The tornado warning was triggered by a severe thunderstorm near Daly City that forecasters determined was capable of producing a tornado, with radar indicating rotation.
Residents were advised to take shelter immediately in a basement or interior room on the lowest floor, as flying debris was expected to pose a significant risk.
The system, moving northeast from Daly City at 45 mph, prompted alerts across San Francisco, Daly City, and Broadmoor, ending shortly after at 6:07 a.m.
Google also contributed to public safety by displaying a pop-up warning about the tornado risk, similar to alerts issued for previous weather events.
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