The map is free. Alerts for the places you name are $5 a month.
Pro checks your places against every warning, every 30 seconds, and messages you when a warning or a storm's path reaches one of them. That's the whole product.
| Free$0 | Pro$5 a month, or $40 a year | Chaser$25 a month, storm season only if you like | APIfrom $200 a month | |
|---|---|---|---|---|
| The live map: warnings, radar, watches, forecaster notes, today's risk | Yes | Yes | Yes | — |
| Places we check against each warning | 1 | 10 | 25 | Unlimited |
| Messages by email | Yes | Yes | Yes | — |
| Messages by text and phone notification | — | Yes | Yes | — |
| Storm headed your way: a message when the path will reach you, before the warning is redrawn | — | Yes | Yes | Yes |
| Family: one plan covers everyone's phone | — | Up to 5 people | Up to 5 people | — |
| Ads | One small ad, never while a warning is near you | None | None | — |
| Spotter mode plus forecaster analysis layers (instability, wind shear, tornado parameter) | — | — | Yes | — |
| Model soundings at any point you tap | — | — | Yes | — |
| Radar history | 50 minutes | 50 minutes | 3 hours, with radar wind | — |
| Past 48 hours of warnings on the map | — | Yes | Yes | Full archive |
| Warning feed as JSON: shapes, motion, hail and wind tags | — | — | — | Yes |
| A call to your server when a warning enters an area you define | — | — | — | Yes |
| Start free | Try Pro free for 30 days | Join the Chaser waiting list | Email us |
Swipe the table sideways to compare plans.
US dollars. Cancel whenever. Spotter mode is free while it is new.
Your address instead of your county
The emergency alert on your phone goes out by county. The Weather Service draws each warning as a shape, so we check whether each of your places is inside the shape and tell you.
Sent within a minute
We read the Weather Service feed every 30 seconds. The storm-headed-your-way message uses the speed and direction forecasters print in the warning, so it can reach you before the warning shape is extended over your house.
Everywhere the Weather Service draws a shape
Tornado, severe thunderstorm, flash flood, extreme wind, snow squall, dust storm and marine warnings, anywhere in the US and its territories.
Keep your weather radio
The internet can be slow or down in a storm. During a warning, also listen to local radio or TV. Every message we send says so.
Questions
Where does the data come from?
From public agencies, and we are grateful for it. Warnings come from the National Weather Service. Watches, forecaster notes and the daily risk outlook come from the Storm Prediction Center. Storm cells and their tornado probabilities come from the National Severe Storms Laboratory's ProbSevere system, published through NOAA's open data program. Radar is the NEXRAD network, with imagery and spotter reports served by the Iowa Environmental Mesonet at Iowa State University. All of it is free to the public. You pay us for checking it against your places and sending the message.
Why is the map free if it costs money to run?
Because the data is public, and someone standing in a warning shouldn't have to pay to see it. Pro and API customers cover the hosting, plus one small ad on the free map that goes away whenever a warning is near you.
Can I pay only during storm season?
Yes. Turn it on in April and off in July. There is no cancellation fee.
Does it work outside the United States?
Not yet. We read the Weather Service feed, which covers the US and its territories.