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Updating period of local reports especially in automated mode

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AMOFSG/7-SN No. 22


0 AMOFSG7SN NO 22 AMOFSG7SN NO 22 12808 AERODROME


AMOFSG/7-SN No. 22

12/8/08



AERODROME METEOROLOGICAL OBSERVATION AND FORECAST STUDY GROUP (AMOFSG)


SEVENTH MEETING



Montréal, 9 to 12 September 2008



Agenda Item

5:

Aerodrome observations


UPDATING PERIOD OF LOCAL REPORTS, ESPECIALLY IN AUTOMATED MODE



(Presented by Michel Leroy)


SUMMARY

This paper deals with the periodicity of updating local reports.

It suggests an updating period of 1 minute with automated system, thus limiting the need of special local reports.

It suggests an addition to the content of Annex 3.



  1. INTRODUCTION

    1. ICAO Annex 3 — Meteorological Service for International Air Navigation does not define the periodicity of transmission of local reports.

    2. Criteria for issuing local special reports are defined.

    3. Appendix 3, 3.2.2 mentions that “by agreement between the meteorological authority and the appropriate ATS authority, they (local special reports) need not be issued in respect of: a) any element for which there is in the local air traffic services unit a display ….”.

  2. DISCUSSION

    1. Wind, RVR (when applicable) air temperature, dew-point temperature and QNH (+QFE) are currently automatically reported. When automatically measured, their values are usually updated at least every minute. They are usually displayed in the local air traffic services.

    2. With automated observing systems, visibility, present weather, cloud layers (amount and height of cloud base, possibly cloud type) are usually updated at least every minute.

    3. Thus automated observing systems are able to update and disseminate local reports at least every minute.

    4. In France, wind, RVR (when applicable), air temperature, dew-point temperature and QNH (+QFE) are updated and distributed in local reports every minute.

    5. In France, when a human observer is present, his or her observation of visibility, present weather and clouds is updated and distributed every hour or 30 minutes in local reports; special local reports being issued when criteria are met.

    6. In France, when the observing system is fully automated (or works in automated mode), all the parameters of a local report, including visibility, present weather and clouds are distributed in local reports every minute. They are usually displayed in the local air traffic services. With this practice, special local reports don’t need to be issued.

    7. The frequent distribution of local reports would simplify the management of special local reports and possibly the observation work load, reducing the complexity of the system and the need for special local reports.

  3. CONCLUSION

    1. It is suggested to recommend the updating periodicity of local reports in Annex 3. A short updating period of one minute could simplify the system, by avoiding special local reports with automated systems, updating all the required parameters every minute.

    2. This updating period should be taken into account by the ATIS.

  4. ACTION BY THE GROUP

    1. The AMOFSG is invited to:

  1. note the information in this paper; and

  2. decide on the draft actions proposed for the group’s consideration.



— END —



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Tags: amofsg7sn, aerodrome, 12808