1. What type of clouds are needed for a tornado to form?

2. When does a funnel officially become a tornado?

3. When viewed from above, what direction do most tornadoes in the northern hemisphere rotate?

4. Around how wide is the typical tornado in the United States?

5. What do we call a tornado that forms over water?

6. What type of tornado has more than one spinning tube of air?

7. What type of tornado is produced by a huge thunderstorm?

8. What is the region in the Midwest called where most of the tornadoes in the United States form?

9. What country has the most tornadoes in the world each year?

10. What type of alarm means that a tornado is happening right now or is going to happen soon?