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Heat wave making its way to Southern California

File: Children try to cool down and take advantage of the Grand Park fountain in downtown Los Angeles on Wednesday, July 5, 2017.
File: Children try to cool down and take advantage of the Grand Park fountain in downtown Los Angeles on Wednesday, July 5, 2017.
Richard Vogel/AP

As Texas braces for a hurricane, Southern California is expecting a heat wave. Elevated temperatures start Friday. They'll peak on Monday and could last through most of next week.

On Sunday, downtown Los Angeles will be in the 90s. Santa Clarita and the Valleys will reach triple digit temperatures. Some cities in the Inland Empire will be as hot as 108 degrees. Even coastal areas will warm significantly.

"The ridge of high pressure loft, what that does is it provides sinking air, which heats the atmosphere and that's combining with the weaker onshore flow, so we see less of that marine cooling influence," said Robbie Munro of the National Weather Service to KPCC. 

An excessive heat watch will be in effect for most of Southern California from Sunday through Tuesday. 

The NWS advises people to limit the amount of time they spend outdoors, especially in the middle of the day, drink plenty of water and find air conditioning if you can.