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Chapter 17 Section 2 Severe Weather

Chapter 17 Section 2 Severe Weather. 1. Give some examples of severe weather. - thunderstorms, hurricanes, tornadoes, blizzards. 2. What does severe pose danger to?. - people, structures, and animals. heavy rain, lightning, thunder, and possibly hail

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Chapter 17 Section 2 Severe Weather

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  1. Chapter 17 Section 2 Severe Weather

  2. 1. Give some examples of severe weather. - thunderstorms, hurricanes, tornadoes, blizzards 2. What does severe pose danger to? - people, structures, and animals • heavy rain, lightning, thunder, and possibly hail • 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 3. Describe a thunderstorm.

  3. 4. What causes the strong winds in thunderstorms? - sinking rain cooled air and strong updrafts of warm air 5. What kind of damage can thunderstorms cause? • flash flooding in streams- occur with little warning • winds- greater than 89 km/h classified as a severe thunderstorm • hail- dent cars, destroy crops

  4. 6. What causes lightning? • 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

  5. 7. What causes thunder? • 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. What is a tornado? - a violently rotating column of air in contact with the ground 9. What is wind shear? - the difference in wind speed and direction during thunderstorms

  6. 10. How is a tornado formed? • wind shear creates a rotating column of air parallel to the ground • a thunderstorms updraft can tilt the column upward and create a funnel cloud • if the funnel cloud touches Earth it is a tornado • 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 roof and blow out walls 11. What kind of damage can tornadoes cause?

  7. 12. What is a hurricane? • 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 13. What are typhoons? - storms like hurricanes that form in the Pacific Ocean 14. What are cyclones? - storms like hurricanes that form in the Indian Ocean

  8. 15. How do hurricanes form? • 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 16. What kind of damage can hurricanes cause? • flooding • destroy crops, demolish buildings, and kill people and animals • heavy winds, high waves

  9. 17. What is a blizzard? • winds 56 km/h • temperature is low • visibility is less than 400 m • snow or blowing snow lasting for 3 or more hours 18. When is a severe weather watch issued? - when conditions are favorable for severe thunderstorms, tornadoes, floods, blizzards, and hurricanes 19. When is a severe weather warning issued? - when severe weather conditions already exist

  10. 20. What should you do during a severe thunderstorm or tornado? - take shelter in a basement or middle room away from windows 21. What should you do during a blizzard? - stay indoors

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