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PRESSURE GRADIENT FORCE
Pressure differences must create a force in order
to drive the wind. This force is the pressure
gradient force. The force is from higher pressure to
lower pressure and is perpendicular to isobars or
contours. Whenever a pressure difference develops
over an area, the pressure gradient force begins
moving the air directly across the isobars. The
closer the spacing of isobars, the stronger is the
pressure gradient force. The stronger the pressure
gradient force, the stronger is the wind. Thus,
closely spaced isobars mean strong winds, widely
spaced isobars mean lighter wind. From a pressure
analysis, you can get a general idea of wind speed
from contour or isobar spacing.
Because of uneven heating of the Earth, surface
pressure is low in warm equatorial regions and high
in cold polar regions. A pressure gradient develops
from the poles to the Equator. If the Earth did not