid 70s. Postpone outdoor games and activities. The eldery, young children and people with medical conditions are especially at risk during the unsafe heat wave.
"Ceiling fans are economical and cost far less to use than air conditioners but use them only in occupied rooms because they work on the wind-chill effect to cool people".
"Possible record high minimum temperatures are forecast from parts of the Middle Mississippi Valley into the Great Lakes/Ohio Valley and from parts of New England southward to the Carolinas into the Tennessee Valley on Saturday into Monday", the NWS added.
Storms have knocked out power to hundreds of thousands of people in parts of MI and Wisconsin, heightening the misery.