Stories from behind WeatherAlarm

Storm Report replays a warning's entire life, at the exact address you're monitoring, entirely on-device — so you know what actually happened to the people you love, not just what might have.

WeatherAlarm is free, ad-free, account-free, and tracker-free. A walk through the engineering discipline that keeps it that way — from radar site activation, to edge caching, to pushing computation down to your phone.

On a highly forecasted severe weather day across the central US, WeatherAlarm delivered NWS warnings to monitored locations within seconds. Here's the day, by the numbers.