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A tormado is a violently rotating column of air that extends from a thunderstorm to the
ground and is often - although not always - visible as a funnel cloud. Lightening and hail are
common in thunderstorms that produce tormadoes. Tornadoes cause extensive damage to
structures and disrupt transportation, power, water, gas, communications, and other services
in its direct path and in neighbouring areas. Related thunderstorms can cause heavy rains,
flash flooding, and hail.
About 1,200 tornadoes hit the United States every year and every state is at risk. Most
tornadoes in the United States occur east of the Rocky Mountains with concentrations in the
central and southern plains, the Gulf Coast and Florida.
Tornadoes can strike in any season, but occur most often in the spring and summer
months. They can occur at all hours of the day and night, but are most likely to occur
between 3 p.m. and 9 p.m.
a. Answer the following questions.
1. What is a tornado?
2. What is common in thunderstorms that produce tornadoes?
3. What can related thunderstorms cause?
4. How many tornadoes hit the United States every year?
5. Which seasons can tomadoes strike?