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offices to report incidents of radiological emergencies.
Note 2.- Guidance on reporting significant discrepancies
is provided in the Manual of Aeronautical Meteorological
Practice (Doc 8896).
3. METEOROLOGICAL WATCH OFFICES
3.1 Use of WAFS products
The extent to which a meteorological watch office makes use
of products from WAFCs and other sources shall be
determined by the meteorological authority concerned.
. 4. VOLCANIC ASH ADVISORY CENTRES (VAAC)
2. METEOROLOGICAL OFFICES
4.1 Volcanic ash advisory information
2.1 Use of WAFS products 4.1.1 Recommendation.- The advisor-y in-f ormation on
volcanic ash issued in abbreviated plain language, using
2.1.1 The extent to which an aerodrome meteorological approved IcAO abbreviations and numerical values of selfoffice
prepares forecasts makes use of from explanatory nature, should be in accordance with the template
WAFCs and other sources shall be determined by the meteoro- shown in Table A2-l. When no IcAO abbreviations
logical authority concerned. are available, English plain language text, to be kept to a
2.1.2 Recommendation.- Aerodrome meteorolo~ical
minimum, should be used.
u
ofices should use output products of the world area forecast
system in the preparation offlight documentation. 4.1.2 Recommendation.- The volcanic ash advisory
information listed in Table A2-I, when issued in graphical for-
2.1.3 In order to ensure and standardization of mat>s hould be as specified in ~ ~ ~ e nId. wi hre n issued in
flight documentation, the WAFS GMB and BUFR data bina~formatt,h e BUFR code form should be used.
received shall be decoded into standard WAFS charts in accordance
with relevant provisions in this Annex, and the Note.- The BUFR code form is contained in WMO
content and identification of the originator of the WAFS Publication NO. 306, Manual on Codes, Volume 1.2, Part B -
forecasts shall not be amended. Binary Codes.
2.2 Notification of WAFC concerning
significant discrepancies 5. STATE VOLCANO OBSERVATORIES
Meteorological offices using WAFS GRIB and/or BUFR data
shall notify the WAFC concerned immediately if significant 5.1 Information from State
discrepancies in accordance with 1.4 are detected or reported volcano observatories
in respect of WAFS data and products. The WAFC receiving
the message shall acknowledge its receipt to the originator, Recommendation.- The information required to be sent
together with a brief comment on the report and any action by State volcano observatories to their associated ACCs,
taken, using the same means of communication employed by MWO and VAAC should comprise for:
25/11/04 APP 2-2
Appendix 2 Annex 3 - Meteorological Service for International Air Navigation
a) significant pre-eruption volcanic activity: the datehime
(UTC) of report; name and, f known, number of the
volcano; location (latitude/longitude); and description
of volcanic activity; and
b) volcanic eruption: the datehime (UTC) of report and
time of eruption (UTC) f dzflerent fiom time of report;
name and, f known, number of the volcano; location
(1atitudeAongitude); and description of the eruption
including whether an ash column was ejected and, fso,
an estimate of height of ash column and the extent of
any visible volcanic ash cloud, during and following an
eruption.
Note.- Pre-eruption volcanic activity in this context means
unusual and/or increasing volcanic activity which could
presage a volcanic eruption.
6. TROPICAL CYCLONE ADVISORY CENTRES
(TCAC)
6.1 Tropical cyclone advisory information
6.1.1 Recommendation.- The advisory information on
tropical cyclones should be in accordance with the template
shown in Table A2-2.
6.1.2 Recommendation.- When the tropical cyclone
advisory information is issued in binary format, the BUFR
code form should be used.
Note.- The BUFR code form is contained in WMO
Publication No. 306, Manual on Codes, Volume 1.2, Part B -
Binary Codes.
APP 2-3
Annex 3 - Meteorological Service for International Air Navigation
Table A2-1. Template for advisory message for volcanic ash
Key: M = inclusion mandatory, part o f every
message;
0 = inclusion optional;
-- -- a double line indicates that the text
following it should be placed on the
subsequent line
Note I.- The ranges and resolutions for the numerical
elements included in advisory messages for volcanic ash are
shown in Appendix 6, Table A6-4.
Note 2.- The explanations for the abbreviations can be
found in the Procedures for Air Navigation Services - I C A O
Abbreviations and Codes (PANS-ABC, Doc 8400).
Note 3.- Inclusion of a "colon" after each element
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