The heat and humidity expected at Friday evening's concert in Memorial Park could cause health issues for some of those in attendance.

The heat index, which measures how hot it feels when the humidity is factored in with the actual temperature, is expected to be 102 at 6 p.m., when the event starts.

Concertgoers who sweat profusely could develop heat cramps, said Dr. Peter Daher, an emergency medicine physician with CHI Health. CHI Health will have a medical tent set up near the stage at the concert.

Affected people could experience muscle cramps in their abdomen, legs and arms, Daher said. People should drink sports drinks to replace the electrolytes they lose when perspiring, he said. They also should get to a cool place.

Those most at risk are infants, young children, the elderly, people who take certain medications and people drinking large amounts of alcohol.

People who feel dizzy or nauseated or like they're going to black out could be suffering from heat exhaustion, Daher said. If untreated, that can turn into heat stroke, a medical emergency that results in a very high body temperature, a bright red or flushed look, a racing heartbeat or even a coma.

People out in the heat should stay well hydrated and wear sunscreen, a hat and light, loose-fitting clothing, Daher said. They should seek shade whenever possible, he said.

Saturday afternoon, the heat index could hit 105, the National Weather Service said.

At those levels, people should keep an eye on pets, children and others who are vulnerable.

Corey Mead, a Valley-based meteorologist with the weather service, said the region is heating up because a dome of high pressure has settled overhead and southerly winds are drawing up moisture from the Gulf of Mexico.

Cooler weather arrives next week, and rain is possible over the Fourth of July holiday.

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Nancy Gaarder helps cover public safety and weather events as an editor on The World-Herald's breaking news desk. Follow her on Twitter @gaarder. Phone: 402-444-1102.

Bob Glissmann helps cover public safety and weather events as an editor on The World-Herald's breaking news desk. Follow him on Twitter @BobGlissmann. Phone: 402-444-1109.

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