Figure 1-1.-Generalized vertical circulation overdeveloping highs and lows.
and downward in the anticyclone. The upper vertical
circulation involves downward motion in the
stratosphere of the developing cyclone and upward
motion in the upper troposphere and lower stratosphere
of the developing anticyclone. See figure 1-1.
Divergence and upper-height falls are associated
with high-speed winds approaching weak contour
gradients which are cyclonically curved. Figure 1-2
illustrates contour patterns associated with height falls,
Convergence and upper-height rises are associated
with the following:
. Low-speed winds approaching straight or
cyclonically curved strong contour gradients. See
figure 1-3, view (A).
. High-speed winds approaching anticyclonically
curved weak contour gradients.
See figure 1-3, view
Figure 1-2.-Divergence Illustrated.
Figure 1-3.-Convergence Illustrated.