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b) forecasts of upper winds, upper-air temperatures and
significant en-route weather phenomena and amendments
thereto, particularly those which are Iikely to
make operation under visual flight rules impracticable,
SIGMET and AIRMET information and appropriate
special air-reports for the flight information region or
control area and, if determined by regional air navigation
agreement and required by the flight information
centre or area control centre, for neighbouring flight
information regions;
c) any other meteorological information required by the
flight information centre or area control centre to meet
requests from aircraft in flight; if the information
requested is not available in the associated meteorological
watch office, that office shall request the assistance
of another meteorological office in supplying it;
d) information received on volcanic ash cloud, for which a
SIGMET has not already been issued, as agreed between
the meteorological and ATS authorities concerned; and
e) information received concerning the accidental release
of radioactive materials into the atmosphere, as agreed
between the meteorological and ATS authorities
concerned.
ANNEX 3 APP 9-1 2511 1104
Annex 3 - Meteorological Service for International Air Navigation Appendix 9
1.4 Specific provisions related to
the supply of information
on volcanic ash and volcanic eruptions
2. INFORMATION TO BE PROVIDED
FOR SEARCH AND RESCUE SERVICES UNITS
1'.4.1 Volcanic ash advisory information issued by a 2.1 List of information
VAAC shall be supplied to area control centres and flight
information centres concerned in its area of responsibility. Information to be supplied to rescue coordination centres shall
include the meteorological conditions that existed in the last
1.4.2 Information received on pre-eruption volcanic known position of a missing aircraft and along the intended
activity andlor a volcanic eruption shall be supplied, as necess- route of that aircraft with particular reference to:
ary, to an ATS unit by its corresponding associated
meteorological ofice as agreed between the meteorological a) significant en-route weather phenomena;
and ATS authorities concerned.
b) cloud amount and type, particularly cumulonimbus;
height indications of bases and tops;
1.5 Specific provisions related to
the supply of information for
supersonic aircraft
c) visibility and phenomena reducing visibility;
d) surface wind and upper wind;
Recommendation.- The information supplied to flight
information centres and area control centres for supersonic e) state of ground, in particular, any snow cover or
aircraft should cover the levels used for transonic and super- flooding;
sonic flight and should include forecasts for subsonic descent
paths to aerodromes in the flight information region. f) sea-surface temperature, state of the sea, ice cover if any
and ocean currents, if relevant to the search area; and
g) sea-level pressure data.
1.6 Supply of information to aeronautical
telecommunications stations
Where necessary for flight information purposes, current 2.2 Information to be provided on request
meteorological reports and forecasts shall be supplied to designated
aeronautical telecommunication stations. A copy of 2.2.1 Recornmendation.- On request from the rescue
such information shall be forwarded, if required, to the flight coordination centre, the designated meteorological office
information centre or the area control centre. should arrange to obtain details of the flight documentation
which was supplied to the missing aircraji, together with any
amendments to the forecast which were transmitted to the
aircraji in flight.
1.7 Format of information
1.7.1 Recommendation.- Local routine and special
reports, METAR and SPECI, TAF and trend forecasts,
SIGMET and AIRMET information, upper wind and upper-air
temperature forecasts and amendments thereto should be supplied
to air traffic services units in the form in which they are
prepared, dkseminated to other meteorological offices or
received from other meteorological offices, unless otherwise
agreed locally.
1.7.2 ~ecommendation.- When computer-processed
upper-air data for grid points are made available to air traffic
services units in digital form for use by air traffic services
computers, the contents, format and transmission arrangements
should be as agreed between the meteorological
authority and the appropriate ATS authority. The data should
normally be supplied as soon as is practicable ajier the
processing of the forecasts has been completed.
2.2.2 Recommendation.- To facilitate search and
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