A high pressure system over the southwest U.S. will remain in place Saturday, keeping most of the region under a blazing sun.

The system will begin weakening Sunday, when temperatures are expected to start returning to seasonable norms, the National Weather Service said.

Meteorologists said the extreme heat will significantly increase the potential for heat-related illnesses, particularly for those working or participating in outdoor activities.

People should be prepared to drink plenty of fluids, stay in an air conditioned room, stay out of the sun and check up on relatives and neighbors.

While young children and pets should never be left unattended in vehicles under any circumstances, the weather service said that is especially true during warm or hot weather — when car interiors can reach lethal temperatures in a matter of minutes.

Meanwhile, cooling centers have opened in multiple locations in Riverside County, giving residents who don’t have access to air conditioning a cool place to stay during the peak heat portion of the day. A complete list of centers is available at www.capriverside.org/cool-centers.

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