First gust

FIRST GUST
Another name for the initial wind surge observed at the surface as the result of downdrafts forming the leading edge or gust front of a thunderstorm.

first gust—The leading edge of the spreading downdraft, plow wind, from an approaching thunderstorm.
flow line—A streamline.

STRAIGHT-LINE WINDS Any surface wind that is not associated with rotation. An example is the first gust from a thunderstorm, as opposed to tornadic winds.

See also: Wind, Surface, Thunderstorm, Thunder, Gust