An atmospheric river moved into the Bay Area late Wednesday and continued through Thursday, delivering a powerful surge of rain and strong winds that disrupted travel, caused flooding concerns and led to isolated property damage and school closures. The storm system, which forecasters had been tracking earlier in the week, arrived with enough intensity to prompt weather advisories across all nine Bay Area counties as residents faced the first significant rainfall event of the season.
The National Weather Service issued an expanded flood advisory covering the entire Bay Area through 10 a.m. Thursday, warning that excessive rainfall could overwhelm drainage systems and lead to rapid pooling of water on roads and in low-lying neighborhoods. Forecasters emphasized that even brief periods of heavy rain were capable of creating hazardous conditions during the morning commute, especially in areas already prone to flooding during significant weather events.
The effects of the storm were immediately evident at San Francisco International Airport, where wind and rain contributed to inbound flight delays averaging nearly two hours, according to information from federal aviation authorities. Airport officials urged travelers to check with airlines before heading to the terminals, noting that weather-related slowdowns are common during atmospheric river events when strong winds can affect landing patterns and visibility.
In the North Bay, the storm brought down at least one tree in Santa Rosa. The fallen tree landed in front of a home, damaging a fence and portions of the property. While debris scattered across the yard and repair work will be needed, the tree did not strike the main structure of the house, and no injuries were reported. Crews were called to the scene to begin clearing the area as gusty conditions continued throughout the morning.
Sonoma County experienced additional impacts as the storm moved inland. Horicon Elementary School in the small coastal community of Annapolis was forced to close on Thursday due to a power outage caused by the weather. The loss of electricity left the school unable to operate safely, and administrators notified families early in the morning about the closure. Utility crews were working to restore power, but ongoing wind and rain created challenges that could delay repairs.
Across the region, residents prepared for continued periods of unsettled weather as the atmospheric river maintained its path over Northern California. Local authorities urged caution on wet roads, particularly in areas where fallen leaves and debris could block storm drains. While the system was expected to weaken gradually after moving eastward, forecasters noted that lingering showers and breezy conditions could persist through the day.
The storm served as a reminder of the seasonal weather patterns that often affect the Bay Area during fall and winter, when atmospheric rivers can deliver both much-needed rainfall and sudden disruptions. As cleanup efforts begin and conditions slowly stabilize, officials encouraged residents to stay alert for additional advisories, especially in regions vulnerable to flooding or wind damage.
