With Southern California entering a 10th straight day of a prolonged heat wave, a tropical storm is bringing heavy rains and strong winds today and could create dangerous conditions in recent burn areas.
Southern California experienced a ninth straight day of record-setting heat Thursday, and the state's power regulators avoided rolling blackouts by asking all residents to conserve electricity during the hours of 3 to 10 p.m., extending the previous Flex Alerts by two hours.
High winds and possible flash flooding are in the forecast going into the weekend as a weakening hurricane approaches the California coast, according to the National Weather Service.
The agency posted a flash flood watch and high wind warnings for San Diego County mountains and deserts, beginning Friday afternoon and continuing to Saturday evening.The California Independent System Operator extended a Flex Alert for the eighth consecutive day Wednesday, urging residents to take the following power-saving steps:
— setting thermostats to 78 degrees or higher;
— avoiding use of major appliances;
— turning off unnecessary lights; and
— avoid charging electric vehicles.
Residents were also advised to pre-cool their homes as much as possible and close blinds and drapes to keep interiors cool.
The voluntary conservation measures have worked so far, as the power stayed on Tuesday despite a record demand for electricity. Just before 6 p.m., the state moved into an Energy Emergency Alert 3, calling for maximum conservation efforts while warning that blackouts could be imminent absent reduced demand.
To drive home the demand, alerts were sent to cell phones across the state urging people to "conserve energy now to protect public health and safety,'' and warning that “power interruptions may occur unless you take action.''
"As the state faces the hottest day in this prolonged, record- breaking heat wave, grid conditions are expected to worsen,'' according to the power-grid manager. “If needed, ISO could order utilities to begin rotating power outages to maintain stability of the electric grid. If that occurs, consumers should expect communications — either phone, text or email — from their utilities notifying them of outage areas and likely durations.''
Officials ended Energy Emergency Alert 3 at 8 p.m., declaring "consumer conservation played a big part in protecting electric grid
reliability.''
If energy reserves were exhausted, the ISO would have instructed utilities to manage rolling blackouts. Utilities make the determination of how best to spread and rotate the outages across their service territory, with the goal of keeping them as short as possible.
By late Tuesday afternoon, electricity demand reached 52,061 megawatts, breaking the record of 50,270 MW set in 2006, according to the ISO. Consumer and commercial demand response, including Flex Alerts, has been helping to extend tight resources over the past week, with a load reduction of around 1,000 MW for each of the past several days.
Southern California has seen temperatures soar above 100 degrees every day since Aug. 31, with little relief in sight until this weekend.
In San Diego, a minimum temperature of 75 on Thursday night tied a record set in 1984. A minimum temperature of 72 in Oceanside Harbor tied a record set in 2014. A minimum temperature of 70 in Vista tied a record set in 2014. A minimum temperature of 72 in Chula Vista broke a record of 71 set in 2020.
The National Weather Service extended an excessive heat warning until 8 p.m. Friday.
"Strong high pressure to the north will continue the heat wave through Thursday for inland areas, with the heat continuing through Friday for the coast and valleys,'' according to the NWS. “For next weekend, a weakening tropical system will bring increasing moisture, breezy conditions, and a chance of more widespread showers and isolated thunderstorms. Showers and higher humidity will linger through early next week.''
Health officials advise residents to stay indoors with air conditioning whenever possible, drink plenty of fluids and avoid hiking or other strenuous activity in extreme heat.
Children and pets should never be left in unattended vehicles for even one minute.
