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Meteorology
Under the movement of air in the cloud, small hailstones are carried along.
They grow larger and become asymmetrical, and rotation occurs, causing them
to grow up to 6 cm in diameter.
3.9.5.3 Turbulence in connection with CB clouds
The greatest turbulence problems occur with CB clouds.
The CB cloud moves in the same direction as the wind at FL 100.
During the phase with heavy precipitation (the middle stage), large amounts of
air or downdrafts are pulled through the cloud. The descent rate is high—up to
2500 ft/min.
A CB cloud can be felt
up to 10 NM away, so
keep this distance
from the cloud and be
cautious during
takeoff and landing if
CB clouds are close to
the airport.
Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 331
