1. Storms  Unit 5
Earth Science

2. Severe Weather Safety Watches- conditions are favorable
Warnings- conditions already exist
Examples- Tornadoes, Flooding, Thunderstorms, Blizzards, Winter Mixes and Hurricanes

3. How Thunderstorms Form
For a thunderstorm to form, three conditions must exist.
Thunder, Lightning, Rain, High Winds
Possibly Hail, Tornadoes
1. There must be an abundant source of moisture in the lower levels of the atmosphere.
2. Some mechanism must lift the air so that the moisture can condense.
The portion of the atmosphere through which the cloud grows must be unstable.

4. Thunderstorms
Earth Science

5. Lightning and Thunder
Lightning – discharge of electricity from a t-cloud to ground, to another cloud, or from the ground to a cloud
Extremely high temp., air expands explosively – causes thunder
Light travels faster than sound – causes delay between lightning and thunder
Thunder can be heard up to 16 km
Mr. Ertl
Earth Science

6. Lightning

7. Lightning

8. Tornadoes
Narrow, funnel shaped-column of spiral winds that extends downward from cloud
Occur more frequent in US than anywhere else
Mississippi River Valley and Great Plains
Grow out of T-Storms, produced when cold, dry air meets warm, moist air
Winds between km/hour
Usually travel SW to NE
Mr. Ertl
Earth Science

9. Intensity measure on Fujita Scale
The scale ranges from F0, which is characterized by winds of up to 118 km/h, to the violent F5, which can pack winds of more than 500 km/h.
Mr. Ertl
Earth Science

10. Earth Science

11. Tornadoes

13. Storm Surges

14. Formation of Hurricanes
Hurricane seasons starts June 1 – November 30
A tropical disturbance forms.
Has to form near the equator over water.
The warm air rises and cool to form clouds.
Forms large intense low pressure system.
Winds reach 23 mph tropical depression
Winds reach 39 mph  tropical storm
Receives a name
Winds reach 74 mph  hurricane

15. How to Name a Hurricane
Each time a storm reaches tropical storm status it receives a name.
Name are picking from a list in alphabetical order.

16. Classifying a Hurricane
Use the Saffir- Simpson Scale
Based on a 1-5 scale.
1 being the least amount of damage.
5 the most amount of damage.

17. Saffir- Simpson Scale

18. Hurricane Hazards
Hurricane Advisories

19. Mr. Ertl
Science 8 19

20. Then came Katrina…

21. …a strong category 3 hurricane when it struck New Orleans.

22. Compare satellite images before and during the flood
Compare satellite images before and during the flood. (Dark blue is water.)