G-AIRMET
G-AIRMET is weather advisory issued by the U.S. National Weather Service. It warns pilots of widespread weather conditions that may affect flights, especially for general aviation and smaller aircraft.
G-AIRMETs are issued for three primary hazard categories:
Turbulence:
Moderate turbulence, Strong surface winds, Low-level wind shear
Icing:
Moderate icing, Freezing level
Ceilings and Visibility:
Widespread low ceilings, Reduced visibility (e.g., fog, precipitation)
API Usage
Our API provides two G-AIRMET endpoints that allow you to determine whether a given ICAO airport identifier or latitude/longitude coordinate falls within one or more active G-AIRMET polygons.
Raw, Short, or Decoded Responses
We offer two API response models for G-AIRMETs - Short and Decoded - allowing you to choose between a summary JSON data or full JSON data including GeoJSON polygon coordinate points for application use.
1. Short Response
Add /short to the end of the endpoint path to receive a simplified JSON response.
Example:
https://api.checkwx.com/v2/gairmet/ktpa/shortResponse:
{
"results": 1,
"data": [
{
"period": {
"issued": "2026-06-25T20:45:00Z",
"expires": "2026-06-26T03:00:00Z"
},
"product": "ZULU",
"altitude": {
"minimum": {},
"maximum": {
"feet": -1
}
},
"fzl_altitude": {
"minimum": {
"feet": -1
},
"maximum": {
"feet": -1
}
},
"hazard": {
"type": {
"code": "FZLVL",
"text": "Freezing level"
}
}
}
]
}2. Decoded Response
Add /decoded to the endpoint path to receive a full structured JSON format including GeoJSON polygon points.
Example:
https://api.checkwx.com/v2/gairmet/ktpa/decodedResponse:
{
"results": 1,
"data": [
{
"period": {
"issued": "2026-06-25T20:45:00Z",
"expires": "2026-06-26T03:00:00Z"
},
"product": "ZULU",
"altitude": {
"minimum": {},
"maximum": {
"feet": -1
}
},
"fzl_altitude": {
"minimum": {
"feet": -1
},
"maximum": {
"feet": -1
}
},
"hazard": {
"type": {
"code": "FZLVL",
"text": "Freezing level"
}
},
"geometry": {
"type": "LineString",
"coordinates": [
[
-92.4258,
58.3527
],
[
-92.1681,
58.0272
],
[
-91.0543,
57.838
],
[
-89.3815,
57.5881
],
[
-88.1602,
57.0703
],
[
-86.8951,
56.422
],
[
-85.6456,
55.998
],
[
-84.0426,
55.6433
],
[
-82.464,
55.2184
],
[
-81.637,
54.3195
],
[
-81.1312,
53.4893
],
[
-80.6622,
54.5764
],
[
-79.7276,
55.2206
],
[
-78.5302,
55.6925
],
[
-77.8587,
55.9559
],
[
-77.2563,
56.5272
],
[
-78.0102,
57.498
],
[
-78.3422,
57.8233
]
]
}
}
]
}G-AIRMET Covering ICAO
Returns all G-AIRMET polygons that are currently covering the specified ICAO
Endpoint Path
/v2/gairmet/{icao}
Path Parameters
icao
string
Required
A single ICAO code (multiple ICAO codes are not allowed)
TAF Nearest to Latitude/Longitude
Returns all G-AIRMET polygons that are currently covering the specified Latitude/Longitude
Endpoint Path
/v2/gairmet/lat/{latitude}/lon/{longitude}
Path Parameters
latitude
float
Required
The latitude in decimal degrees
minimum value: -90
maximum value: 90
longitude
float
Required
The longitude in decimal degrees
minimum value: -180
maximum value: 180
G-AIRMET Fields
The following table lists the fields which are returned by G-AIRMET endpoints
-
icao
string
Examples:
ICAO airport code or station indicator
KPIE -
name
string
Station name
John F Kennedy International Airport -
location
string
City, (State/Province), Country
New York, New York, United States -
period
object
-
issued
string
DateTime the G-AIRMET was issued
2025-12-24 16:00:00 -
expires
string
DateTime the G-AIRMET expires
2025-12-25 16:00:00
-