Oppressive heat wave to continue across West

From left, Subrina Madrid, Sarah Hudak, Jennifer, Shackelford, all of North Las Vegas, Nev., sit in the shallow waters along Boulder Beach at Lake Mead, Saturday, June 29, 2013 near Boulder City, Nev. The three planned to spend the day at the lake to escape the heat in Las Vegas where Saturday's daytime high was expected to reach 117 degrees, which is the city's all-time high. It was 108 at noon Saturday in Sin City. ()
AP Photo/Julie Jacobson

Updated 4:47 p.m. ET

LAS VEGAS High temperatures brought discomfort to much of the Southwest on Sunday as many parts of the region were coming off record-breaking heat days and bracing for more sizzling temperatures.

Triple-digit heat was on tap for the valleys and desert regions of Southern California, while metropolitan Phoenix was expected to see a slight drop in temperatures after experiencing record-breaking heat Saturday.

Six half-marathon runners in Southern California were hospitalized Sunday for heat-related illnesses. A day earlier, paramedics responding to a Nevada home without air conditioning found an elderly man dead.

Runners in the Southern California race who required medical attention were extremely dehydrated, and some experienced cramps, said Pasadena Fire Department spokeswoman Lisa Derderian. Several other runners were evaluated along the route but were not taken to the hospital, she said.

Paramedics were deployed along the 13.1-mile race, and buses with air conditioning were provided for runners to cool off. The event was supposed to be a marathon, but it was downgraded due to low turnout last year.

And CBS Radio Los Angeles affiliate KNX 1070 reports the excessive heat conditions are raising concerns about potential fire dangers in California.

"These high temperatures are drying out the fuels or out making them really ready to burn and the humidity will be quite low," National Weather Service (NWS) Meteorologist Andrew Rourke told KNX's Ed Mertz. "Only good thing about it is we don't have a lot of wind."

Phoenix Fire Department spokesman Larry Nunez said Phoenix hasn't seen any deaths that were classified as heat-related, but emergency workers have gotten 98 heat-related calls within the metro area since Friday morning.

The 119-degree high in Phoenix on Saturday marked the fourth-hottest day in metro Phoenix since authorities started keeping temperature records more than 110 years ago.

The high temperature forecast for the metro area for Sunday was 116.

Temperatures could drop slightly in Phoenix within the coming days as monsoon storms are expected to make their way through the state. Such storms could bring cloud cover but could produce more humidity and possibly contribute to dust storms.

Several Southern California communities set same-day record highs Saturday including Palm Springs, where the mercury peaked at 122 degrees.

Death Valley, the hottest place on the planet, reached 127 degrees Saturday. It was forecast to be 1 degree hotter Sunday. As sweltering as it will be, it's still shy of the all-time record high of 134 degrees, set nearly a century ago on July 10, 1913.

Temperatures were also in the triple digits in Las Vegas, reaching at least 110 degrees Sunday. On Saturday, 200 people were treated for heat problems as temperatures soared up to 114 degrees in Las Vegas.

Clark County spokesman Erik Pappa says about 30 of them were hospitalized for heat-related injuries Friday afternoon at Van's Warped Tour at Silverton Casino.

He says most of the others "were essentially provided shade and water and a place to sit down."