When torrential rains swept through Kerr County, Texas this summer, the Guadalupe River surged 26 feet, and at least 100 people died, many of them children.

What failed wasn’t just the forecast. It was a government that had the chance to act and didn’t. Officials had rejected sirens, sensors, and alerts for years, calling them too expensive or unnecessary. They relied instead on informal “river watchers” and outdated infrastructure. People paid with their lives.

San Francisco doesn’t have to worry much about deadly flash floods, at least not so far. But there are other serious climate disasters that face the city—and not just earthquakes.

San Francisco’s topography creates dangerous temperature spikes, sometimes up to 20 to 40 degrees between neighborhoods. This may be the coldest summe

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