stable

Entry: Aerodrome mean wind direction - showing version 1

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.

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is a Concept | quantity kind | space and time quantity kind
submitted bymarqh (admin)

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date submitted 3 Sep 2014 09:53:17.708
definition
entity Aerodrome mean wind direction
source graph graph

description 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.
item class space and time quantity kind | Concept | quantity kind
label Aerodrome mean wind direction
notation aerodromeMeanWindDirection
register quantity kind
status status stable
submitter
name marqh (admin)
openid 100578379482821123729

type register item
version info 1
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Definition

description 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.
dimensions dimensionless
discipline Aeronautical quantity kinds
label Aerodrome mean wind direction
notation aerodromeMeanWindDirection
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.
type Concept | quantity kind | space and time quantity kind