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within the 3 hours before the expected time of departure.
6.4.4 Recommendation.- Meteorological offices preparing
forecasts for take-off should keep the forecasts under
continuous review and, when necessary. should issue
amendments promptly.
6.5 Area and route forecasts, other than forecasts
issued within the framework of the
world area forecast system
Note.- Provisions concerning forecasts issued within the
framework of the world area forecast system are contained in
Chapter 3 and Appendix 2 and those concerning area forecasts
for low-levelflights, under Section 6.6 and Appendix 5.
6.5.1 Area and route forecasts shall contain upper winds,
upper-air temperatures, significant en-route weather phenomena
and associated clouds. Other elements may be added as
required. This information shall cover the flight operations for
which they are intended in respect of time, altitude and
geographical extent.
6.5.2 Meteorological offices preparing area and route
forecasts shall keep the forecasts under continuous review and
issue amendments as necessary.
6.6 Area forecasts for low-level flights
6.6.1 When the density of traffic operating below flight
level 100 (or up to flight level 150 in mountainous areas, or
higher, where necessary) warrants the routine issue and dissemination
of area forecasts for such operations, the frequency
of issue, the form and the fixed time or period of validity of
those forecasts and the criteria of amendments thereto shall be
determined by the meteorological authority in consultation
with the users.
6.6.2 When the density of traffic operating below flight
level 100 warrants the issuance of AIRMET information in
accordance with 7.2.1, area forecasts for such operations shall
be prepared in a format agreed upon between the meteorological
authorities concerned. When abbreviated plain language is
used, the forecast shall be prepared as a GAMET area forecast,
employing approved ICAO abbreviations and numerical
values. 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, in support of the issuance of
AIRMET information, and additional information required by
low-level flights.
6.6.3 Area forecasts for low-level flights prepared in
support of the issuance of AIRMET information shall be
issued every 6 hours for a period of validity of 6 hours and
transmitted to meteorological offices concerned not later than
one hour prior to the beginning of their validity period.
CHAPTER 7. SIGMET AND AIRMET INFORMATION,
AERODROME WARNINGS AND WIND SHEAR WARNINGS
Note.- Technical specifications and detailed criteria
related to this chapter are given in Appendix 6.
7.1 SIGMET information
7.1.1 SIGMET information shall be issued by a meteorological
watch office and shall give a concise description in
abbreviated plain language concerning the occurrence and/or
expected occurrence of specified en-route weather phenomena,
which may affect the safety of aircraft operations, and of the
development of those phenomena in time and space.
7.1.2 SIGMET information shall be cancelled when the
phenomena are no longer occurring or are no longer expected
to occur in the area.
7.1.3 The period of validity of a SIGMET message shall
be not more than 6 hours, and preferably not more than
4 hours.
7.1.4 Recommendation.- In the special case of
SZGMET messages for volcanic ash cloud and tropical
cyclones, an outlook should be included giving information for
up to 12 hours beyond the period of validity specified in 7.1.3,
concerning the trajectory of the volcanic ash cloud and positions
of the tropical cyclone centre.
7.1.5 Recommendation.- SZGMET messages issued in
accordance with 7.1.4, concerning volcanic ash cloud and
tropical cyclones should be based on advisory information
provided by VAACs and TCACs respectively, designated by
regional air navigation agreement.
7.1.6 Close coordination shall be maintained between the
meteorological watch office and the associated area control
centrelflight information centre to ensure that information on
volcanic ash included in SIGMET and NOTAM messages is
consistent.
7.1.7 A SIGMET message relating to the expected
occurrence of weather phenomena listed in Appendix 6, 1.1.4,
with the exception of volcanic ash cloud and tropical cyclones,
shall be issued not more than 6 hours, and preferably not more
than 4 hours, before the expected time of occurrence of that
　
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