Created by Roger Edwards, Storm Prediction Center In this
enhanced water vapor image, color progressions from gray thru
bright blue to deep blue indicated more moisture; while black
through deep red means drying. Often, areas of strong drying
correspond to sinking motion in the upper levels; and areas of
high moisture content signal rising motion. Such is cearly the
case with this image of Bertha, where tremendous amounts of
moisture are being pumped high into the atmosphere near the
center of the hurricane. The bright blue dot is the eye, which
contains much less moisture than the surrounding CDO (Central
Dense Overcast). Note the broad arc of banded, gray-and-blue
enhanced material (cirrus clouds) arcing northward out of the
hurricane. This is an upper-level outflow channel, marked by the
cirrus arc. This cirrus arc was spiraling outward, away from the
storm. As large and intense low pressure areas, hurricanes in
the northern hemisphere rotate cyclonically (counterclockwise)
from the surface up through most