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contact point of the national meteorological service in each
State. This contact point has the responsibility of
redistributing the RSMC products within the State concerned.
3.4.3 Recommendation.- The boundaries of the area
over which meteorological watch is to be maintained by a
meteorological watch office should, in so far as is practicable,
be coincident with the boundaries of a jlight information
region or a control area or a combination ofjlight information
regions andor control areas.
3.4.4 Recommendation.- Meteorological watch should
be maintained continuously; however; in areas with a low
density of traffic the watch may be restricted to the period
relevant to expectedjlight operations.
c) supply SIGMET information and, as required, other
meteorological information to associated air traffic 3.5 Volcanic ash advisory centres
services units;
3.5.1 A Contracting State, having accepted, by regional
d) disseminate SIGMET information; air navigation agreement, the responsibility for providing a
Chapter 3 Annex 3 - Meteorological Service for International Air Navigation
VAAC within the framework of the international airways 3.5.2 Volcanic ash advisory centres shall maintain a
volcano watch, shall arrange for that centre to respond to a 24-hour watch.
notification that a volcano has erupted, or is expected to erupt
or volcanic ash is reported in its area of responsibility, by
arranging for that centre to:
3.6 State volcano observatories
a) monitor relevant geostationary and polar-orbiting
satellite data to detect the existence and extent of
volcanic ash in the atmosphere in the area concerned;
b) activate the volcanic ash numerical trajectory/dispersion
model in order to forecast the movement of any ash
"cloud" which has been detected or reported;
Note.- The numerical model may be its own ol; by
agreement, that of another VAAC.
c) issue advisory information regarding the extent and
forecast movement of the volcanic ash "cloud" to:
1) meteorological watch offices, area control centres
and flight information centres serving flight information
regions in its area of responsibility which
may be affected;
2) other VAACs whose areas of responsibility may be
affected;
3) world area forecast centres, international OPMET
data banks, international NOTAM offices, and
centres designated by regional air navigation
agreement for the operation of aeronautical fixed
service satellite distribution systems; and
4) airlines requiring the advisory information through
the AFTN address provided specifically for this
purpose; and
Note.- The AFTN address to be used by the
VAACs is given in the Handbook on the International
Airways Volcano Watch (IAVW) (Doc 9766) and at:
http://www. icao. int/icao/en/an b/met/index. html.
d) issue updated advisory information to the meteorological
watch offices, area control centres, flight
information centres and VAACs referred to in c), as
necessary, but at least every six hours until such time as
the volcanic ash "cloud" is no longer identifiable from
satellite data, no further reports of volcanic ash are
received from the area, and no further eruptions of the
volcano are reported.
Contracting States that maintain volcano observatories
monitoring active volcanoes shall arrange that selected State
volcano observatories, as designated by regional air navigation
agreement, observing significant pre-eruption volcanic
activity, a volcanic eruption andfor volcanic ash in the
atmosphere shall send this information .as quickly
practicable to its associated ACC, MWO and VAAC.
Note.- Pre-eruption volcanic activity in this context means
unusual andor increasing volcanic activity which could
presage a volcanic eruption.
3.7 Tropical cyclone advisory centres
A Contracting State having accepted, by regional air navigation
agreement, the responsibility for providing a TCAC
shall arrange for that centre to:
a) monitor the development of tropical cyclones in its area
of responsibility, using geostationary and polar-orbiting
satellite data, radar data and other meteorological
information;
b) issue advisory information concerning the position of
the cyclone centre, its direction and speed of movement,
central pressure and maximum surface wind near the
centre; in abbreviated plain language to:
1) meteorological watch offices in its area of responsibility;
2) other TCACs whose areas of responsibility may be
affected; and
3) world area forecast centres, international OPMET
data banks, and centres designated,by regional air
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