A Record containing meteorological trend forecasting conditions at an aerodrome.  This class is the result of MeteorologicalAerodromeTrendForecast observations.  This class is also related but not identical to MeteorologicalAerodromeForecastRecord which is reported on a TAF - conditions reported in trend forecasts in METAR/SPECI differ from forecast groups in a TAF.<br /></p><p><br /></p><p>When no clouds of operational significance or no weather of operational significance is predicted, the NothingOfOperationalSignificance nilReason should be used for the cloud or presentWeather association.  When no clouds were detected by the automatic observing system, the NotDetectedByAutoSystem nilReason should be used for the cloud association.<br /></p>