You can call it weather whiplash. That’s what it will feel like this week as the Bay Area turns from unseasonably warm to wintry, wet and windy in the blink of an eye.
After a continuation of warm weather Monday, probably the warmest day of the week with San Francisco and Oakland pushing 80 degrees and even higher temperatures inland, the mild pattern will hold through Tuesday.
But the pattern flips quickly after that.
A deepening low-pressure system dropping south from the Gulf of Alaska will merge with a nearly stationary upper-level low lingering over the Pacific on Wednesday. That merger spins up a secondary low-pressure system closer to the California coast, a feature missing from recent weaker storms and one that will help squeeze out 6 to 8 hours of heavy rain from an active atmospheric river setup nearby…