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phenomenon.
7.1.8 Recommendation.- SZGMET messages concerning
volcanic ash cloud or tropical cyclones expected to affect
a jlight information region should be issued up to 12 hours
before the commencement of the period of validity or as soon
as practicable if such advance warning of the existence of
these phenomena is not available. SZGMET messages for
volcanic ash and tropical cyclones should be updated at least
every 6 hours.
7.2 AIRMET information
7.2.1 AIRMET information shall be issued bv a meteorological
watch office in accordance with regional air navigation
agreement, taking into account the density of air traffic
operating below flight level 100. AIRMET information shall
give a concise description in abbreviated plain language
concerning the occurrence and/or expected occurrence of
specified en-route weather phenomena, which have not been
included in Section I of the area forecast for low-level flights
issued in accordance with Chapter 6, Section 6.6 and which
may affect the safety of low-level flights, and of the development
of those phenomena in time and space.
7.2.2 AIRMET information shall be cancelled when the
phenomena are no longer occurring or are no longer expected
to occur in the area.
7.2.3 The period of validity of an AIRMET message shall
be not more than 6 hours, and preferably not more than
4 hours.
7.3 Aerodrome warnings
7.3.1 Aerodrome warnings shall be issued by the
meteorological office designated by the meteorological
authority concerned and shall give concise information of
meteorological conditions which could adversely affect
aircraft on the ground, including parked aircraft, and the
aerodrome facilities and services.
7.3.2 Recommendation.- Aerodrome warnings should
be cancelled when the conditions are no longer occurring andl
or no longer expected to occur at the aerodrome.
ANNEX 3 7-1 25/11/04
Annex 3 - Meteorological Service for International Air Navigation Chapter 7
7.4 Wind shear warnings
7.4.1 Wind shear warnings shall be prepared by the
meteorological office designated by the meteorological authority
concerned and shall give concise information of the
observed or expected existence of wind shear which could
adversely affect aircraft on the approach path or take-off path
or during circling approach between runway level and 500 m
(1 600 ft) above that level and aircraft on the runway during
the landing roll or take-off run. Where local topography has
been shown to produce significant wind shears at heights in
excess of 500 m (1 600 ft) above runway level, then 500 m
(1 600 ft) shall not be considered restrictive.
Note.- Guidance on the subject of wind shear is contained
in the Manual on Wind Shear (Doc 981 7, in preparation).
7.4.2 Recommendation.- Wind shear warnings for
arriving aircrafi andlor departing aircrafi should be cancelled
when aircraft reports indicate that wind shear no longer
exists, or alternatively, ajer an agreed elapsed time. The
criteria for the cancellation of a wind shear warning should
be defined locally for each aerodrome, as agreed between the
meteorological authority, the appropriate ATS authority and
the operators concerned.
CHAPTER 8. AERONAUTICAL CLIMATOLOGICAL
INFORMATION
Note.- Technical specifications and detailed criteria
related to this chapter are given in Appendix 7.
8.1 General provisions
Note.- In cases where it is impracticable to meet the
requirements for aeronautical climatological information on a
national basis, the collection, processing and storage of observational
data may be effected through computer facilities
available for international use, and the responsibility for the
preparation of the required aeronautical climatological information
may be delegated by agreement between the
meteorological authorities concerned.
8.1.1 Aeronautical climatological information required
for the planning of flight operations shall be prepared in the
form of aerodrome climatological tables and aerodrome climatological
summaries. Such information shall be supplied to
aeronautical users as agreed between the meteorological
authority and those users.
Note.- Climatological data required for aerodrome
planningpurposes are set out in Annex 14. Volume 1, 3.1.3 and
in Attachment A.
8.1.2 Recommendation.- Aeronautical climatological
information should normally be based on observations made
over a period of at least five years and the period should be
indicated in the information supplied.
8.1.3 Recommendation.- Climatological data related
to sites for new aerodromes and to additional runways at
　
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