You’ve been warned: Stay inside

Summer is waging war with a vengeance, and it’s taking no prisoners.

A heat wave began cresting Friday when temperatures climbed to 115 and tied the record for June 28 set in 1994, according to the National Weather Service. It is expected to intensify over the weekend and has health and safety agencies issuing heat warnings and safety tips.

An example of how bad it can get: 206 people attending the Vans Warped Tour at the Silverton were treated for heat-related conditions by the Clark County Fire Department between 3 to 8 p.m. Friday. Of those 34 people needed more than shade, water and a place to sit and had to be taken to local hospitals.

Las Vegas Fire Department spokesman Tim Szymanski said that 35 heat-related calls were received by 911 as of 8 p.m. Friday, not including calls from the concert. Seven people were taken to the hospital, most with heat exhaustion that did not appear to be life-threatening.

As temperatures soar to 117 degrees at the official airport weather site and higher in other parts of the valley today through Monday, everyone is sending out the same message.

People are encouraged to stay cool and be safe by drinking plenty of water, staying out of the sun, wearing loose-fitting clothing, checking on neighbors and having a phone in case of emergency. Also encouraged is to have extra water with you and in your car, wear sunscreen, always watch children near swimming pools and never leave children or pets in cars.

In other developments:

■ Las Vegas and Clark County officials have opened cooling stations around town for people to get out of the sun and get hydrated.

■ Lake Mead National Recreation Center has advised people to avoid strenuous activities, and Red Rock Search and Rescue has placed people on standby in case there are injuries in Red Rock Canyon.

■ Wet ‘n’ Wild Las Vegas is extending weekend hours so people can enjoy the facilities without battling the heat. There will be a movie night on alternating Fridays.

■ The Regional Transportation Center is telling people to take water with them to bus stops and to check the status of buses at rtcsnv.com because they could break down in extreme heat.

■ Nevada Department of Public Safety said an average 675 deaths occur in the United States annually from extreme heat events. The elderly, children, those who work outdoors, the homeless and pets are in the greatest danger.

■ Clark County has issued an air quality warning for smoke from wildfires in Arizona, Colorado and New Mexico. There is also a warning for ground-level ozone.

■ The Bureau of Land Management has a fire restriction in place, including the prohibition of campfires and fireworks.

■ The Running with the Devil marathon race scheduled for Saturday at Lovell Canyon Road has been canceled because after event organizers decided the race was too dangerous.

Heat-related injuries can include heat stress, heat exhaustion and heat stroke. Symptoms include signs of nausea, dizziness, hot and dry skin, profuse sweating, chills, throbbing headaches or extreme weakness.

People experiencing those symptoms are urged to stay out of the sun, drink water and if the symptoms persist or worsen, call 911.

University Medical Center officials said they haven’t seen any increase in heat-related injuries yet, but they are not ruling it out for this weekend.

Everyone is getting ready for what might be a historic heat wave in Las Vegas.

The longest stretch of 115 degrees or higher temperatures in Las Vegas was in July 2005, when there was a four-day heat wave, National Weather Service meteorologist Chris Stachelaski said.

The hottest it has been in Las Vegas on record from the official site is 117 degrees. This weekend might beat that.

Esther Arnell and her two boys, ages 12 and 13, typically beat the heat at local splash pads, but this weekend they won’t be out in any of the city parks.

“It’s just too damn hot,” she said.

Review-Journal writer Tom Ragan contributed to this report. Contact reporter Rochel Leah Goldblatt at rgoldblatt@reviewjournal.com or 702-383-0264.