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variable wind
Fonte1
INTERNATIONAL CIVIL AVIATION ORGANIZATION. Manual of aeronautical meteorological practice. 10th. ed. Montreal, 2015. (Doc. 8896 AN/893).
Fonte2
WORLD METEOROLOGICAL ORGANIZATION. Manual on codes: international codes: volume I.1: annex II to the WMO technical regulations: parte A: annex II to the WMO technical regulations. Geneva, 2011. (WMO, n.306).
Nota adicional1
Acronym in English: VRB
Contexto
The mean speed is less than 1.5 m/s (3 kt) and the wind direction varies by less than 180°: indicate the wind direction by the term “variable” (VRB) followed by the mean wind speed, with no indication of the mean wind direction, e.g.: mean surface wind direction 10°, wind speed 1 m/s, wind direction variable between 350° and 050°.
In the case of variable wind direction, ddd shall be encoded as VRB when the mean wind speed is less than 1.5 m s–1 (3 knots). A variable wind at higher speeds shall be reported only when the variation of wind direction is 180° or more or when it is impossible to determine a single wind direction, for example when a thunderstorm passes over the aerodrome.
Português
vento variável