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Active weather warnings

9.3 million people are under a high wind warning in California · 216 active across the country, 71 of them warnings · From the National Weather Service

Map of the contiguous United States with every county under an alert shaded by the most urgent one over it
Every county under an alert right now, shaded by the most urgent one over it. Alaska, Hawaii and Puerto Rico are in the list below.

Severe thunderstorm · 1Flash flood · 2Flood · 12Winter · 7Fire weather · 4Marine · 156Statement · 4Other · 30

This is a relay, not a warning system. Everything here comes from the National Weather Service and can lag. For anything affecting your safety, use weather.gov and local officials.

Most people affected

Estimated from the population of incorporated places inside each alert. An approximation, not a census - see the note below.

By state

Oklahoma11Texas11New Mexico9Louisiana5California3Colorado3Arizona3Mississippi2Arkansas2Wyoming2Nebraska2South Dakota2Guam2Northern Mariana Islands2Georgia1Nevada1Kansas1Montana1Kentucky1

How “people affected” is worked out

A count of active warnings tells you almost nothing. A tornado warning over open ranchland and one over a metro area look identical in a list and are completely different events, so this page ranks by who is actually inside.

For a short-fused warning the Weather Service draws a polygon, and we sum the population of every Census place whose centre falls inside it. Longer-fused products - heat, winter, air quality - are issued against counties instead, so those are summed by county.

Both are estimates and the limits are worth stating. A city counts fully or not at all depending on which side of the boundary its centre falls, and anyone living outside an incorporated place is not counted. Large cities land wholly in one county - New York City’s centre is in Kings County, so an alert covering only Manhattan reports a fraction of the people actually under it. It is a ranking signal, not a headcount.

Source: National Weather Service alert feed (api.weather.gov), read every two minutes. County lines from the US Census Bureau; populations from the Census place list.