Aviation Weather Center · JSON Structure
Aviationweather Taf Structure

Decoded TAF as returned by GET /api/data/taf?format=json.
Type: object Properties: 15 Required: 4
AviationWeatherGovernmentNOAANWSMETARTAFPIREPSIGMETAIRMETOpen DataPublic APIs
AviationWeather Terminal Aerodrome Forecast (TAF) is a JSON Structure definition published by Aviation Weather Center, describing 15 properties, of which 4 are required. It conforms to the https://json-structure.org/meta/core/v0/# meta-schema.
Properties

icaoId dbPopTime bulletinTime issueTime validTimeFrom validTimeTo rawTAF mostRecent remarks lat lon elev prior name fcsts
Meta-schema: https://json-structure.org/meta/core/v0/#
JSON Structure

{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/aviationweather/refs/heads/main/json-structure/aviationweather-taf-structure.json",
  "name": "AviationWeather Terminal Aerodrome Forecast (TAF)",
  "description": "Decoded TAF as returned by GET /api/data/taf?format=json.",
  "type": "object",
  "required": [
    "icaoId",
    "rawTAF",
    "validTimeFrom",
    "validTimeTo"
  ],
  "properties": {
    "icaoId": {
      "type": "string",
      "description": "ICAO identifier of the forecast site."
    },
    "dbPopTime": {
      "type": "string",
      "description": "Time product was received."
    },
    "bulletinTime": {
      "type": "string",
      "description": "Official bulletin time."
    },
    "issueTime": {
      "type": "string",
      "description": "Time the TAF was issued."
    },
    "validTimeFrom": {
      "type": "int32",
      "description": "Start of validity period (UNIX epoch seconds)."
    },
    "validTimeTo": {
      "type": "int32",
      "description": "End of validity period (UNIX epoch seconds)."
    },
    "rawTAF": {
      "type": "string",
      "description": "Raw TAF text."
    },
    "mostRecent": {
      "type": "int32",
      "enum": [
        0,
        1
      ],
      "description": "1 if most recent TAF for the site."
    },
    "remarks": {
      "type": [
        "string",
        "null"
      ],
      "description": "Additional remarks."
    },
    "lat": {
      "type": "double",
      "description": "Latitude (decimal degrees)."
    },
    "lon": {
      "type": "double",
      "description": "Longitude (decimal degrees)."
    },
    "elev": {
      "type": "int32",
      "description": "Elevation (meters)."
    },
    "prior": {
      "type": "int32",
      "minimum": 0,
      "maximum": 9,
      "description": "Site priority for progressive disclosure."
    },
    "name": {
      "type": "string",
      "description": "Full name of the site."
    },
    "fcsts": {
      "type": "array",
      "description": "Individual forecast periods within the TAF.",
      "items": {
        "type": "object",
        "properties": {
          "timeFrom": {
            "type": "int32",
            "description": "Forecast validity start (UNIX epoch)."
          },
          "timeTo": {
            "type": "int32",
            "description": "Forecast validity end (UNIX epoch)."
          },
          "timeBec": {
            "type": [
              "integer",
              "null"
            ],
            "description": "End of BECMG transition (UNIX epoch)."
          },
          "fcstChange": {
            "type": [
              "string",
              "null"
            ],
            "enum": [
              null,
              "TEMPO",
              "FM",
              "BECMG",
              "PROB"
            ],
            "description": "Change type."
          },
          "probability": {
            "type": [
              "integer",
              "null"
            ],
            "description": "Probability from PROB30 / PROB40 groups."
          },
          "wdir": {
            "type": [
              "integer",
              "string",
              "null"
            ],
            "description": "Wind direction in degrees or VRB."
          },
          "wspd": {
            "type": [
              "integer",
              "null"
            ],
            "description": "Wind speed (knots)."
          },
          "wgst": {
            "type": [
              "integer",
              "null"
            ],
            "description": "Wind gust (knots)."
          },
          "wshearHgt": {
            "type": [
              "integer",
              "null"
            ],
            "description": "Wind shear top in feet."
          },
          "wshearDir": {
            "type": [
              "integer",
              "null"
            ],
            "description": "Wind direction at top of shear layer."
          },
          "wshearSpd": {
            "type": [
              "integer",
              "null"
            ],
            "description": "Wind speed at top of shear layer (knots)."
          },
          "visib": {
            "type": [
              "number",
              "string",
              "null"
            ],
            "description": "Visibility (SM); 6+ for >6 SM."
          },
          "altim": {
            "type": [
              "number",
              "null"
            ],
            "description": "Altimeter setting (hPa)."
          },
          "vertVis": {
            "type": [
              "integer",
              "null"
            ],
            "description": "Vertical visibility (feet)."
          },
          "wxString": {
            "type": [
              "string",
              "null"
            ],
            "description": "Encoded present weather."
          },
          "notDecoded": {
            "type": [
              "string",
              "null"
            ],
            "description": "Text that could not be decoded."
          },
          "clouds": {
            "type": "array",
            "items": {
              "type": "object"
            }
          },
          "icgTurb": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "var": {
                  "type": "string",
                  "enum": [
                    "ICE",
                    "TURB"
                  ]
                },
                "intensity": {
                  "type": "int32"
                },
                "minAlt": {
                  "type": "int32",
                  "description": "Minimum altitude (feet)."
                },
                "maxAlt": {
                  "type": "int32",
                  "description": "Maximum altitude (feet)."
                }
              }
            }
          },
          "temp": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "validTime": {
                  "type": "int32",
                  "description": "Time of max/min (UNIX epoch)."
                },
                "sfcTemp": {
                  "type": "int32",
                  "description": "Surface temperature (C)."
                },
                "maxOrMin": {
                  "type": "string",
                  "enum": [
                    "MAX",
                    "MIN"
                  ]
                }
              }
            }
          }
        }
      }
    }
  }
}