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supplied; and
b) methods and means of supplying that information.
1.3 Recommendation.- On request by the operatol; the
meteorological information supplied forflight planning should
include data for the determination of the lowest usable flight
level.
Upper-air information supplied by WAFCs for pre-flight and
in-flight re-planning shall be in the CRIB code form.
Note.- The GRIB code form is contained in WMO Publication
No. 306, Manual on Codes, Volume 1.2, Part B -
Binary Codes.
2.2 Format of information
on significant weather
lnformation on significant weather supplied by WAFCs for
pre-flight and in-flight re-planning shall be in the BUFR code
form.
Note.- The BUFR code form is contained in WMO
Publication No. 306, Manual on Codes, Volume 1.2, Part B -
Binary Codes.
2.3 Specific needs of supersonic aircraft
Recommendation.- Meteorological information for
pre-flight planning and in-flight re-planning by operatorsfor
supersonic aircrafi should include data covering the levels
wed for transonic and supersonic flight, together with the
levels that may be used for subsonicflight. Particular mention
should be made of occurrence and expected occurrence,
location and vertical extent of cumulonimbus clouds,
turbulence and precipitation.
2.4 Specific needs of helicopter operations
Recommendation.- Meteoro[ogical information for
pre-flight planning and in-flight re-planning by operators of
helicopters flying to offshore structures should include data
covering the layersfrom sea level toflight level 100. Particular
mention should be made of the expected su$ace visibility,
the amount, type (where available), base and tops of cloud
ANNEX 3 APP 8-1 2511 1104
Annex 3 - Meteorological Service for International Air Navigation Appendix 8
belowflight level 100, sea state and sea surjhce temperature, 3.3.2 Recommendation.- The material displayed
mean sea-level pressure, and the occurrence and expected should be readily accessible to the flight crav members or
occurrence of turbulence and icing, as determined by regional other flight operations personnel concerned. By agreement
air navigation agreement. between the meteorological authority and the usel; the display
may be used in lieu of briefing and/or consultation.
3. SPECIFICATIONS RELATED TO
BRIEFING AND CONSULTATION
3.1 Specific needs of supersonic aircraft
Recommendation.- Briefing and/or consultation for
flight crew members of supersonic aircraji should include
meteorological information covering the flight levels of transonic
and supersonic flight. Particular mention should be
4. SPECIFICATIONS RELATED TO
FLIGHT DOCUMENTATION
4.1 General
4.1.1 Presentation of flight documentation
made of occurrence and-expected occurrence, location and
vertical extent of cumulonimbus cloudr, turbulence and 4.1 .l. 1 Recommendation.- Charts included in flight
precipitation. documentation should have a high standard of clarity and legibility
and should have the following physical characteristics:
3.2 Specific needs of low-level flights
Recommendation.- Briefing and/or consultation for
low-levelflights, including those in accordance with the visual
flight rules, should include meteorological information covering
altitudes up toflight level 100 (or up to flight level 150 in
mountainous areas or highel; where necessary). Particular
mention should be made of the occurrence or expected occurrence
of any phenomena causing widespread reduction of
visibility to less than 5 000 m, as well as the occurrence or
expected occurrence of clouds which may affect the flight.
a) for convenience, the largest size of charts should be
about 42 x 30 cm (standard size A3) and the smallest
size should be about 21 x 30 cm (standard size A#). The
choice between these sizes should depend on the route
lengths and the amount of detail that needs to be given
in the charts as agreed between meteorological
authorities and users;
b) major geographical features. such as coastlines, major
rivers and lakes should be depicted in a way that makes
them easily recognizable;
c) for charts prepared by computel; meteorological data
3.3 Information required to be displayed should take preference over basic chart information, the
former cancelling the latter wherever they overlap;
3.3.1 To assist the flight crew members and others
concerned with the preparation of the flight and for use in
briefing and consultation, the meteorological office shall d) major aerodromes should be shown as a dot and
display the latest available:
identified by the first letter of the name of the city the
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