A measure of atmospheric moisture, specifically the temperature to which the air must be cooled to reach saturation, assuming constant moisture and pressure. When the air reaches dewpoint, visible drops of water form.
The changing of wind direction with height.
To split and move out in different directions from a single point, usually said of horizontal winds. Divergence at upper levels of the atmosphere enhances upward motion, and hence the potential for thunderstorm development.
A powerful downdraft often associated with an intense thunderstorm that strikes the ground and deflects in all directions. A downburst may produce damaging surface winds.
A small-scale column of air that rapidly sinks toward the ground, usually accompanied by precipitation as in a shower or thunderstorm. A downburst is the result of a strong downdraft.