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LOS ANGELES (CNS) - A high pressure system is driving up temperatures across much of the region Friday, with the heat expected to intensify over the next two days.
According to the National Weather Service, the heat will peak Friday and Saturday, "with highs approaching 100 in the warmest valleys and even low to mid 80s across inland portions of the coastal plain."
Forecasters said temperatures "will be very close to daily records in the valleys."
A heat advisory will be in effect from 10 a.m. Friday through 9 p.m. Saturday for the Santa Clarita Valley, the Santa Monica Mountains Recreational Area, Calabasas, Agoura Hills, the San Fernando Valley and the San Gabriel Valley. Forecasters warned that with temperatures potentially reaching triple digits, there will be a heightened risk of heat illness for sensitive populations, such as the very young, the very old and people without air conditioning.
"Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors," the NWS advised. "Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke."
Temperatures along the coast should remain fairly mild thanks to an onshore flow and marine layer. And conditions should start cooling by Sunday.
"The high pressure ridge will shift east late Saturday into Sunday allowing cooler air from the ocean to surge inland," according to the NWS. "The timing of this surge will determine how much temperatures drop on Sunday."
Temperatures could still reach into the 90s on Sunday in the valleys.
"Much cooler temperatures" are anticipated by the middle of next week, forecasters said.