Hurricanes can spawn tornadoes

Hurricanes can spawn tornadoes
http://www.aip.org/isns/reports/2005/012.html

Even if you're not in Hurricane Katrina's path, you may be feeling its
effects if a tornado comes nearby. Scientists have discovered that
hurricanes can actually encourage the formation of tornadoes. When
meteorologists studied hurricane-related damage, they found some damage
that didn't fit the pattern, and discovered it was actually damage
resulting from hurricane-related tornadoes.

How tornadoes form

Air is a gas and water is a liquid, but in the realm of science, both
fall into the category of fluids. When a fluid's flow is disturbed
somehow, it causes turbulence. For instance, branches sticking into and
under the water can disrupt the flow of a stream, forming tiny eddies
or whirlpools. The same thing happens when you move your hand quickly
through water. Technically, these are known as vortices. The water
moves in a circular motion around a central point, and this causes a
depression or cavity to form in the center, which draws flowing objects
towards that center. Think of water spinning down the bathroom drain.

These sorts of swirling vortices can also form in air. As a
thunderstorm develops, if the wind speeds up and changes direction,
this can cause a horizontal spinning effect in the lower atmosphere. As
air rises, pulled upwards by the developing thunderstorm, it tilts the
horizontal rotation into a vertical rotation. A tornado is simply a
violently rotating column of air that extends from a thunderstorm in
the atmosphere to the ground. The pressure inside can be 10% lower than
the surrounding air, and this causes that air to rush towards the
low-pressure center from all directions. As it streams inward, the air
spirals upward around the core until it merges with the airflow of the
thunderstorm that gave rise to the tornado.