I built a Red Flag Warning zone-check tool for the East Bay in 48h
Hey HN. I'm a high schooler in Fremont, CA. Tuesday morning I got a county-wide AC Alert text telling everyone in Alameda County to prepare a go-bag for an East Bay Hills Red Flag Warning that starts tonight at 11 PM. The text went to ~half a million phones. The actual NWS warning polygon only covers East Bay Hills (NWS zone CAZ515). Most people who got the text don't need a go-bag tonight. Some in the hills don't realize how close they are. So I built this tool - https://redflag-check.info/ mit licensed public github -…
I built a Red Flag Warning zone-check tool for the East Bay in 48h launched on June 11, 2026 with 17 votes, #930 of 22,647 launches that month and more than 90% of that year's launches.
In plain words
A Red Flag Warning zone-check tool for the East Bay that helps residents determine if they are within active fire warning areas. Built by a high school student in response to overly broad emergency alerts sent to entire counties, the tool allows users to check their location against actual National Weather Service warning polygons and send notifications to others. It requires no app installation and is open-source under MIT license.
written from the facts on this page · September 2026
From the sources
Type your address. Find out if the active Red Flag Warning actually covers you, what to do tonight, and your evacuation zone. Free. No signup.
📱 Built for phones. Try it on your mobile for the best experience. redflag-check.info is free and requires no sign-up. It uses official NWS data. It is not affiliated with any government agency. A Red Flag Warning (RFW) is an alert issued by the National Weather Service (NWS) that dangerous conditions are expected within 24 hours — the combination of strong winds, low humidity, and dry vegetation creates an extreme risk for the rapid ignition and spread of wildfire. It's a heads-up to be ready, not an evacuation order. This tool tells you whether the active RFW Affected Area covers your specific address. Check an address on the “Your address” tab and the closest schools appear here — or…from redflag-check.info
In the maker’s words, at launch
Hey HN. I'm a high schooler in Fremont, CA. Tuesday morning I got a county-wide AC Alert text telling everyone in Alameda County to prepare a go-bag for an East Bay Hills Red Flag Warning that starts tonight at 11 PM. The text went to ~half a million phones. The actual NWS warning polygon only covers East Bay Hills…
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