Tampa, Fla., recorded 100 degrees for the first time this weekend as extreme heat settles across much of the region.

More than 250 million people in the U.S.—nearly three quarters of the population—are experiencing moderate, major or extreme risk of heat effects on July 28, according to the National Oceanic and Atmospheric Administration’s National Weather Service.

Tampa temperatures hit triple digits Sunday for the first time in recorded history, the National Weather Service said. Why it matters: Extreme heat will continue into Tuesday, with a heat advisory in effect from noon until 7pm for much of the Tampa Bay area.

Tampa temperatures climbed into triple digits for the first time in recorded weather history on Sunday. Air temperatures read 100 degrees at Tampa International Airport, the National Weather Service’s Tampa Bay office wrote in a post Sunday about 3:30 p.

Extreme heat and humidity are expected to hammer the New York City area to start the week. We could see our second heat wave of the season, with three consecutive days above 90 degrees.CBS News New York's First Alert Weather team has issued a string of First Alert Weather Days due to the threat of intense heat.

A heat advisory has been issued for Monday, Tuesday and Wednesday for heat indices forecasted to reach 100 degrees for the first half of the week.