Support usNational Weather Service alerts off the feed, every storm cell tracked and scored, and GOES satellite lightning on one map. Level II radar, every tilt, in the app. Built by volunteers, paid for by people who chip in.
Severe weather alerts
A tornado on the ground covers about half a mile in the time it takes most weather apps to notice a warning has been issued. We take the National Weather Service on three independent feeds and send whichever arrives first, then reach you by push, email, text, phone call or webhook.
Every figure in this section is measured from our own arrival receipts over the last 24 hours and read live while you are on the page. If it cannot be measured it is not printed.
A warning on a muted phone across the room is not a warning. The call gets through Do Not Disturb and reaches a landline, which is still what the people most at risk in a tornado answer.
Nothing on the phone below was written for this page. Every line is the output of the same functions that composed the last warning we sent.
WxAlerts: Tornado Warning for Home until 0230Z. Reply STOP to cancel.
One segment, 69 characters. No app, no data connection.This is a weather alert from WX Alerts dot org. Tornado Warning for Home. Take shelter now. Again. Tornado Warning for Home. Take shelter now.
It repeats, because the first seconds of a call are spent working out what it is.The confirmation call when you add a number is also how ours gets saved in your phone. Carrier caller ID often shows no name at all, and an unnamed automated call at 2am is the one people hang up on.
Every channel gets its own rule on every place you save. The fastest alert in the world is worth nothing once you have muted it for crying wolf, so the loud channels stay reserved for the hazards that earn them.
The whole argument, with the measurements →Also included
Every convective cell tracked and scored while it is still a cell: how likely it is to turn severe, how likely it is rotating, and where its own motion puts it next. When a cell crosses the threshold and its track runs over a place you have saved, you hear about it — because that storm is coming at you, not because a county line moved.
Says rotating and severe-hazard likely. Never says tornado detectedHow it works, and how well →The whole volume scan rather than a flattened picture of it. Every elevation angle and every product the radar puts out, so you can climb a storm tilt by tilt and find the rotation at the height it is actually happening instead of guessing from the lowest slice.
In the app, on Pro and up: every tilt, every moment, every siteOrganizations
The same alert feed, storm analysis and lightning detection the public map runs on, pointed at every site your people work out of, with the alert going to whoever is on shift there.
Talk to usEducation and research use is covered by the API terms as they stand. Commercial, logistics and government deployments need a conversation first — we are a not-for-profit and we would far rather have it before you build than after.
Building something yourself? Everything above is on a public MQTT stream with documented payloads. Read the MQTT docs.
Nonprofit
Ingest, push notifications and the lightning feed cost money every month. A plan pays for that, and buys you more places to watch and more people to wake. The free tier is the whole point and is not going anywhere, so most of what we send is paid for by somebody who is not receiving it.
No ads, no data sales, and nothing safety-related behind a paywall. If you would rather just cover somebody else's alerts, you can do that instead.