Early next week the high-pressure system is anticipated to weaken, but the system will still be warmer than normal.
High-pressure System
Into the weekend, more intense weather will bake parts of the Southland and there is a possibility the Antelope Valley and Santa Clarita Valley will feel the brunt of the high-pressure system.
In response to the predicted high temperatures, the Los Angeles County Department of Public Health issued a heat alert. This alert will remain active in the western San Fernando Valley from Friday through Sunday, and in the eastern San Fernando Valley and the San Gabriel Valley from Saturday through Sunday.
Residents that do not possess air conditioner in their homes can make good use of cooling centers. Cooler temperature will be attained along the coast because of persisting onshore flow.
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Flex Alert
The managers of the state's power grid - The California Independent System Operator, has declared a Flex Alert. This is a call for voluntary conservation in expectations of decreasing strain on the system and avoiding outages - that will occur from 4 to 9 p.m. Friday.
Cal-ISO officials encouraged homeowners to leave their thermostats at 78 degrees or higher during the alert, avoid the usage of major appliances and switch all irrelevant lights off. Residents should also put pre-cooling their homes into consideration before the beginning of the alert and use window coverings so as to keep rooms cool.
In the Antelope Valley through 9 p.m. Monday, an extreme heat warning will be active with the National Weather Service forecasting "risky hot conditions with temperatures about 113 anticipated.
Temperatures won't dramatically decrease overnight in the region with lows anticipated in the mid-70s to mid-80s, Forecasters said.
Daily-record Levels
According to the NWS, more powerful upper level high pressure lead to extremely hot temperatures in the mountains, interior valleys, and deserts through the beginning of next week, with temperatures that are above normal mostly everywhere away from the coast.
On Friday, the excessive heat warning could possibly be stretched to the Santa Clarita Valley and beyond, this depends on how the high-pressure system unfolds, Forecasters said. For the now, the NWS issued a less strict heat advisory for the Santa Clarita Valley that will be active from 10 a.m. Friday until 9 p.m. Sunday, and expected temperatures up to 105 degrees.
From 10 a.m. Friday to 9 p.m. Monday, a heat advisory will be in effect for Los Angeles County mountains, with the exception of the Santa Monica range. Forecasters said less intense elevations could see temperatures reaching 106 degrees.
A persistent onshore flow will make temperatures remain cooler along the coast.
While the weather is anticipated to be hot, forecasters reveal temperatures will possibly stay just shy of everyday-record levels, which are in the range of 110-115, and "definitely short of 113-117 range of all-time records."
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