A powerful storm struck the San Francisco Bay Area and Central Coast on Christmas Day, bringing damaging winds, heavy rainfall, and flash flooding. The National Weather Service reported that while the main rain band shifted eastwards early Thursday, the effects were ongoing with significant runoff affecting urban areas.
Intense rain and wind prompted the issuance of severe thunderstorm and flash flood warnings overnight. Forecasters indicated that this storm could be just a precursor to even more severe weather, anticipated by midnight Friday morning. Wind gusts were recorded at alarming speeds; areas like northwestern San Mateo County experienced gusts up to 92 mph, while Santa Cruz Harbor and the Marin County highlands recorded 91 mph and 90 mph, respectively. Downtown San Francisco reported 0.74 inches of rain overnight within just a 12-hour span.
Emergency officials highlighted significant roadway flooding, downed trees, and blocked power lines, urging drivers to avoid flooded roads as the potential for travel disruptions continued. A flood watch remains in effect through Friday evening, with risks of flash floods and landslides due to high rates of rainfall. With another line of thunderstorms expected to form late Thursday afternoon and evening, additional weather warnings were issued.
The National Weather Service pointed out that Christmas travel could be heavily affected by power outages, flooding, and debris on roadways. Dangerous marine conditions were also a concern, as gale-force winds and hazardous seas along the Pacific coast led to warnings and beach hazard advisories.
Forecasters noted the chance of severe thunderstorms until Thursday evening, including risks of brief tornadoes or waterspouts making landfall. However, conditions are expected to improve by early Friday, with winds easing and showers decreasing. A shift to northerly winds is predicted for Friday evening, leading to a drier and cooler weekend.
As the weekend approaches, clearer skies and cooler nights are anticipated from Saturday through Tuesday, providing a calmer weather pattern across much of Northern California. Looking ahead, meteorologists are monitoring another potential storm system expected around January 1 or 2, which coincides with King Tides, although major impacts are not currently anticipated.