Southern California is facing an exceptionally long heat wave, with conditions expected to persist through mid-October, according to forecasters. The extreme heat watch went into effect for Orange County and surrounding regions on Friday morning.
The National Weather Service in San Diego has issued an extreme heat watch for inland and coastal areas of Orange and San Diego counties, as well as parts of San Bernardino and Riverside counties. This watch is set to continue through Wednesday night. Separately, an extreme heat watch is in effect for the L.A. County region through October 8, with the possibility of extension.
Saturday is expected to be the peak of this heat event, with temperatures forecast to reach triple digits in some areas. Downtown Los Angeles and Pasadena are predicted to hit 100 degrees, while Paso Robles could see 101 degrees and Ojai 102 degrees. Temperatures in Orange County are also expected to be significantly elevated.
Rose Schoenfeld, a meteorologist with the National Weather Service in Oxnard, noted that this event stands out, stating it is "one of the longer-duration ones that I’ve seen in my time at this office." She explained that high pressure in Southern California, combined with a lack of wind, is driving the heat wave. Weather service models suggest the heat may last through the middle of the month, without a clear cutoff.
This prolonged heat follows a summer characterized by unusually damp and warm conditions, attributed to tropical storm remnants and elevated ocean temperatures. These summer conditions also led to a rise in West Nile virus cases in Los Angeles County, as mosquitoes thrived.
Fortunately, the National Weather Service expects this particular heat event to be less humid than the summer's conditions, Schoenfeld confirmed. However, a storm that is not projected to make landfall could bring some moisture to Southern California over the weekend and into Monday. This might result in elevated humidity and a slight chance of thunderstorms and cloud coverage in mountainous areas, though not enough to significantly cool temperatures across the region.
In light of the anticipated heat, the National Weather Service advises residents to take precautions. The public is encouraged to drink plenty of fluids, seek air-conditioned environments, stay out of the sun during peak hours, and check on relatives and neighbors. Furthermore, a critical warning has been issued: Do not leave young children and pets in unattended vehicles, as car interiors can reach lethal temperatures rapidly.
While this heat wave arrives after the official end of summer, meteorologists note that October heat events are normal for the Los Angeles region, where the warm season typically extends from June through October.
