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aerodrome serves as given in Table AOP of the relevant
a) METAR and SPECI;
regional air navigation plan;
b) TAF and trend forecasts; e) a geographical grid should be shown with meridians
and .parallels represented by dotted lines at each 10"
c) aerodrome warnings relating to the local aerodrome; latitude and longitude; dots should be spaced one
degree apart;
d) forecasts for take-off;
j.l latitude and longitude values should be indicated at
e) SIGMET and AIRMET information and special air- various points throughout the charts (i.e. not only at the
reports not covered by a SIGMET; edges); and
f ) current and prognostic charts; g) labels on the charts forflight documentation should be
clear and simple and should present the name of the
g) meteorological satellite images or mosaics andlor world area forecast centre ol; for non- WAFS products,
nephanalyses; and the originating centre, the type of chart, date and valid
time and, if necessary, the types of units used in an
h) ground-based weather radar information. unambiguous way.
2511 1/04 APP 8-2
Appendix 8 Annex 3 - Meteorological Service for International Air Navigation
4.1.1.2 Recommendation.- Meteorological information
included in flight documentation should be represented as
follows:
a) winds on charts should be depicted by amws with
feathers and shaded pennants on a suflciently dense
grid;
b) temperatures should be depicted by figures on a
suflciently dense grid;
c) wind and temperature data selected from the data sets
received from a world area forecast centre should be
depicted in a suflciently dense latitude/longitude grid;
and
d) wind arrows should take precedence over temperatures
and either should take precedence over chart
background.
4.1.1.3 Recommendation.- For short-haul flights
charts should be prepared covering limited areas at a scale of
1:15 x lo6 as required and subject to regional air navigation
agreement.
4.1.2 Set of charts to be provided
4.1.2.1 Recommendation.- The minimum number of
charts forflights between flight level 250 andflight level 630
should include a high-level significant weather chart flight
level 250 toflight level 630) and a forecast 250 hPa wind and
temperature chart. The actual charts provided for pre-flight
and in-flight planning and forflight documentation should be
as agreed between meteorological authorities and other users
within a service area.
4.1.2.2 Recommendation.- The set of charts to be
provided under the world area forecast system for flights
belowflight level 250 should be as agreed between user States
and other users.
4.2 Specifications related to upper wind
and upper-air temperature information
4.2.1 In chart form
4.2.1.1 Where upper wind and upper-air temperature
information is supplied in chart form to flight crew members
before departure, the charts shall be fixed time prognostic
charts for standard flight levels. In tropical areas, or for short
flights, current charts may be provided in lieu of prognostic
charts; in such cases, the levels depicted shall correspond to
the standard isobaric levels.
4.2.1.2 Upp$ wind and upper-air tempera'ture charts for
low-level flights shall be supplied for points separated by no
more than 500 km (300 NM) and for at least the following
altitudes: 600, 1 500 and 3 000 m (2 000, 5 000 and 10 000 ft).
4.2.2 In tabular form
Recommendation.- Where upper wind and upper-air
temperature info~ationis supplied in tabular form, it should
include data for the sameflight levels as for upper-air charts.
This information. should be given for spot locations on a
regular grid.
Note.- Examples of the form of presentation of tabular
forecasts of upper win& and upper-air temperatures are given
in Appendix I.
4.3 Specifications related to significant
weather information
: 4.3.1 In chart form
4.3.1.1 Whefe information on significant en-route
weather phenomha is supplied in chart form to flight crew
members before . departure, the charts shall be significant
weather charts valid for a specified fixed time. Such charts
shall show, as appropriate to the flight:
4.1.3 Height indications
a) thunderstorms;
Recommendation.- In flight documentation height indications
should be given as follows:
a) all references to en-route meteorological conditions,
such as height indications of upper winds, turbulence or
bases and tops of clouds, should preferably be expressed
in flight levels; they may also be expressed in pressure,
altitude or, for low-level flights, height above ground
level; and
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