1. Storms
Chapter 6.4

2. Storm A violent disturbance in the atmosphere. Involves…
*sudden change in air pressure
*rapid air movements

3. How do the different types of storms form?
Winter Storms – dry, cold air masses move over lakes picking up water vapor and heat resulting in heavy snows
Thunderstorms – form in large cumulonimbus clouds
Hurricanes – begin over warm ocean water as a low-pressure area
Tornadoes – develop in thick cumulonimbus clouds

4. Winter storms
As cold, dry air moves across the warmer water, it becomes more humid as water vapor from the lake surface evaporates. When the air reaches land and cools, snow falls.
Chicago,
because it is west
of Lake Michigan

5. Thunderstorm
A small storm with heavy precipitation and frequent thunder and lightning.
Form in…
large cumulonimbus clouds known as thunderheads

6. How thunderstorms form pg. 210
Cold air moves
downward
Warm, humid
air rises.

7. Lightning
An energy discharge caused when charges jump between parts of a cloud, between clouds, or between the clouds and the ground.

8. Hurricane A tropical cyclone with winds of 119 km/h or higher.
Hurricanes begin over warm ocean water as a low-pressure area, or tropical disturbance.

9. Hurricane pg. 212
weak
strong
strong

10. Hurricane strength is ranked on the Saffir-Simpson Hurricane Scale.

11. Storm surge
A “dome” of water that sweeps across the coast where the hurricane lands.
This can…
*wash away beaches
*destroy coastal buildings
*erode coastlines

12. Hurricane Video clip

13. Tornado
A rapidly whirling, funnel-shaped cloud that reaches down to touch Earth’s surface.
Commonly develop in thick cumulonimbus clouds.
If over water, called a waterspout.

14. Pg. 214
1. Is the risk of tornadoes in Florida relatively low or relatively high?
2. Which state might have
more tornadoes than Florida?
Relatively high

15. Tornado Hits

17. I get it! Now I know that the main kinds of storms are… pg. 215
Winter storms
2. Thunderstorms
3. Hurricanes
4. Tornadoes