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