The forecast change indicator type, including temporary, permanent, or probable conditions.  This is an extension of ForecastChangeIndicator that includes report-specific entries, and in particular the 30 and 40% probability conditions.<br /></p><p><br /></p><p>Note that the TAC representations for "FM", "TL", and "AT" are represented by the phenomenonTime on the change forecast (MeteorologicalAerodromeForecast):<br /></p><p>    FM and TL - a phenomenonTime with a TimePeriod (start is FM and end is TL)<br /></p><p>    TL - a phenomenonTime with a TimePeriod (start is beginning of forecast validity and end is TL)<br /></p><p>    FM - a phenomenonTime with a TimePeriod (start is FM and end is end of forecast validity)<br /></p><p>    AT - a phenomenonTime with a TimeInstant<br /></p><p><br /></p><p>Design note:<br /></p><p>These values represent the operationally-representable types, but are not very general-purpose.  Especially with temporary conditions and probability it might be better to turn these into a "probability" property and constraints could be applied to the value to match operational constraints<br /></p>