Class MeteorologicalAerodromeForecast (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 MeteorologicalAerodromeForecastRecord.<br /></p><p><br /></p><p>MeteorologicalAerodromeForecast enforces the following additional constraints:<br /></p><p><ul><li>The sampled feature must be an Aerodrome</li><br /></p><p></ul><br /></p><p>This class is also related but not identical to MeteorologicalAerodromeTrendForecast which is reported on a METAR/SPECI - conditions reported in trend forecasts in METAR/SPECI differ from forecast groups in a TAF.<br /></p><p><br /></p><p>The TAF forecast group from/to variants (FM, TL, AT, etc.) are represented on the OM_Observation validTime, which is always an instance of TM_Period.  When there is only an instant at which a condition occurs, the start and end time are the same<br /></p>