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meteorological information for operational purposes, the quality
system should include verzfication and validation
procedures and resources for monitoring adherence to the
prescribed transmission schedules for individual messages
andor bulletins required to be exchanged, and the times of
their filing for transmission. The quality system should be
capable of detecting excessive transit times of messages and
bulletins received.
Note.- Requirements concerning the exchange of
operational meteorological information are given in
Chapter I I and Appendix I0 of this Annex.
a) of flight schedules;
b) when non-scheduled flights are to be operated; and
c) when flights are delayed, advanced or cancelled.
2.3.4 Recommendation.- The notification to the
aerodrome meteorological office, or the meteorological office
concerned, of individual flights should contain the following
information except that, in the case of scheduled flights, the
requirement for some or all of this information may be waived
by agreement between the meteorological office and the
operator:
Chapter 2 Annex 3 - Meteorological Service for International Air Navigation
a) aerodrome of departure and estimated time of departure;
b) destination and estimated time of arrival;
c) route to be flown and estimated times of arrival at, and
departure *om, any intermediate aerodrome(s);
d) alternate aerodromes needed to complete the operational
flight plan and taken from the relevant list contained in
the regional air navigation plan;
e) cruising level;
fl for supersonic flights, the alternative subsonic cruising
level and the locations of the transonic acceleration and
deceleration areas and of the subsonic climb and
descent paths;
e) type ofjlight, whether under the visual or the instrument
flight rules;
h) type of meteorological information requested for aflight
crew member; whether jlight documentation andor
briefing or consultation; and
i) time(s) at which briefing, consultation andor flight
documentation are required.
CHAPTER 3. WORLD AREA FORECAST SYSTEM
AND METEOROLOGICAL OFFICES
Note.- Technical specifications and detailed criteria f ) to establish and maintain contact with VAACs for the
related to this chapter are given in Appendix 2. exchange of information on volcanic activity in order to
coordinate the inclusion of information on volcanic
eruptions in significant weather forecasts.
3.1 Objective of the
world area forecast system
The objective of the world area forecast system shall be to
supply meteorological authorities and other users with
forecasts of global upper wind, upper-air temperature and
humidity, direction, speed and height of maximum wind,
tropopause height and temperature and forecasts of significant
weather phenomena in digital form. This objective shall be
achieved through a comprehensive, integrated, worldwide and,
as far as practicable, uniform system, and in a cost-effective
manner, taking full advantage of evolving technologies.
3.2 World area forecast centres
3.2.1 A Contracting State, having accepted the responsibility
for providing a WAFC within the framework of the
world area forecast system, shall arrange for that centre:
a) to prepare global forecasts for grid points in digital form
for all required levels and in a standard format; the forecasts
shall comprise upper winds, upper-air temperatures
and humidity, tropopause heights and temperatures and
maximum wind speed, direction and height;
b) to prepare global forecasts of significant weather
phenomena in digital form;
c) to issue the forecasts referred to in a) and b) in digital
fom to meteorological authorities and other users in its
service area, as approved by the Contracting State on
advice from the meteorological authority;
d) to prepare and issue amendments to the forecasts;
e) to receive information concerning the accidental release
of radioactive materials into the atmosphere from its
associated WMO regional specialized meteorological
centre for the provision of transport model products for
radiological environmental emergency response, in
order to include the information in significant weather
forecasts; and
Note I.--. Specifications for the preparation of significant
weather and upper-air prognostic charts are contained in
Part If, Appendix I .
Note 2.- The WAFS service areas am given in the regional
air navigation plans.
3.2.2 In case of interruption of the operation of a WAFC,
its functions shall be carried out by the other WAFC.
Note.- Back-up procedures to be used in case of intemption
　
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