1. Chapter 6 Lesson 3 Weather By: Tyler C. and Saagar D.

2. What Causes Severe Weather ?  Sometimes winds and the water cycle can lead to dangerous weather.  Severe weather includes thunderstorms, tornadoes, hurricanes, and monsoons.

3. Thunderstorms  Different areas of thunderstorms cloud have either positive or negative electrical charges.  Thunderstorms have three stages: - First stage: All air currents move upwards - Second Stage: Air currents are mixed - Final stage: All air currents move downwards

4. Tornadoes  Tornadoes are a rotating column of air that extends from a thunderstorm to the ground.  How tornadoes form: - Before thunderstorms form, winds change direction and increases in speed. Winds begin to spin. - As the thunderstorms form, air within it rises. The spinning air begins to tilt upwards. - The area of spinning grows wider. A tornado

5. Hurricanes  Hurricanes are a dangerous cyclonic storm made up of swirling bands of thunderstorms with wind speeds of at least 119 kilometers per hour that forms over warm ocean water.  How Hurricanes form: - Thunderstorms grow out of a tropical depression. - Air pressure at the ocean’s surface drops. Surface winds blow faster and begin to swirl. A tropical storm develops. -Thunderstorms begin to move in spiral bands. Air pressure drops lower, and surface winds blow faster. A hurricane in Hawaii

6. Monsoons  Monsoons forms when air over the ocean is cooler then air over land. Then, the moist air over the ocean moves towards land.  Tempered describes air that is warmed in winter and cooler in summer because it is near a large body of water.  A monsoon is a wind that changes direction with the season. A monsoon in India