Agency
NWS
Refresh cadence
every 6 hr
Last successful sync
Pending first sync
Pipelines
gairmet_sync
Category
Safety
About this dataset
G-AIRMET mountain-obscuration polygons critical for VFR mountain operations. Mountain-obscuration polygons + validity windows. AI Copilot warns when route crosses obscured terrain.
Where this feed reaches
- Continental United States
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 you'll see it in AeroCopilot
Upstream publisher
aviationweather.gov/data/api/AeroCopilot is the canonical pipeline for this dataset inside the product. The link above goes to the upstream publisher for full documentation and data licensing.