SAN DIEGO — Temperatures soared into the triple digits on Thursday in many San Diego County communities as a brutal heatwave continues to grip the region.
A high-pressure system will linger over the western United States until it is replaced by a low-pressure system on Saturday, keeping temperatures hot and dry through Friday in most areas, forecasters said.
A heat advisory was in effect in coastal areas until 8 p.m. Thursday.
The NWS also issued an Excessive Heat Warning for the western valleys that will last until 8 p.m. on Friday.
In addition to the advisories and warnings that were issued, Cal ISO issued a Flex Alert for all of California for Thursday afternoon and evening but San Diego was able to avoid any outages.
During Flex Alerts, which are called for 3 p.m. and 10 p.m., the ISO urges consumers to:
- Set air conditioning thermostats to 78 degrees, if health permits
- Defer use of major appliances
- Turn off unnecessary lights
- Unplug unused electrical devices
- Close blinds and drapes
- Use fans when possible
- Limit time the refrigerator door is open
Consumers can also take steps to prepare for the Flex Alert by doing the following before 3 p.m.:
- Pre-cool” their homes, or lower air conditioning thermostats
- Charge electric vehicles
- Charge mobile devices and laptops
- Run dishwashers, washing machines and other major appliances
- Set pool pumps to run in the early morning or late at night
Residents are advised to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun and check up on relatives and neighbors, according to the NWS. The agency also stresses that children, seniors and pets must never be left in a vehicle parked in hot weather, even with windows open, as interior temperatures can rapidly turn lethal.
Temperatures could reach 104 in a few western valley communities on Friday, then drop to 96 on Saturday, forecasters said. Highs in the deserts are expected to reach 112 on Friday before sliding to 109 on Saturday.
To help residents escape the heat, the county is offering nine air-conditioned cooling centers in Alpine, Borrego Springs, Fallbrook, Lakeside, Potrero, Ramona, Santa Ysabel, Spring Valley and Valley Center.
Due to the coronavirus, mandatory mask-wearing and social-distancing protocols are enforced in the facilities. A full list of the locations can be found here.