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the PANS-ATM (Doc 4444). Appendix I . reported as indicated in Table A4-2.
Note 2.- h the case of a special air-report of pre-eruption
volcanic activity. volcanic eruption or volcanic ash cloud,
additional requirements are indicated in 4.2.
2.6.2 Interpretation of the turbulence index
Turbulence shall be considered:
a) severe when the turbulence index is between 15 and 27
(i.e. the peak value of the EDR is exceeding 0.5);
2. CRITERIA FOR REPORTING
b) moderate when the turbulence index is between 6 and 14
(i.e. the peak value of the EDR is exceeding 0.3 while
2.1 When air-g-r ound data link is used. the wind direction. not exceeding 0.5);
wind speed, wind quality flag, temperature, turbulence and
c) light when the turbulence index is between 1 and 5 (i.e.
humidity included in air-reports shall be reported in accordance
with the following criteria. the peak value of the EDR is between 0.1 and 0.3); and
d) nil when the turbulence index is 0 (i.e. the peak value of
the EDR is less than 0.1).
2.2 Wind direction
Note.- The EDR b an aircraft-independent measure of
The wind direction shall be reported in of degrees turhlence. However, the relationship between the EDR index
rounded to the nearest whole degree. and the perception of turbulence b afiurction of aircraft type,
and the mass, altitude, configuration and airspeed of the
aircraft.
2.3 Wind speed
2.6.3 Special air-reports
The wind speed shall be reported in kilometres per hour or
knots, rounded to the nearest 2 lanh (1 knot). The units used Special air-reports on turbulence shall be made during any
shall be indicated. phase of the flight whenever the peak value exceeds the EDR
25/11/04 APP 4-2
Appendix 4 Annex 3 - Meteorological Service for International Air Navigation
value of 0.5. The special air-report on turbulence shall be 3.3 Supplementary dissemination of air-reports - -
made with reference to the 1-minute period immediately preceding
the observation. Both the average and peak value of Recommendation, Where supplementary dissemination
turbulence shall be observed. The average and peak values of air-reports is required to sat& special aemnautical or
shall be reported in terms of a turbulence index as indicated in meteorological requirements, such dissemination should be
the shaded part of Table A4-1. Special air-reports shall be arranged between the meteorological authorities concerned.
issued every minute until such time that the peak values of
turbulence fall below the EDR value of 0.5.
3.4 Format of air-reports
2.7 Humidity
Air-reports shall be exchanged in the format in which they are
The humidity shall be reported as the relative humidity, received, except that when voice communications are used, if
the position.is given by reference to an ATS reporting point, it
rounded to the nearest whole per cent.
shall be converted, by the meteorological watch office, into the
corresponding latitude and longitude. Note.- The ranges and resolutions for the meteomlogical
elements included in air-reports are shown in Table A4-4.
3. EXCHANGE OF AIR-REPORTS
3.1 Responsibilities of the meteorological
watch offices
4. SPECIFIC PROVISIONS RELATED TO
REPORTING WIND SHEAR AND VOLCANIC ASH
4.1 Reporting of wind shear
4.1.1 Recommendation.- When reporting aircrafi
3.1.1 The meteorological watch offices shall assemble the observations of wind shear encountered during the climb-out
routine air-reports received by voice communications and shall and approach phases of flight, the aircraft type should be
disseminate them to WAFCs and other meteorological offices
included.
in accordance with regional air navigation agreement.
Note.-- The exchange of collectives on an hourly basis may
be found desirable when reports are numerous.
3.1.2 The meteorological watch office shall transmit
without delay the special air-reports received by voice
communications to WAFCs.
3.1.3 The meteorological watch office shall transmit
without delay special air-reports of pre-eruption volcanic
activity, a volcanic eruption or volcanic ash cloud received to
the associated VAACs.
3.1.4 When a special air-report is received at the meteorological
watch ofice but the forecaster considers that the
phenomenon causing the report is not expected to persist and,
therefore, does not warrant issuance of a SIGMET, the special
air-report shall be disseminated in the same way that SIGMET
messages are disseminated in accordance with Appendix 6,
1.2.1, i.e. to meteorological watch offices, WAFCs, and other
meteorological offices in accordance with regional air navigation
agreement.
3.2 Responsibilities of world area forecast centres
　
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