NWS alerts, SPC outlooks and watches, NEXRAD radar, GOES-16 satellite, upper-air soundings, HRRR forecasts, and USGS river gauges — ingested, normalized, and mapped together.

Location-first

Know your place

Search any city, ZIP, or address. See every active alert, outlook, storm report, and current observation at that exact point. Share a link anyone can open to see the same view.

Pro tools

Not just a pretty map

Animated radar loops, Skew-T soundings with derived parameters, HRRR point forecasts, interactive SPC outlook categories, and a developer API — all free.

For developers

One API for severe weather.

Normalized GeoJSON. Consistent spatial queries. GeoJSON output by default. Rate-limited but generous.

Query active alerts, SPC outlooks, watches, mesoscale discussions, storm reports, surface observations, upper-air soundings, radar tiles, satellite imagery, river gauges, or HRRR point forecasts from a single consistent API.

Try it live Read the docs

curl

$ curl "https://atmostorm.com/api/v1/alerts?state=OK&active=true&severity=Extreme"

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": { "type": "MultiPolygon", ... },
      "properties": {
        "event": "Tornado Warning",
        "severity": "Extreme",
        "urgency": "Immediate",
        "headline": "...",
        "expires": "2026-04-18T22:15:00Z"
      }
    }
  ]
}

Data sources

Trusted public data. Credited and cited.

Atmostorm doesn't own the weather. It organizes it. Every data source is attributed in-app and linked in our docs.

NWS

National Weather Service — alerts, forecasts, observations

SPC

Storm Prediction Center — outlooks, watches, discussions

IEM

Iowa Environmental Mesonet — radar, CWOP, archives

NASA GIBS

GOES-16 satellite imagery

NOAA HRRR

High-resolution rapid refresh model

USGS

Real-time river and stream gauges

NOAA NWPS

National Water Prediction Service — flood stages

Open-Meteo

Gridded current conditions and forecasts

Get the full picture.

Free to use. Open to developers. Supported by donations from the people who use it.

Open the map Support the project