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Helena Econn, 7, jumps off the diving board as she plays in a backyard pool during a 2010 L.A. heat wave.
A heat wave will bring triple-digit heat to some valley areas on Monday, the start of a week likely to see a heightened danger of fire in the Southland, along with a risk of thunderstorms, forecasters said.
The high temperatures forecast for this week — with triple-digit heat expected in both valley and mountain areas — will result from a strong upper- level high-pressure system centered over the great basin, according to an NWS advisory. Some monsoonal pressure is expected, which will result in a slight chance of afternoon and evening thunderstorms in the Antelope Valley and the mountains of Ventura and Los Angeles counties between Tuesday and Friday, according to the advisory. The peak of the heat wave will be between today and Wednesday, it said.
Anyone planning to spend time outdoors early this week should stay hydrated and avoid strenuous activity, according to the weather service.