A History of Tornadoes in San Francisco

Geography and storm exposure

San Francisco is part of the Pacific coast and western interior valleys. Cold-core lows, winter thunderstorms and narrow convective lines can generate brief rotation. Geography influences storm boundaries and exposure, but terrain, rivers and buildings do not create a dependable tornado shield.

Events are less frequent than on the Plains, but dense development can make a short track consequential. This page uses the incorporated city as its population reference and the surrounding region for meteorological context; those boundaries answer different questions and are labeled separately.

Important tornadoes to place in context

These events are starting points, not a claim that every path crossed San Francisco's incorporated limits. Tornadoes are surveyed by path and county; metropolitan labels in news coverage often describe a broader area.

Why the historical record changes over time

Older records favor destructive tornadoes that crossed settled places. Radar, trained spotters, phones and systematic damage surveys now capture many weak or brief events that earlier observers could miss. Apparent increases can therefore reflect detection and urban growth as well as weather variability.