3. -Thunderstorms, hurricanes, tornadoes, blizzards, typhoons, cyclones -Dangerous to people, structures, and animals

4. - Occur in warm, moist air masses and along fronts - Begin with warm, moist air being forced up and forming cumulonimbus clouds - Rain cools the air which sinks and spreads over the Earth - Heavy rain, lightning, thunder, and possibly hail - Strong winds caused by sinking rain cooled air and strong updrafts of warm air

5. - Flash flooding in streams- occur with little warning - Winds- greater than 89 km/h classified as a severe thunderstorm - Hail- dented cars, destroyed crops

6. - Warm air is lifted and cool air sinks in clouds which causes parts of a cloud to become oppositely charged (+ - ) - When a current flows between regions of opposite electrical charge, lightning flashes - Can occur in a cloud, between clouds, or between a cloud and the ground

7. - Lightning heats the air around it to temperatures of about 30,000°C - Heated air expands rapidly then cools quickly and contracts - Rapid movement of the molecules forms sound waves heard as thunder

8. - A violently rotating column of air in contact with the ground

9. - Wind shear (difference in wind speed and direction) creates a rotating column of air parallel to the ground - A thunderstorm updraft can tilt the column upward and create a funnel cloud - If the funnel cloud touches Earth it is a tornado

10. - Winds can rip apart buildings and uproot trees - Can lift animals and houses into the air. - Winds can blow through open windows and blow off roofs and blow out walls.

11. - Most powerful storm - Large, swirling low pressure system that forms over the warm Atlantic Ocean - Turns heat energy from the ocean into wind. - Winds of at least 119 km/h - Typhoons form in the Pacific Ocean - Cyclones form in the Indian Ocean

12. - Low pressure system forms in Atlantic or Pacific Ocean - Winds in northern hemisphere rotate counterclockwise. - Pushed by surface winds west - Gain strength from heat and moisture of warm ocean water

13. - Flooding - Destroy crops, demolish buildings, and kill people and animals. - Heavy winds, high waves.

14. - Winds 56 km/h - Temperature is low - Visibility is less than 400 m - Snow or blowing snow lasting for 3 or more hours

15. - When conditions are favorable for severe thunderstorms, tornadoes, floods, blizzards, and hurricanes - When severe weather conditions already exist

16. -If a thunderstorm, tornado, or hurricane is coming take shelter in a basement, bathroom, or middle room away from windows -If a blizzard is coming stay indoors