Agency
NOAA
Update cadence
Issued as needed, polled every 15 minutes
Category
Weather
What we ingest
Watch boxes unioned from the per-county WWA segments — category, onset and expiry, issuing office and VTEC event number — together with the 7 WWP probabilities (2+ tornadoes, EF2+ tornado, 10+ severe wind events, 65kt+ wind, 10+ severe hail events, 2in+ hail, and 6+ combined events). Every probability carries a bound qualifier, so a scale floor such as "<02%" is never published as though it were a measurement; we also store max tops in feet MSL, storm motion, and — when the SPC publishes it — the "particularly dangerous situation" qualifier.
Where this feed reaches
A region on this list means we fetch it. It is not a promise of station density: a listed region can still have sparse or no reporting sites near a given airport. Where a feed does not reach a region at all, this page says so instead of showing an empty panel.
- Continental United States
How AeroCopilot uses it
Map overlay + ground-stop guidance for affected airports.
Powers these features
The product surfaces below depend on this feed.
Map hazards layer
Upstream source: https://www.spc.noaa.gov/products/watch/
Cite this
PermalinkAeroCopilot — SPC Watches (Severe Thunderstorm + Tornado). Data: NOAA (https://www.spc.noaa.gov/products/watch/). https://www.aerocopilot.ai/data-sources/spc-watches.
Try the AI Copilot with this data
The Copilot has live access to SPC Watches (Severe Thunderstorm + Tornado) during every conversation.