High temperatures today will be 105 to 110 in Riverside and Lake Elsinore, 92 to 99 in the mountains, 109 to 114 in the San Gorgonio Pass and 109 to 114 in the Coachella Valley.
San Francisco itself saw one of the hottest days in its history Friday at 106 but is now expected to recede into its usual cool-and-foggy summer pattern with dramatic temperature drops into the 80s then the 70s.
The National Weather Service warns that the heat will bring a high risk of heat-related illness, especially for the elderly, the infirm and children. Areas inland from the San Francisco Bay Area could reach 115 (46 C), a temperature last seen in 1950, forecasters said. Tens of thousand of people lost power at times on Friday and managers of California's power grid asked for voluntary electricity conservation, the Associated Press reported.
San Francisco's transit system is cutting its speed to guard against possible heat-warped rails as the Bay Area breaks heat records for a second day.
In addition, the Oregon Department of Environmental Quality has extended the current Air Quality Alert until further notice, meaning wildfire smoke will continue to pour into the southwest part of the state.
Forecasters said more heat could be expected when remnants of Tropical Storm Lidia move north from Mexico's Baja California during the weekend. The Watch runs from early Friday through Sunday evening.
However, before showers and relief arrive, this moisture will also act to increase the dew points, making it feel more humid and exacerbating the heat in parts of southern California through Sunday.
High temperatures in the desert included 116 degrees in Palm Springs, 114 degrees in Thermal and 113 degrees in Indio. However, this ridge will remain in place over the Pacific Northwest. This story does not necessarily represent the position of our parent company, IBM.