---
title: "GET /aviation/sigmets/{atsu}/{date}/{time}"
method: GET
path: "/aviation/sigmets/{atsu}/{date}/{time}"
---

# GET /aviation/sigmets/{atsu}/{date}/{time}

`GET /aviation/sigmets/{atsu}/{date}/{time}`

## Request

- Base URL: `https://api.weather.gov`
- URL: `https://api.weather.gov/aviation/sigmets/{atsu}/{date}/{time}`
- Auth: one of:
  - API key in header `User-Agent`
  - API key in header `API-Key`

Returns a specific SIGMET/AIRMET

## Path parameters

- `atsu` string, required: ATSU Identifier
- `date` string, date, required: Date (in YYYY-MM-DD format).
- `time` string, required: A time (in HHMM format). This is always specified in UTC (Zulu) time.

## Response `200`

success

- SigmetGeoJson: A GeoJSON feature. Please refer to IETF RFC 7946 for information on the GeoJSON format.
  - `@context` union
    - unknown[]
      - unknown
    - object
  - `id` string, uri
  - `type` 'Feature', required
  - `geometry` union, required: A GeoJSON geometry object. Please refer to IETF RFC 7946 for information on the GeoJSON format.
    - object
      - `type` 'Point', required
      - `coordinates` number[], required: A GeoJSON coordinate. Please refer to IETF RFC 7946 for information on the GeoJSON format.
      - `bbox` number[]: A GeoJSON bounding box. Please refer to IETF RFC 7946 for information on the GeoJSON format.
    - object
      - `type` 'LineString', required
      - `coordinates` GeoJsonCoordinate[], required: A GeoJSON line string. Please refer to IETF RFC 7946 for information on the GeoJSON format.
        - number[]: A GeoJSON coordinate. Please refer to IETF RFC 7946 for information on the GeoJSON format.
      - `bbox` number[]: A GeoJSON bounding box. Please refer to IETF RFC 7946 for information on the GeoJSON format.
    - object
      - `type` 'Polygon', required
      - `coordinates` array[], required: A GeoJSON polygon. Please refer to IETF RFC 7946 for information on the GeoJSON format.
        - GeoJsonCoordinate[]
          - number[]: A GeoJSON coordinate. Please refer to IETF RFC 7946 for information on the GeoJSON format.
      - `bbox` number[]: A GeoJSON bounding box. Please refer to IETF RFC 7946 for information on the GeoJSON format.
    - object
      - `type` 'MultiPoint', required
      - `coordinates` GeoJsonCoordinate[], required
        - number[]: A GeoJSON coordinate. Please refer to IETF RFC 7946 for information on the GeoJSON format.
      - `bbox` number[]: A GeoJSON bounding box. Please refer to IETF RFC 7946 for information on the GeoJSON format.
    - object
      - `type` 'MultiLineString', required
      - `coordinates` GeoJsonLineString[], required
        - GeoJsonCoordinate[]: A GeoJSON line string. Please refer to IETF RFC 7946 for information on the GeoJSON format.
          - number[]: A GeoJSON coordinate. Please refer to IETF RFC 7946 for information on the GeoJSON format.
      - `bbox` number[]: A GeoJSON bounding box. Please refer to IETF RFC 7946 for information on the GeoJSON format.
    - object
      - `type` 'MultiPolygon', required
      - `coordinates` GeoJsonPolygon[], required
        - array[]: A GeoJSON polygon. Please refer to IETF RFC 7946 for information on the GeoJSON format.
          - GeoJsonCoordinate[]
            - number[]: A GeoJSON coordinate. Please refer to IETF RFC 7946 for information on the GeoJSON format.
      - `bbox` number[]: A GeoJSON bounding box. Please refer to IETF RFC 7946 for information on the GeoJSON format.
  - `properties` object, required
    - `id` string, uri
    - `issueTime` string, date-time
    - `fir` string, nullable
    - `atsu` string: ATSU Identifier
    - `sequence` string, nullable
    - `phenomenon` string, uri, nullable
    - `start` string, date-time
    - `end` string, date-time

## Other responses

- `default`: An error response.

## Changes

- **2026-07-13** `941dbd15eabe`: 1 breaking
  - added `subschema #7` to the `allOf[#/components/schemas/GeoJsonFeature]/geometry` response property `oneOf` list for the response status `200`

[Operation history](https://skmtc.dev/weather/apis/weather-gov-api/changes/aviation/sigmets/:atsu/:date/:time/get.md)

---

[API](https://skmtc.dev/weather/apis/weather-gov-api.md) - [All operations](https://skmtc.dev/weather/apis/weather-gov-api/llms.txt) - [OpenAPI document](https://skmtc.dev/weather/apis/weather-gov-api/revisions/ed43606f373e?raw)