AMC1 MET.TR.260 Area forecasts for low-level flights

• ED Decision 2022/004/R found in: ATM/ANS Provision of Services (2017/373) (Mar 2025)

AMC1 MET.TR.260 Area forecasts for low-level flights ED Decision 2022/004/R AMENDMENT OF AREA FORECASTS FOR LOW-LEVEL FLIGHTS (a) In case that an area forecast for low-level flights is not issued in combination with AIRMET, the criteria for amendments to the area forecast for low-level flights should as a minimum include the weather phenomena hazardous to low-level flights, which would otherwise constitute the criteria for the issuance of AIRMET. (b) When low-level forecast is issued as a SIGWX chart or as a wind and temperature (W+T) chart, it should, as appropriate, include the cloud/visibility information in the form of visibility/cloud base category which should be provided for well-defined sub-areas and/or route segments. For each sub-area and/or route segment, the reference height to which the cloud base information refers should be specified. (c) The graphical part of a SIGWX chart should depict the weather situation at the beginning of the validity period. Significant changes of initial weather parameters should be depicted together with time intervals determining the duration of expected changes. AMC1 MET.TR.260 Area forecasts for low-level flights ED Decision 2022/004/R AMENDMENT OF AREA FORECASTS FOR LOW-LEVEL FLIGHTS (a)       In case that an area forecast for low-level flights is not issued in combination with AIRMET, the criteria for amendments to the area forecast for low-level flights should as a minimum include the weather phenomena hazardous to low-level flights, which would otherwise constitute the criteria for the issuance of AIRMET. (b)       When low-level forecast is issued as a SIGWX chart or as a wind and temperature (W+T) chart, it should, as appropriate, include the cloud/visibility information in the form of visibility/cloud base category which should be provided for well-defined sub-areas and/or route segments. For each sub-area and/or route segment, the reference height to which the cloud base information refers should be specified. (c)       The graphical part of a SIGWX chart should depict the weather situation at the beginning of the validity period. Significant changes of initial weather parameters should be depicted together with time intervals determining the duration of expected changes.