AerodromeForecastChangeIndicator
AerodromeForecastChangeIndicator
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. Note that the TAC representations for FM", "TL", and "AT" are represented by the phenomenonTime on the change forecast (MeteorologicalAerodromeForecast): FM and TL - a phenomenonTime with a TimePeriod (start is FM and end is TL) TL - a phenomenonTime with a TimePeriod (start is beginning of forecast validity and end is TL) FM - a phenomenonTime with a TimePeriod (start is FM and end is end of forecast validity) AT - a phenomenonTime with a TimeInstant"
| Properties | Definition | Type |
|---|---|---|
| BECOMING | Conditions are expected to reach or pass through specified threshold values at a regular or irregular rate and at an unspecified time during the time period. The time period should normally not exceed 2 hours but in any case should not exceed 4 hours. ICAO Annex 3 / WMO No. 49-2: BECMG" " | - |
| FROM | One set of prevailing weather conditions is expected to change significantly and more or less completely to a different set of conditions. Conditions in a FROM group supersede conditions in earlier groups. ICAO Annex 3 / WMO No. 49-2: FM"" | - |
| PROBABILITY_30 | A 30% probability of occurrence of an alternative value of a forecast element or elements. ICAO Annex 3 / WMO No. 49-2: PROB30"" | - |
| PROBABILITY_30_TEMPORARY_FLUCTUATIONS | A 30% probability of occurrence of temporary conditions of an alternative value of a forecast element or elements. ICAO Annex 3 / WMO No. 49-2: PROB30 TEMPO"" | - |
| PROBABILITY_40 | A 40% probability of occurrence of an alternative value of a forecast element or elements. ICAO Annex 3 / WMO No. 49-2: PROB40"" | - |
| PROBABILITY_40_TEMPORARY_FLUCTUATIONS | A 40% probability of occurrence of temporary conditions of an alternative value of a forecast element or elements. ICAO Annex 3 / WMO No. 49-2: PROB40 TEMPO"" | - |
| TEMPORARY_FLUCTUATIONS | Expected temporary fluctuations to meteorological conditions which reach or pass specified threshold criteria and last for a period of less than one hour in each instance and in the aggregate cover less than half of the forecast period during which the fluctuations are expected to occur. ICAO Annex 3 / WMO No. 49-2: TEMPO"" | - |
Details
AerodromeForecastChangeIndicator
AerodromeForecastChangeIndicator
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. Note that the TAC representations for FM", "TL", and "AT" are represented by the phenomenonTime on the change forecast (MeteorologicalAerodromeForecast): FM and TL - a phenomenonTime with a TimePeriod (start is FM and end is TL) TL - a phenomenonTime with a TimePeriod (start is beginning of forecast validity and end is TL) FM - a phenomenonTime with a TimePeriod (start is FM and end is end of forecast validity) AT - a phenomenonTime with a TimeInstant"
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| CodeChangeIndicatorType | A code describing the type of meteorological conditions changes. |
BECOMING
AerodromeForecastChangeIndicator.BECOMING
Conditions are expected to reach or pass through specified threshold values at a regular or irregular rate and at an unspecified time during the time period. The time period should normally not exceed 2 hours but in any case should not exceed 4 hours. ICAO Annex 3 / WMO No. 49-2: BECMG" "
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| CodeChangeIndicatorType.BECMG | A code used to describe changes where the meteorological conditions are expected to reach or pass through specified threshold values at a regular or irregular rate and at an unspecified time during the time period. |
FROM
AerodromeForecastChangeIndicator.FROM
One set of prevailing weather conditions is expected to change significantly and more or less completely to a different set of conditions. Conditions in a FROM group supersede conditions in earlier groups. ICAO Annex 3 / WMO No. 49-2: FM""
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| Change request | A change request is required on the AIRM. |
PROBABILITY_30
AerodromeForecastChangeIndicator.PROBABILITY_30
A 30% probability of occurrence of an alternative value of a forecast element or elements. ICAO Annex 3 / WMO No. 49-2: PROB30""
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| Change request | A change request is required on the AIRM. |
PROBABILITY_30_TEMPORARY_FLUCTUATIONS
AerodromeForecastChangeIndicator.PROBABILITY_30_TEMPORARY_FLUCTUATIONS
A 30% probability of occurrence of temporary conditions of an alternative value of a forecast element or elements. ICAO Annex 3 / WMO No. 49-2: PROB30 TEMPO""
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| Change request | A change request is required on the AIRM. |
PROBABILITY_40
AerodromeForecastChangeIndicator.PROBABILITY_40
A 40% probability of occurrence of an alternative value of a forecast element or elements. ICAO Annex 3 / WMO No. 49-2: PROB40""
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| Change request | A change request is required on the AIRM. |
PROBABILITY_40_TEMPORARY_FLUCTUATIONS
AerodromeForecastChangeIndicator.PROBABILITY_40_TEMPORARY_FLUCTUATIONS
A 40% probability of occurrence of temporary conditions of an alternative value of a forecast element or elements. ICAO Annex 3 / WMO No. 49-2: PROB40 TEMPO""
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| Change request | A change request is required on the AIRM. |
TEMPORARY_FLUCTUATIONS
AerodromeForecastChangeIndicator.TEMPORARY_FLUCTUATIONS
Expected temporary fluctuations to meteorological conditions which reach or pass specified threshold criteria and last for a period of less than one hour in each instance and in the aggregate cover less than half of the forecast period during which the fluctuations are expected to occur. ICAO Annex 3 / WMO No. 49-2: TEMPO""
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| CodeChangeIndicatorType.TEMPO | A code used to describe expected frequent or infrequent temporary fluctuations in the meteorological conditions which reach or pass specified threshold values and last for a period of less than one hour in each instance and, in the aggregate, cover less than one-half of the forecast period during which the fluctuations are expected to occur. |