Class MeteorologicalAerodromeTrendForecast (a subclass of WMO::ComplexSamplingMeasurement) is intended for use where the observation event is concerned with the evaluation of multiple forecast measurands at a specified Aerodrome. The result of this observation type shall refer to an entity of type MeteorologicalAerodromeTrendForecastRecord.<br /></p><p><br /></p><p>MeteorologicalAerodromeTrendForecast additionally enforces that the sampled feature must be an Aerodrome<br /></p><p><br /></p><p>MeteorologicalAerodromeTrendForecasts are reported in surface observation reports such as SPECI and METAR. MeteorologicalAerodromeTrendForecast has a sister class for trend forecast information at an Aerodrome (MeteorologicalAerodromeObservation) which is also reported on a METAR and SPECI for observed phenomena.  This class is also related but not identical to MeteorologicalAerodromeForecast which is reported on a TAF - conditions reported in trend forecasts in METAR/SPECI differ from forecast groups in a TAF.<br /></p>