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of the operation of a WAFC are given in Attachment C.
Back-up procedures are expected to be subject to minor
revisions by the World Area Forecast System Operations
Group (WAFSOPSG) and the latest revision can be found at
the WAFSOPSG website at: ww.icao.int/anb/wafsopsg.
3.3 Meteorological offices
3.3.1 Each Contracting State shall establish one or more
aerodrome and/or other meteorological offices which shall be
adequate for the provision of the meteorological service
required to satisfy the needs of international air navigation.
3.3.2 An aerodrome meteorological office shall carry out
all or some of the following functions as necessary to meet the
needs of flight operations at the aerodrome:
a) prepare and/or obtain forecasts and other relevant
information for flights with which it is concerned; the
extent of its responsibilities to prepare forecasts shall be
related to the local availability and use of en-route and
aerodrome forecast material received from other offices;
b) prepare andor obtain forecasts of local meteorological
conditions;
c) maintain a continuous survey of meteorological conditions
over the aerodromes for which it is designated to
prepare forecasts;
d) provide briefing, consultation and flight documentation
to flight crew members andlor other flight operations
personnel;
ANNEX 3 3-1 25/11/04
Annex 3 - Meteorological Service for International Air Navigation Chapter 3
e) supply other meteorological information to aeronautical
users;
f ) display the available meteorological information;
g) exchange meteorological information with other
meteorological offices; and
h) supply information received on pre-eruption volcanic
activity, a volcanic eruption or volcanic ash cloud, to its
associated air traffic services unit, aeronautical information
service unit and meteorological watch office as
a'gree'd between the meteorological, aeronautical
information service and ATS authorities concerned.
3.3;3 The aerodrome meteorological offices at which
flight documentation is required, as well as the areas to be
covered, shall be determined by regional air navigation
agreement.
3.3.4 The aerodromes for which landing forecasts are
required shall be determined by regional air navigation
agreement.
3.3.5 For aerodromes without meteorological offices:
a) the meteorological authority concerned shall designate
one or more meteorological offices to supply meteorological
information as required; and
b) the competent authofities shall establish means by
which such information can be supplied to the aerodromes
concerned.
. .
3.4 Meteorological watch ofices
3.4.1 A Contracting State, having accepted the
responsibility for providing air trafficservices within a flight
information region or a control area, shall establish one or
more meteorological watch offices, or arrange for another
Contracting State to do so.
3.4.2 A meteorological watch office shall:
a) maintain watch over meteorological conditions affecting
flight operations within its area of responsibility;
b) prepare SIGMET and other information relating to its
area of responsibility;
e) when required by regional air navigation agreement, in
accordance with 7.2.1:
1) prepare AIRMET information related to its area of
responsibility;
2) supply AIRMET information to associated air traffic
services units; and
3) disseminate AIRMET information;
f ) supply information received on pre-eruption volcanic
activity, a volcanic eruption and volcanic ash cloud for
which a SIGMET has not already been issued, to its
associated ACCRIC, as agreed between the meteorological
and ATS authorities concerned, and to its
associated VAAC as determined by regional air
navigation agreement; and
g) supply information received concerning the accidental
release of radioactive materials into the atmosphere, in
the area for whichit maintains watch or adjacent areas,
to its associated ACCRIC, as agreed between the
meteorological and ATS authorities concerned, and to
aeronautical information service units, as agreed
between 'the meteorological and appropriate civil
aviation authorities concerned. The information shall
comprise location, date and time of the accident, and
forecast trajectories of the radioactive materials.
Note.- The information is provided, at the request of the
delegated authority in a State, by WMO regional specialized
meteorological centres (RSMC) for the provision of transport
model products for radiological environmental emergency
response. The information is sent by the RSMC to a single
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