1. Severe Weather

2. Thunderstorm time lapse
Storm that generates lightning and thunder; often produces gusty winds, heavy rain, hail
From cumulonimbus cloud(s) along a cold front
Occurs all over the earth (most in the tropics) when warm, humid air rises in an unstable environment
Thunderstorm time lapse

3. Stages in the Development of a Thunderstorm1: 2: 3:
Mature stage:
Simultaneous updraft and downdraft create strong winds
Raindrops merge and get bigger as they fall long distance through cloud

4. Hail formation Balls of ice that fall from a cumulonimbus cloud
Ice gets swept up and down in updrafts inside cloud
Grow larger as water refreezes each time they rise

5. Largest Recorded Hailstone
Makes no sense without caption in book

6. Lightning During mature storm stage
Updrafts and downdrafts rub against each other, building up static electricity
Bottom becomes negatively charged; ground is positively charged
May occur within a cloud, between clouds, or from cloud to ground
How Stuff Works:
Lightning

7. Tornado
Violently rotating column of air touching earth and cumulonimbus cloud
Most form during severe thunderstorms

8. Tornadoes

9. Video:
Tornado Crosses
Kansas Highway

10. Tornado Intensity Fujita Scale: rates storm by damage caused
Tornado safety
Watch: conditions are right for a tornado
Warning: tornado has been sighted
BBC Tornado Animation

11. Other names: Typhoon (Pacific Ocean), Willy-willy (Australia)
Hurricane
Large areas of low pressure rotating counter clockwise
Central eye is an area of high pressure
Season starts in June, peaks in Sept
Favorable conditions:
Unstable atmosphere
Warm ocean temps
Other names: Typhoon (Pacific Ocean), Willy-willy (Australia)
BBC Hurricane
Animation

12. Photograph courtesy NASA/GSFC

13. Where Hurricanes Form  7 Basins
Makes no sense without caption in book

14. New Orleans
Strong Side
Weak Side

15. Cross Section of a Hurricane
Makes no sense without caption in book
Eye = high-pressure center
Eyewall = circle of strong thunderstorms surrounding eye
Rainbands = arms formed by curved lines of storm clouds

16. Saffir-Simpson Hurricane Scale
Makes no sense without caption in book
Category
Animation

17. Hurricane Hazards Flying debris Tornadoes
A storm surge is water pushed toward the shore by the force of the winds swirling around the storm
Severe flooding
Beach erosion
Causes more damage than winds

18. Write your summary
A few sentences to summarize this set of notes