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air navigation meeting. maximum surface wind of tropical cyclones.
Reporting point. A specified geographical location in relation Upper-air chart. A meteorological chart relating to a specified
to which the position of an aircraft can be reported. upper-air surface or layer of the atmosphere.
Rescue coordination centre. A unit responsible for promoting
efficient organization of search and rescue services and for
coordinating the conduct of search and rescue operations
within a search and rescue region.
Runway. A defined rectangular area on a land aerodrome
prepared for the landing and take-off of aircraft.
Runway visual range (RVR). The range over which the pilot
of an aircraft on the centre line of a runway can see the
runway surface markings or the lights delineating the
runway or identifying its centre line.
Search and rescue services unit. A generic term meaning, as
the case may be, rescue coordination centre, rescue
subcentre or alerting post.
wibility. Visibility for aeronautical purposes is the greater of:
a) the greatest distance at which a black object of suitable
dimensions, situated near the ground, can be seen and
recognized when observed against a bright background;
b) the greatest distance at which lights in the vicinity of
1000 candelas can be seen and identified against an
unlit background.
Note.- The two distances have dzfferent values in air of a
given extinction coefficient, and the latter b) varies with the
background illumination. The former a) is represented by the
meteorological optical range (MOR).
Volcanic ash advisory centre (VAAC). A meteorological
Service area (world area forecast system). A geographical centre designated by regional air navigation agreement to
area within which a world area forecast centre is respon- provide advisory information to meteorological watch
sible for issuing area forecasts to meteorological authorities offices, area control centres, flight information centres,
and other users. world area forecast centres and international OPMET data
banks regarding the lateral and vertical extent and forecast
SIGMET information. Information issued by a meteorological movement of ;olcanic ash in the atmosphere following
watch office concernin-g the occurrence or expected volcanic eruptions.
occurrence of specified en-route weather phenomena which
may affect the safety of aircraft operations. VOLMET. Meteorological information for aircraft in flight.
Standard isobaric surface. An isobaric surface used on a Data link- VOLMET (D-VOLMET). Provision of current
worldwide basis for representing and analysing the aerodrome routine meteorological reports (METAR) and
conditions -in the atmosphere. aerodrome special meteorological reports (SPECI),
aerodrome forecasts (TAF), SIGMET, special air-reports
Threshold. The beginning of that portion of the runway usable
for landing.
not covered by a SIGMET and, where available,
AIRMET via data link.
Touchdown zone. The portion of a runway, beyond the VOLMET broadcast. Provision, as appropriate, of current
threshold, where it is intended landing aeroplanes first METAR, SPECI, TAF and SIGMET by means of
contact'the runway. continuous and repetitive voice broadcasts.
Tropical cyclone Generic term for a non-frontal synoptic- World area forecast centre (WAFC). A meteorological centre
scale cyclone originating over tropical or sub-tropical designated to prepare and issue significant weather
waters with organized convection and definite cyclonic forecasts and upper-air forecasts in digital form on a global
surface wind circulation. basis direct to States by appropriate means as part of the
aeronautical fixed service.
World area forecast system (WAFS). A worldwide system by
which world area forecast centres provide aeronautical
* IS0 Standard 9000:2000 - Quality Management Systems - meteorological en-route forecasts in uniform standardized
Fundamentals and Vocabulary. - formats.
Chapter 1 Annex 3 - Meteorological Service for International Air Navigation
1.2 Terms used with a limited meaning
For the purpose of this Annex, the following terms are used
with a limited meaning as indicated below:
a) to avoid confusion in respect of the term "service"
between the meteorological service considered as an
administrative entity and the service which is provided,
"meteorological authority7' is used for the former and
"service" for the latter;
b) "provide" is used solely in connection with the
provision of service;
c) "issue" is used solely in connection with cases where the
obligation specifically extends to sending out the
information to a user;
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