{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://api.met.no/weatherapi/schemas/forecast",
  "title": "MET Norway Forecast Response Schema",
  "description": "Schema for the GeoJSON-based forecast timeseries returned by the MET Norway locationforecast and nowcast APIs.",
  "type": "object",
  "required": ["type", "geometry", "properties"],
  "properties": {
    "type": {
      "type": "string",
      "const": "Feature",
      "description": "GeoJSON feature type identifier"
    },
    "geometry": {
      "$ref": "#/definitions/PointGeometry"
    },
    "properties": {
      "$ref": "#/definitions/Forecast"
    }
  },
  "definitions": {
    "PointGeometry": {
      "title": "GeoJSON Point Geometry",
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": {
          "type": "string",
          "const": "Point"
        },
        "coordinates": {
          "type": "array",
          "description": "[longitude, latitude] or [longitude, latitude, altitude]",
          "minItems": 2,
          "maxItems": 3,
          "items": {
            "type": "number"
          },
          "examples": [
            [9.58, 60.10],
            [9.58, 60.10, 200]
          ]
        }
      }
    },
    "Forecast": {
      "title": "Forecast Timeseries Container",
      "type": "object",
      "required": ["meta", "timeseries"],
      "properties": {
        "meta": {
          "type": "object",
          "required": ["updated_at", "units"],
          "properties": {
            "updated_at": {
              "type": "string",
              "format": "date-time",
              "description": "ISO 8601 timestamp of the last forecast update",
              "examples": ["2024-01-15T06:00:00Z"]
            },
            "units": {
              "$ref": "#/definitions/ForecastUnits"
            },
            "radar_coverage": {
              "$ref": "#/definitions/RadarCoverage"
            }
          }
        },
        "timeseries": {
          "type": "array",
          "description": "Ordered array of forecast time steps",
          "items": {
            "$ref": "#/definitions/ForecastTimeStep"
          }
        }
      }
    },
    "ForecastTimeStep": {
      "title": "Forecast Time Step",
      "type": "object",
      "required": ["time", "data"],
      "properties": {
        "time": {
          "type": "string",
          "format": "date-time",
          "description": "ISO 8601 timestamp for which this forecast step is valid",
          "examples": ["2024-01-15T07:00:00Z"]
        },
        "data": {
          "type": "object",
          "description": "Forecast values for this time step",
          "properties": {
            "instant": {
              "type": "object",
              "description": "Parameters valid at this exact instant",
              "properties": {
                "details": {
                  "$ref": "#/definitions/ForecastData"
                }
              }
            },
            "next_1_hours": {
              "$ref": "#/definitions/ForecastPeriod"
            },
            "next_6_hours": {
              "$ref": "#/definitions/ForecastPeriod"
            },
            "next_12_hours": {
              "$ref": "#/definitions/ForecastPeriod"
            }
          }
        }
      }
    },
    "ForecastPeriod": {
      "type": "object",
      "description": "Aggregate forecast values and summary for a time period",
      "properties": {
        "summary": {
          "$ref": "#/definitions/ForecastSummary"
        },
        "details": {
          "$ref": "#/definitions/ForecastData"
        }
      }
    },
    "ForecastSummary": {
      "type": "object",
      "required": ["symbol_code"],
      "description": "Summary of weather conditions for a forecast period",
      "properties": {
        "symbol_code": {
          "$ref": "#/definitions/WeatherSymbol"
        },
        "symbol_confidence": {
          "$ref": "#/definitions/SymbolConfidence"
        }
      }
    },
    "ForecastData": {
      "type": "object",
      "description": "Map of weather parameter names to their numeric values",
      "additionalProperties": {
        "type": "number"
      },
      "examples": [
        {
          "air_temperature": 2.5,
          "wind_speed": 4.2,
          "wind_from_direction": 180.0,
          "relative_humidity": 85.0,
          "cloud_area_fraction": 60.0,
          "precipitation_amount": 0.2,
          "ultraviolet_index_clear_sky": 0.5
        }
      ]
    },
    "ForecastUnits": {
      "type": "object",
      "description": "Map of parameter names to their unit strings",
      "additionalProperties": {
        "type": "string"
      },
      "examples": [
        {
          "air_temperature": "celsius",
          "wind_speed": "m/s",
          "wind_from_direction": "degrees",
          "precipitation_amount": "mm",
          "relative_humidity": "%",
          "cloud_area_fraction": "%",
          "ultraviolet_index_clear_sky": "1"
        }
      ]
    },
    "WeatherSymbol": {
      "type": "string",
      "description": "Identifier summarizing weather conditions for a time period",
      "enum": [
        "clearsky_day", "clearsky_night", "clearsky_polartwilight",
        "fair_day", "fair_night", "fair_polartwilight",
        "partlycloudy_day", "partlycloudy_night", "partlycloudy_polartwilight",
        "cloudy", "fog",
        "lightrain", "rain", "heavyrain",
        "lightrainandthunder", "rainandthunder", "heavyrainandthunder",
        "lightsnow", "snow", "heavysnow",
        "lightsnowandthunder", "snowandthunder", "heavysnowandthunder",
        "lightsleet", "sleet", "heavysleet",
        "lightsleetandthunder", "sleetandthunder", "heavysleetandthunder",
        "lightrainshowers_day", "lightrainshowers_night", "lightrainshowers_polartwilight",
        "rainshowers_day", "rainshowers_night", "rainshowers_polartwilight",
        "heavyrainshowers_day", "heavyrainshowers_night", "heavyrainshowers_polartwilight",
        "lightrainshowersandthunder_day", "lightrainshowersandthunder_night", "lightrainshowersandthunder_polartwilight",
        "rainshowersandthunder_day", "rainshowersandthunder_night", "rainshowersandthunder_polartwilight",
        "heavyrainshowersandthunder_day", "heavyrainshowersandthunder_night", "heavyrainshowersandthunder_polartwilight",
        "lightsnowshowers_day", "lightsnowshowers_night", "lightsnowshowers_polartwilight",
        "snowshowers_day", "snowshowers_night", "snowshowers_polartwilight",
        "heavysnowshowers_day", "heavysnowshowers_night", "heavysnowshowers_polartwilight",
        "lightssnowshowersandthunder_day", "lightssnowshowersandthunder_night", "lightssnowshowersandthunder_polartwilight",
        "snowshowersandthunder_day", "snowshowersandthunder_night", "snowshowersandthunder_polartwilight",
        "heavysnowshowersandthunder_day", "heavysnowshowersandthunder_night", "heavysnowshowersandthunder_polartwilight",
        "lightsleetshowers_day", "lightsleetshowers_night", "lightsleetshowers_polartwilight",
        "sleetshowers_day", "sleetshowers_night", "sleetshowers_polartwilight",
        "heavysleetshowers_day", "heavysleetshowers_night", "heavysleetshowers_polartwilight",
        "lightssleetshowersandthunder_day", "lightssleetshowersandthunder_night", "lightssleetshowersandthunder_polartwilight",
        "sleetshowersandthunder_day", "sleetshowersandthunder_night", "sleetshowersandthunder_polartwilight",
        "heavysleetshowersandthunder_day", "heavysleetshowersandthunder_night", "heavysleetshowersandthunder_polartwilight"
      ]
    },
    "SymbolConfidence": {
      "type": "string",
      "description": "Certainty estimate for a weather symbol",
      "enum": ["certain", "somewhat certain", "uncertain"]
    },
    "RadarCoverage": {
      "type": "string",
      "description": "Radar coverage status for the requested location",
      "enum": ["ok", "temporarily unavailable", "no coverage"]
    }
  }
}