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APPENDIX 2. TECHNICAL SPECIFICATIONS RELATED
TO WORLD AREA FORECAST SYSTEM AND METEOROLOGICAL OFFICES
(See Chapter 3 of this Annex.)
1. WORLD AREA FORECAST SYSTEM 1.2.4 The foregoing grid point forecasts shall be prepared
by a WAFC in a fixed grid with a horizontal resolution of
140 km.
1.1 Formats and codes
Note.- 140 la represents a distance of about 1.25' of
WAFCs shall adopt uniform formats and codes for the supply latitude.
of forecasts and amendments.
1.2 Upper-air wind, temperature
and humidity information
1.2.1 The forecasts of upper winds; upper-air temperatures;
and humidity; direction, speed and height of maximum
winds and tropopause heights and temperatures prepared four
times daily by a WAFC shall be valid for 6, 12, 18, 24, 30 and
36 hours after the time (0000, 0600, 1200 and 1800 UTC) of
the synoptic data on which the forecasts were based and shall
be available for start of transmission in the above order not
later than 6 hours after standard time of observation.
1.2.2 Recommendation.- The grid point forecasts
prepared by a WAFC should comprise:
a) wind and temperature data for flight levels 50
(850 hPa), 100 (700 hPa), 140 (600 hPa), 180
(SOOhPa), 240 (400 hPa), 300 (300 hPa), 340
(250 hPa), 390 (200 hPa) and 450 (150 hPa);
b) tropopause height and temperature, and direction, speed
and height of maximum wind;
c) humidity data for flight levels 50 (850 hPa), 100
(700 hPa), 140 (600 hPa) and 180 (500 hPa); and
d) wind and temperature data for flight levels 530
(100 hPa) and 600 (70 hPa) when and where required.
1.2.3 The foregoing grid point forecasts shall be issued by
a WAFC in binary code form using the GRIB code form
prescribed by WMO.
Note I.- The GRIB code form is contained in WMO
Publication No. 306, Manual on Codes, Volume 1.2, Part B -
Binary Codes.
Note 2.- WAFCs continue to issue forecasts of upper-air
wind and temperature in chart form in accordance with
regional air navigation plans until I July 2005.
1.3 Significant weather information
1.3.1 Forecasts of significant weather phenomena
prepared by WAFCs shall be issued four times a day for fixed
valid times of 0000,0600, 1200 and 1800 UTC. The transmission
of each forecast shall be completed as soon as technically
feasible but at least 12 hours before its validity time.
1.3.2 Forecasts of significant weather phenomena shall be
issued in binary code form, using the BUFR code form
prescribed by WMO.
Note I.- The BUFR code form is contained in WMO
Publication No. 306, Manual on Codes, Volume 1.2, Pait B -
Binary Codes.
Note 2.- WAFCs continue to issue forecasts of significant
weather in chart form in accordance with regional air
navigation plans until I July 2005.
1.3.3 Forecasts of significant weather phenomena shall
include all the items listed in Appendix 8, 4.3.1.1. The
forecasts shall be issued for the following flight levels:
a) between flight levels 250 to 630; and
b) between flight levels 100 to 250 for limited geographical
areas, as determined by regional air navigation
agreement. If the average elevation of the topography of
the area could extend a significant topographical effect
to flight level 100, a higher level should be specified for
the base of the charts, in consultation with the WAFC
concerned, and in accordance with regional air
navigation agreement.
1.3.4 Recommendation.- Amendments to forecasts of
signifcant weather phenomena should be issued with the minimum
possible delay in accordance with the criteria in 1.4 and
supplied in the form of amended BUFR files.
ANNEX 3 APP 2-1 25/11/04
Annex 3 - Meteorological Service for International Air Navigation Appendix 2
1.4 Criteria for amendments to WAFS products
Recommendation.- WAFCs should apply the following
criteria for the amendment of significant en-route weather
forecasts:
SWH forecasts:
turbulence, and occasional, Pequent or embedded
cumulonimbus
Newly expected occurrence or non-occurrence
SWM forecasts:
aircrafi icing, turbulence, cumulonimbus, and sandstorms/
duststorms
Newly expected occurrence or non-occurrence
Volcanic eruptions or the accidental release of radioactive
materials into the atmosphere, of significance to aircraji
operations:
Inclusion or removal of volcanic activity symbol, or
radiation symbol.
the originator. If it is considered necessary to issue an amendment,
an appropriate ADMIN message shall be transmitted to
all users through satellite broadcasts.
Note I.- There is no requirement for meteorological
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