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Runway visual range observations are made when the visibility, measured by instruments, is
2 000 m or less at dusk and at night and 1 000 m or less during the day.
Not implemented due to the absence of ADS.
Forecasts for take-off are not prepared.
WAFCs are not notified.
APPENDIX 3
2.3.1 c) An alternative threshold value as agreed between the meteorological authority, the appropriate
ATS authority and operators concerned is used.
2.3.2* e) The visibility changes to or passes through 800 or 1 500 m; such reports are not required if the
runway visual range is indicated.
* Recommended Practice
g SPEC1 is also issued when a change occurs in the intensity of the following:
- drifting dust, sand or snow;
- blowing dust, blowing sand or blowing snow (including a snowstorm);
- thunderstorm (with or without precipitation);
- squall;
- funnel cloud (tornado or waterspout).
i) 30 m only for ICAO Category I1 aerodromes.
k)
4.1.4.3 a) Surface wind data are indicated in the runway operational direction for take-off and landing.
d) Variations from the mean wind speed (gusts) are reported as the maximum value of the wind
speed attained.
4.2.4.4* a) The observation site's location is not reported; the visibility value is given for the touchdown zone.
b) The term ')revailing visibilig" is not used; minimum visibility is used.
4.3.6.2* Runway visual range observations are made when the visibility, measured by instruments, is
2 000 m or less at dusk and at night and 1 000 m or less during the day.
4.3.6.4 The RVR value for the stop-end of the runway is not reported. The observation location is not
reported; the visibility value is given for the touchdown zone.
4.5.3* The value of 10 m is used as the criterion.
4.8.1.2* When the cloud base reaches 200 m or less, the measured height of the clouds in metres is
included in the SPECIAL, METAR and SPECI reports after the pressure group, with an indication
of this using the QBB index group.
APPENDIX 4
1.1 Not implemented due to the absence of ADS.
1.2
2.1
3.1.1 WAFCs are not notified.
3.1.2
3.1.4
APPENDIX 5
1.2.2* Minimum visibility is forecast.
1.3.1* c) For change groups, criteria are also used in the event of a change in intensity:
- low drifting dust, sand or snow;
- blowing dust, blowing sand or blowing snow (including a snowstorm);
* Recommended Practice
- thunderstorm (with rain, ice pellets, hail andor snow pellets, snow or a combination of these
elements);
- squall;
- funnel cloud (tornado or waterspout).
e), 1) 30 m only for aerodromes with Category II operations.
h)
2.2.3 Note Minimum visibility is forecast.
2.2.5 30 m only for aerodromes with Category II operations.
2.2.6
3 Forecasts for take-off are not prepared.
4.1.2 Route forecasts in the ROFOR code form are not issued. Plain language is used; the sequencing
order of the information is in accordance with the ROFOR code form.
APPENDIX 6
APPENDIX 10
Not used due to the absence. of an uplink.
Not used due to the absence of aeronautical mobile communications.
SIGMET messages are temporarily not included in VOLMET broadcasts.
* Recommended Practice
CHAPTER 6
6.6 Area forecasts for low-level flights as a GAMET area forecast are not issued.
Remark: GAMET area forecast will be introduced in 2005.
CHAPTER 7
7.4 Wind shear warnings are not issued.
Remark: Wind shear warnings are not issued unless appropriate and accurate sensors are available.
After the publication and study of the Manual on Wind Shear (Doc 98 17), Belgium will reconsider
the issuance of wind shear warnings. In the meantime, wind shear reports from pilots are included
in the MET report and the ATIS.
APPENDIX 3
4.1.2.1
APPENDIX 8
4.2.1.2
Surface wind displays are not clearly marked to identify the runway and the section of the runway
monitored by each sensor.
Remark: One sensor can be used for different runways, e.g. sensor indicator 25L is used at the
same time for RWY 25L TDZ and for RWY 07R END. The location (chart form) and use of all
wind sensors are indicated in the MET report operating procedures published in the Belgian AIP.
In local routine and special reports, ABV and BLW are used without indication of the maximum
value 2 000 m or the minimum value 50 m, respectively.
Remark: The values of ABV and BLW are indicated in the MET report operating procedures
published in the Belgian AIP.
Upper wind and upper-air temperature charts for low-level flights are not supplied for FL 020.
Remark: NWP model output data specifically issued for the Belgian territory and surroundings
have been used since 2003. The model output is currently being evaluated. If it is considered to be
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