EA: VARIABLE_WIND_START_DIRECTION
Status:
STD 2005/06/07
Code:
1501
Concept definition:
The <<
GEODETIC_AZIMUTH
>> of the starting extreme in <<
WIND_DIRECTION
>> under variable <<
WIND_DIRECTION
>> conditions. Variable wind start direction is normally only reported for <<
WIND_SPEED
>>s exceeding 3,09 metres per second (six knots) and the variability must equal or exceed a range of 60 arc degrees during the preceding two minutes.
Attribute value type:
REAL
Unit equivalence class label:
PLANE_ANGLE
Reference type:
PR
Reference:
[
JMCDM
, "WIND-OBSERVATION variable start direction angle"]
Supplemental references:
Group membership:
ANGULAR_MEASURE
ATMOSPHERE
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