AerodromeSurfaceWindForecast
AerodromeSurfaceWindForecast
A forecast of wind conditions at an aerodrome. Wind direction shall be given in degrees from true North. Plane angle unit of measure (uom) is deg". A true north wind is indicated with a direction of 360. Calm wind is indicated with a direction of 0. Wind speeds and gusts, if present, shall be provided in either two units of measures: "m/s" or "[kn_i]" (knot). This extends AerodromeSurfaceWindTrendForecast to allow for a variable wind direction to be reported. This class differs from a aerodrome wind observation in that the observations may include a min/max directional variability. This class only carries a true/false indication that it will be variable. "
| Properties | Definition | Type |
|---|---|---|
| variableWindDirection | Indicates variable wind direction. Cannot be reported with a mean wind direction | Boolean |
Details
AerodromeSurfaceWindForecast
AerodromeSurfaceWindForecast
A forecast of wind conditions at an aerodrome. Wind direction shall be given in degrees from true North. Plane angle unit of measure (uom) is deg". A true north wind is indicated with a direction of 360. Calm wind is indicated with a direction of 0. Wind speeds and gusts, if present, shall be provided in either two units of measures: "m/s" or "[kn_i]" (knot). This extends AerodromeSurfaceWindTrendForecast to allow for a variable wind direction to be reported. This class differs from a aerodrome wind observation in that the observations may include a min/max directional variability. This class only carries a true/false indication that it will be variable. "
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| WeatherCondition | Weather observations or forecast for an area of interest. |
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Air motion relative to the Earth's surface. Unless otherwise specified, only the horizontal component is considered. |
variableWindDirection
AerodromeSurfaceWindForecast.variableWindDirection
Indicates variable wind direction. Cannot be reported with a mean wind direction
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| Wind.isVariable | Indication that the direction of the wind changes frequently. According to Annex 3 the wind is reported as variable (VRB) in local routine or special reports, in METAR and SPECI, when one of the following situations occur: - when the total variation is 60 or more and less than 180 and the wind speed is less than 1.5 m/s (3 kt), the wind direction shall be reported as variable with no mean wind direction; or - when the total variation is 180 or more, the wind direction shall be reported as variable with no mean wind direction. |