Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 1018

b) 10 minutes for METAR and SPECI, except that when the 10-minute period includes a marked discontinuity in the wind direction and/or speed, only data occurring since the discontinuity shall be used for obtaining mean values, hence the time interval in these circumstances should be correspondingly reduced. 2007/70/II. szám Annex 3 — Meteorological Service for International Air Navigation Appendix 3 25/11/04 APP 3-4 Note.— A marked discontinuity occurs when there is an abrupt and sustained change in wind direction of 30° or more, with a wind speed of 20 km/h (10 kt) before or after the change, or a change in wind speed of 20 km/h (10 kt) or more, lasting at least 2 minutes. 4.1.3.2 Recommendation.— The averaging period for measuring variations from the mean wind speed (gusts) reported in accordance with 4.1.4.2 c) should be 3 seconds for local routine and special reports and for METAR and SPECI and for wind displays used for depicting variations from the mean wind speed (gusts) in air traffic services units. 4.1.4 Reporting 4.1.4.1 In local routine and special reports and in METAR and SPECI, the surface wind direction and speed shall be reported in steps of 10 degrees true and 1 kilometre per hour (or 1 knot), respectively. Any observed value which does not fit the reporting scale in use shall be rounded to the nearest step in the scale. 4.1.4.2 In local routine and special reports and in METAR and SPECI:

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