Entry: Aerodrome mean wind direction
stable
URI: http://codes.wmo.int/common/quantity-kind/aerodromeMeanWindDirection
The mean true direction in degrees from which the wind is blowing over the 10-minute period immediately preceding the observation. When the 10-minute period includes a marked discontinuity in the wind characteristics (1), only data after the discontinuity shall be used for mean wind direction and variations of the wind direction, hence the time interval in these circumstances shall be correspondingly reduced.
Definition
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The mean true direction in degrees from which the wind is blowing over the 10-minute period immediately preceding the observation. When the 10-minute period includes a marked discontinuity in the wind characteristics (1), only data after the discontinuity shall be used for mean wind direction and variations of the wind direction, hence the time interval in these circumstances shall be correspondingly reduced.
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dimensionless
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Aeronautical quantity kinds
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Aerodrome mean wind direction
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| notation |
aerodromeMeanWindDirection
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| note |
(1) A marked discontinuity occurs when there is an abrupt and sustained change in wind direction of 30° or more, with a wind speed of 5 m s-1 (10 KT) or more before or after the change, or a change in wind speed of 5 m s-1 (10 KT) or more, lasting at least two minutes.
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Concept
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| space and time quantity kind
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