The National Weather Service has lifted the tornado threat for the city of San Francisco and a part of San Mateo County Saturday morning. The NWS initially sent a Tornado Warning at around 5:56 a.m. for northern San Mateo County and portions of downtown San Francisco. bay area weather 2 hours ago Forecast: Heavy overnight rain with clearing Sunday bay area weather Dec 11 Bay Area forecast: Coastal flood, high-surf advisories, rain timeline Radar detected possible tornado conditions near San Francisco, South San Francisco, and Pacifica around 5:55 a.m. The agency also reminds everyone of possible flash flooding due to torrential rains. Everyone is encouraged to stay vigilant and aware of weather conditions. This is a developing story. Check back for updates.