An excessive heat warning will be in place in the Los Angeles County mountains, excluding the Santa Monica range, until 9 p.m. Saturday evening. and until 9 p.m. Sunday in the Antelope Valley with temperatures reaching as high as 111 degrees.

A less-severe heat advisory was in effect for the Santa Clarita Valley until 9 p.m. Saturday.

Forecasters urged residents to take precautions to avoid being overcome by the heat, particularly in areas under excessive heat warnings.

“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors,” the weather service also said children and pets should never be left unattended in vehicles under any circumstances.

“Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible.”

Also due to the heat wave, the South Coast Air Quality Management District issued an ozone advisory through Saturday, predicting increased likelihood of poor air quality in many areas. Levels of ground-level ozone — the predominant summertime pollutant — are likely to reach unhealthy or higher air quality index levels throughout most of the Southland.

The Los Angeles County health officer issued a heat alert warning of high temperatures in the eastern San Gabriel Valley through Friday, the Santa Clarita Valley through Saturday and the Antelope Valley through Sunday.

The alert reminds everyone in the affected regions to take precautions to avoid heat-related illness, especially older adults, young children, outdoor workers, athletes, and people with chronic medical conditions.

Public Health officials issued the following recommendations to stay safe during high temperature days:

— Drink plenty of water throughout the day;

— Plan your day to avoid going out during the hottest hours, and wear sunscreen;

— Wear lightweight, light-colored clothes, and wear a hat or use an umbrella;

— Never leave children or pets in cars and call 911 if you see a child or pet in a car alone;

— Beware of heat-related illness, like heat stroke and call 911 if you or someone you know is experiencing high body temperature, vomiting, and pale and clammy skin;

— Check on those at risk, such as those who are sick, older adults, pregnant women, and children, and those who live alone; and

— If you are wearing a mask, avoid strenuous workouts wearing face coverings or masks not intended for athletic purposes.

“While it is very important that everyone take special care of themselves, it is equally important that we reach out and check on others, in particular those who are especially vulnerable to the harmful effects of high temperatures, including children, the elderly, and their pets,” said Los Angeles County Health Officer Muntu Davis.

“High temperatures are not just an inconvenience, they can be dangerous and even deadly.”

County and city partners operate cooling centers during times of high heat. Residents who do not have access to air conditioning are encouraged to take advantage of free cooling centers. Locations can be found at ready.lacounty.gov/heat/ or by calling 211.

Los Angeles County residents and business owners, including people with disabilities and others with access and functional needs can also call 211 for emergency preparedness information and other referral services.

Temperatures will cool next week with an expanding marine layer and gusty onshore winds, then will warm into next weekend.

The combination of gusty onshore winds and the persistent hot and dry conditions will maintain elevated to brief critical fire weather conditions through Monday.

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