Internal Climate Variability Some key
concepts:
Recall that high pressure is associated with cold temperatures and sinking
motion. The sinking motion occurs because surface
air moves away from the high pressure center under the influence of gravity, and draws down air
from above.
Conversely, low pressure is associated with warm temperatures and rising
motion. The rising motion occurs because surface air
converges on an area of low pressure under the influence of gravity, forcing rising motion over the
low.
Thus a low often brings precipitation with it, while a high bring clear skies.