The Wednesday high temperature record for Palm Springs - 119 degrees - is in jeopardy, as a relentless heat wave will hit the Inland Empire and Coachella Valley this week, forecasters said.
The National Weather Service said Waco reached 114 degrees around 5 p.m., beating the city's previous all-time record of 112 degrees set August 11, 1969.
High temperatures this month have played a role in the deaths of four people, according to county public health officials. The weather service said the warning for Utah's Dixie and Lake Powell regions will be in effect Tuesday through Thursday.
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Phoenix was also forecast to be among the hottest urban areas in the Southwest, with highs passing 100 (38 Celsius) by midmorning and hitting 113 (46 degrees) by early afternoon.
A high-pressure system moving over Southern California brought about thermometer readings in the mid-80s along the coast, and into the high 90s and the triple digits inland, according to the National Weather Service.
The weather agency uses a complicated formula that varies from region to region to declare an excessive heat warning, including close to record or record-breaking temperatures.
The NWS issued a High Surf Advisory beginning Monday at 8 a.m. and lasting through 9 p.m. Wednesday.
The Los Angeles County Department of Public Health also urged people to stay out of the sun.
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Recent samples collected from the West End and North Side have tested positive for the virus, according to the health department. Dunks can be picked up at the Health Department during normal business hours, Monday - Friday, from 8:30 a.m. - 4:30 p.m.
Children, the elderly and pets shouldn't be left in homes without air conditioning or in cars even with open windows because temperatures can quickly soar to life-threatening levels, he said.
The weather service said Phoenix set a record of 115 on Monday and that "more of the same is in store through at least Wednesday".
Some of the highest temperatures over the next few days were expected in Phoenix, and officials are cautioning people to stay hydrated and take advantage of cooler indoor buildings.
News 8's Kerri Lane gives the latest weather update on the high heat and high surf.
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