A high-pressure system is expected to build over Los Angeles bringing potentially dangerous heat and humidity that could generate more thunderstorms in the mountains and deserts.
An excessive heat warning has been extended through Saturday evening for the San Fernando and Santa Clarita valleys, as well as the San Gabriel and Santa Monica mountain ranges.
A list of cooling centers has been posted online.
Whether storms develop or not, it is definitely going to be hot, and Los Angeles County is going to be hotter than Orange County again, according to forecasts.
The potential for afternoon thunderstorms could mean more hail and rain, as well as lightning-strike fire starts and flash flooding, which could be a concern in previously burned areas on the north side of the San Gabriels, National Weather Service meteorologist Andrew Rorke said.
In downtown Los Angeles, Hollywood and Malibu, the high is expected around 94, about the same as Anaheim, according to the Weather Service.
Pasadena can expect a high of 102 or hotter, with a 10 percent chance of thunderstorms. The forecast high in Santa Clarita Friday is 105, with a 10 percent chance of thunderstorms.
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Further north, Palmdale's high will be about 106 with a 20 percent chance of thunderstorms.
Down in Palm Springs and further east to Blythe, highs around 113 are expected again, with a high of 115 forecast in Blythe, according to the Weather Service.
The Los Angeles County Department of Public Health earlier this week issued a warning for residents of Lancaster and other parts of the Antelope Valley to take precautions as the heat wave settles in.
