Orange County sees triple-digit temperatures, extreme heat warnings on Labor Day

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Three-digit heat continues to weigh down Southern California on Monday, hitting a sixth straight Flex Warning in fact, urging residents to conserve electricity during peak times.

Orange County also has extreme heat warnings until 8 p.m. Friday for coastal and inland areas and the Santa Ana Mountains and foothills. Orange County beaches were in the upper 80s on Sunday, Anaheim reached 105, Santa Ana expected 103 degrees and Fullerton 107.

Nighttime lows don’t offer much relief either, as they stay in the 70s and even into the low 80s in some of the warmer areas.

“A prolonged period of very hot conditions with minimal cloud cover on the coast is expected as high air pressure remains anchored over the west,” the National Weather Service said. “Three-digit heat will be common for many valley and mountain locations through early next week. Record-breaking heat will put a very high risk of heat illness.”

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“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check on relatives and neighbors,” the NWS urged. “Young children and pets should not be left unattended in vehicles under any circumstances.”

Forecasters also urged residents to be aware of the signs of heat stroke and to take precautions.

“Take extra precautions if you work or spend time outside,” NWS forecasters said. “If possible, move strenuous activities to the early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke.

“If possible, wear lightweight, loose-fitting clothing. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling regular rest breaks in shady or air-conditioned environments. Anyone subject to heat should move to a cool and shaded area. location to be moved.”

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And the extreme heat warning has been extended until at least 8 p.m. Friday for coastal and inland areas of Orange County, including valleys in San Bernardino and Riverside, and the mountains and foothills of Santa Ana.

The California Independent System Operator — which manages the state’s electrical grid — issued the statewide Flex Alert from 4 p.m. to 10 p.m. Residents are urged to take the following energy-saving steps:

— set thermostats to 78 degrees or higher;

— avoiding the use of large appliances;

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— turning off unnecessary lights; and

— avoid charging electric vehicles.

Residents are also advised to pre-cool their homes as much as possible and close blinds and curtains to keep the interior cool.

The warnings have worked so far, with the state avoiding involuntary power cuts. Officials said Sunday, Monday and Tuesday in particular will be the most difficult days of the heat wave. Tuesday’s peak demand is expected to be 50,087 megawatts, just below the record 50,270 set in 2006.

According to Cal-ISO, electricity demand on Sunday was estimated at about 45,000.