A condition when (1) the wind direction fluctuates by 60 degrees or more during the 2-minute evaluation period and the wind speed is greater than 6 knots; or (2) the direction is variable and the wind speed is 6 knots or less:
VARIABLE WIND DIRECTION
Meaning of VARIABLE WIND DIRECTION in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012