TOMS RIVER, N.J. – Another wave of oppressive heat clamped down on a broad swath of Eastern states on Saturday, with temperatures in the high 90s and 100s and residents scrambling for shade or just staying indoors.

In the mid-Atlantic, already the locus for brutal temperatures several times in July, weather experts warned of the dangerous conditions and residents resigned themselves to coping with the discomfort.

“Oh, it’s disgusting. It’s already really hot,” meteorologist Heather Sheffield of the National Weather Service said of morning temperatures in Washington, D.C.

One possible weather-related death was reported in Maryland, where paramedics said the high temperatures and humidity likely played a role in the death of a 20-year-old bicyclist who went into cardiac arrest and hit his head on a tree as he fell.

With the heat and humidity combining for a possible heat index of over 110 degrees, the weather service issued an excessive heat warning for the first time this year for an area stretching from south of Washington to north of Baltimore, along the Interstate 95 corridor. midday Saturday, a wide band from lower New England to the Deep South was under a heat advisory.

The thermometer hit 100 degrees in Washington and Baltimore by mid-afternoon, where the heat index was 109. In Norfolk, Va., it was 104 degrees and 108 degrees with the heat index. Elsewhere, record highs for July 24 of 97 degrees in New York and Philadelphia and 99 degrees in Newark, N.J., were reported.

As temperatures soared toward 100 degrees in New Jersey, Harry Oliver, 47, of Lakehurst was trying to make sense of it all as he waited to get sandwiches inside a Toms River convenience store.

“When I complain about the heat and humidity, my wife reminds me that I was begging for this type of weather when I was shoveling all that snow this past winter,” he said. “Now I’m looking forward to the snow again.”

Oliver said he and his wife didn’t want to cook. “It’s hot enough in the house already, even with my air conditioning running 24/7,” he said.

In New York City, the heat brought out the inner entrepreneur in one resident.

A.J. Ousmane, 27, a native of the West African nation of Mali, sold bottles of ice-cold water for $1 from a cooler on a Harlem sidewalk. He planned to stay out all afternoon, and hoped to make about $55 for the day, after expenses.

“I keep moving with the shade,” he said, as he positioned himself in the creeping shadow of a coin-operated laundry.

Poolside, Meredith Watkins, 20, slathered herself with SPF 15 and filled her water bottle before working a shift as a lifeguard in suburban Columbus, Ohio. Watkins scouted the swimming pool for an excuse to jump in — something she says she does at least once an hour on hot days.

“You still gotta do your job when it’s this hot,” she said, twirling a whistle on a red lanyard. “Especially with the humidity, it makes it awful. You just sit there and sweat and sweat.”

Kristin Kline, a weather service meteorologist at Mount Holly, N.J., said this summer hasn’t been “record-setting hot” in most places.

The off-and-on scorching heat in the mid-Atlantic can be blamed on “a Bermuda high” that is pushing hot, humid air into the region, Kline said.