A ridge of high pressure will expand its heat across the West Coast on Thursday and a warming trend across much of Northern California is set to pick up. This warmth will continue to build across the North Bay, East Bay and South Bay before some of it eventually begins spilling into communities along San Francisco Bay by Friday.
Weather models are signaling a sharp rise in daytime temperatures between Thursday and Saturday as the ridge reaches its maximum intensity. And that will lead to some far-reaching heat concerns as some Bay Area cities are set to experience their first 90-degree day of the year.
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