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b) all references to aerodrome meteorological conditions,
such as height indications of the bases of clouds, should
be expressed in height above the aerodrome elevation.
b) tropical cyclone;
c) severe squall lines;
d) moderate or severe turbulence (in cloud or clear air);
e) moderate or severe icing;
f ) widespread sandstom-dduststorm;
g) for flight level 100 to flight level 250, clouds associated
with a) to f);
APP 8-3
Annex 3 - Meteorological Service for International Air Navigation Appendix 8
h) above flight level 250, cumulonimbus cloud associated
with a) to f);
i) surface position of well-defined convergence zones;
j) surface positions, speed and direction of movement of
frontal systems when associated with significant enroute
weather phenomena;
k) tropopause heights;
1) jetstreams;
m) information on the location of volcanic eruptions which
are producing ash clouds of significance to aircraft
operations, including those producing only steam, comprising:
volcanic eruption symbol at the location of the
volcano and, at the side of the chart, the volcano
eruption symbol, the name of the volcano, its international
number, latitudeilongitude, the date and time of
first eruption, if known, and a reference to SIGMETs
and NOTAM or ASHTAM issued for the area
concerned; and
n) information on the location of an accidental release of
radioactive materials into the atmosphere of significance
to aircraft operations, comprising: the radioactivity
symbol at the site of the accident and, at the side of the
chart, the radioactivity symbol, latitudeilongitude of the
site of the accident, date and time of the accident and a
reminder to users to check NOTAM for the area
concerned.
Note 1.- For aircraji operating above flight level 250,
items a) to j.l are only required if expected to be above that
level, and in the case of item a), only those thunderstorms
which warrant the issuance of a SIGMET as given in
Appendix 6. Guidance on the use of term "FRQ TS" is given
in Appendix 6.
Note 2.- The abbreviation "CB" should only be included
where it refers to the occurrence or expected occurrence of an
area of widespread cumulonimbus clouds or cumulonimbus
along a line with little or no space between individual cloudr,
or to cumulonimbus embedded in cloud layers or concealed by
haze. It does not refer to isolated or scattered cumulonimbus
not embedded in cloud layers or concealed by haze.
Note 3.- Where a volcanic eruption or the accidental
release of radioactive materials into the atmosphere warrants
the inclusion of the volcanic activity symbol or the radioactivity
symbol on significant weather charts, the symbols are to
be included on all such charts (low, medium and high) irrespective
of the height to which the ash column or radioactive
material is reported or expected to reach.
Note 4.- The international volcano number is allocated by
the International Association of Volcanology and Chemistry of
the Earth k Interior (IAVCEI) and is listed in the Manual on
Volcanic Ash, Radioactive Material and Toxic Chemical
Clouds (Doc 9691).
4.3.1.2 Recommendation.- On significant weather
charts, the inclusion of "CB" or the thunderstorm symbol
should be understood to include all weather phenomena normally
associated with cumulonimbus or thunderstorm, namely,
moderate or severe icing, moderate or severe turbulence and
hail.
4.3.1.3 Recommendation.- Significant weather charts
for low-level flights, including those in accordance with the
visualflight rules, operating up toflight level 100 (up toflight
level 150 in mountainous areas or highel; where necessary)
should show, as appropriate to theflight:
a) the phenomena warranting the issuance of a SIGMETas
given in Appendix 6 and which are expected to affect
low-level flights; and
b) the elements included in area forecasts for low-level
flights as given in Appendix 5 except elements r) and u)
concerning upper win& and upper-air temperatures and
forecast lowest QNH, respectively.
Note I.- Examples of the form of presentation of
significant weather charts are given in Appendix I.
Note 2.- Guidance on the use of terms "ISOL", "OCNL"
and "FRQ" refem'ng to cumulonimbus clouds and
thunderstorms is given in Appendix 6.
4.3.2 In other forms
Recommendation.- Whereflight documentation covering
the significant en-route weather conditions is not supplied in
chart form, it should be presented in tabular form and/or as an
abbreviated plain-language text.
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