MET.TR.260
Area forecasts for low-level flights
Regulation
(EU) 2021/1338
(a) When chart form is used for area forecasts
for low-level flights, the forecast of upper wind and upper-air temperature
shall be issued for points separated by no more than 300 NM and for, as a
minimum, the following altitudes: 2 000, 5 000 and 10 000 ft
(600, 1 500 and 3 000 m) and 15 000 ft
(4 500 m) in mountainous areas. The issuance of forecasts of upper
wind and upper-air temperature at an altitude of 2 000 ft (600 m) may be subject to local
orographic considerations as determined by the competent authority.
(b) When chart form is used for area forecasts
for low-level flights, the forecast of SIGWX phenomena shall be issued as
low-level SIGWX forecast for flight levels up to 100, or up to flight level
150 in mountainous areas, or higher, where necessary. Low-level SIGWX
forecasts shall include:
(1) the following phenomena warranting the
issuance of a SIGMET: severe icing, severe turbulence, cumulonimbus clouds and
thunderstorms that are obscured, frequent, embedded or occurring at a squall
line, sandstorms/dust storms and volcanic eruptions or a release of
radioactive materials into the atmosphere, and which are expected to affect
low-level flights;
(2) the following elements in area forecasts
for low-level flights: surface wind, surface visibility, significant weather
phenomena, mountain obscuration, cloud, icing, turbulence, mountain wave and
height of zero-degree isotherm.
(c) When the competent authority has
determined that the density of traffic operating below flight level 100, or up
to flight level 150 in mountainous areas, or higher, where necessary, warrants
the issuance of an AIRMET in combination with area forecasts for low-level
flights, the area forecasts shall be issued to cover the layer between the
ground and flight level 100, or up to flight level 150 in mountainous areas,
or higher, where necessary, and shall contain information on en-route weather
phenomena hazardous to low-level flights.
EASA aviation regulations mandate specific area forecasts for low-level flights, including upper wind/temperature at defined altitudes and significant weather (SIGWX) phenomena like icing, turbulence, and thunderstorms. Forecasts cover up to flight level 100 (150 in mountainous regions), potentially including AIRMET information for hazardous en-route weather.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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