Effects of Frontal Lifting
on forecasted precipitation
If there is sufficient moisture
in the air and a forcing mechanism like
a cold front
(for example) is approaching the area, then there is an
increased probability that precipitation will occur.
Clouds and precipitation are formed by the upward motion of air.
Therefore, there must be a mechanism present to lift the air.
Fronts often serve as such
Air on one side of the front typically blows in a different direction from
the wind on the other side, causing the air to converge, or pile up right
along the frontal surface.
Since this air has to go somewhere, it rises.
As air rises, the moisture in the rising air cools, condenses and