From Daniel Swain at the California Weather Blog:
A relatively cold late-season low pressure system is currently diving southward along the West Coast after bringing some spring downpours in the Pacific Northwest.
Strong surface pressure gradients associated with this incoming low have already generated strong winds across much of California, including some pretty impressive gusts at San Francisco International Airport. This cold low will continue to sink southward over the next 48 hours, bringing with it increasingly unsettled weather conditions across the northern half of the state. Showers and thunderstorms will begin tomorrow at higher elevations and possibly spread across the Sacramento Valley by evening. As colder air aloft settles into the region and lapse rates steepen, the atmosphere will continue to destabilize through Saturday. By later Saturday afternoon, showers and thunderstorms may be pretty widespread across Northern California, likely including most of the Central Valley and much of the Bay Area. In fact, some of the same areas that have seen unusually active weather and powerful thunderstorms in recent weeks may see yet more this weekend.
Continue reading at the California Weather Blog here: Unsettled late spring conditions in NorCal; La Niña Looms
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