Chapter 6 Lesson 3

1. Chapter 6Lesson 3 Weather By: Tyler C. andSaagar 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 ofthunderstormscloud have either positive or negative electrical charges. • Thunderstormshave three stages: - First stage: All air currents move upwards - Second Stage: Air currents are mixed - Final stage: All air currents move downwards

4. Tornadoes • Tornadoesare 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 • Hurricanesare 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. • HowHurricanesform: - 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 • Monsoonsforms when air over the ocean is cooler then air over land. Then, the moist air over the ocean moves towards land. • Tempereddescribes air that is warmed in winter and cooler in summer because it is near a large body of water. • Amonsoonis a wind that changes direction with the season. A monsoon in India