High heat generated by a strong ridge of high pressure kept the Southland baking for another day Tuesday, but forecasters said relief is in sight.
A heat advisory, which warns of hot temperatures able to cause heat-related illnesses, will be in effect in the San Fernando, San Gabriel and Santa Clarita valleys, the Santa Monica Mountains Recreational area, the L.A. County Coast, beach cities and metropolitan Los Angeles until 9 p.m., thanks to temperatures expected in the 90s and into the triple digits, according to the National Weather Service.
No advisory was issued for the San Gabriel Mountains, where temperatures were only forecast in the 80s. No special advisory was issued for the Antelope Valley. Highs that area stretched over 100, but that’s not uncommon as summer approaches.
The heat advisory extends as far east as Pomona.
In Orange County, a heat record was set in Anaheim, where the temperature reached 91 degrees, breaking the record for this date of 90 degrees, set in 1995.
The high temperatures prompted the California Independent System Operator, which manages the state’s power grid, to issue a Flex Alert until 10 p.m. The alert is a call for residents to voluntarily reduce their power use to ease strain on the grid by turning off unneeded lights and avoiding use of major appliances. The alert also urges people to set their air conditioners to at least 78 degrees.
The hot spell is likely to start dissipating Wednesday as the ridge of high pressure begins breaking down and the marine layer deepen, forecasters said.
“The high pressure will weaken on Wednesday, increasing onshore flow and cooling temperatures down,” according to the NWS. “Temperatures will continue to cool on Thursday and through the weekend as the marine layer strengthens, bringing overnight and morning low clouds back into the valleys.”