Task
While students are doing their Internet research, they will try to answer the set of questions given. Each web site has some of the answers to the questions, but several of the questions require information from two or more of the web sites. Students should be able to compile information to answer the questions as they read through each web site. Several of the web sites listed have comprehensive information about hurricanes. However, students should be encouraged to look at different web sites, even if they think they have already answered most of the questions from just two or three web sites.

Objectives
Define the following terms: hurricane, typhoon, tropical cyclone, tropical depression, and tropical storm.

Identify the environmental conditions that give rise to tropical cyclones.

List and describe the parts of a hurricane.

Research the scale used to classify hurricanes and identify the most destructive hurricanes of the last 100 years.

Resources

Students will use the Internet links given to find out all about hurricanes. 

Students should be able to produce a presentation with a presentation software. Group work on this project is encouraged. The team should have at least one student who can work the presentation software. Students can also take an online tutorial about " PowerPoint".

Process
As students progress through the list of web sites, you may help them to focus on what they need to know to answer the questions given. Several of the web sites have many links to other web sites. If time allows, you may want to allow students to explore this subject further. Also, encourage the students to take the self assessment.

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Evaluation

Please open the Rubrics for evaluation page

Answers to Questions about Hurricanes!

1. A tropical cyclone is the name for a non-frontal low-pressure system over tropical or subtropical waters with organized convection (thunderstorm activity) and definite cyclonic surface wind circulation. A tropical cyclone may be called a hurricane or a typhoon depending upon its location.
   
   

2. The ocean temperature must be warmer than 26.5ºC (81ºF); the relative humidity must be high; and there must be wind shear (change in the wind speed or direction with increasing altitude).
   
   

3. warm ocean water
   
   

4. The first stage is a tropical depression, when thunderstorms organize and winds near the center are a constant 20-34 knots (23-39 mph). The second stage is a tropical storm, when a tropical depression intensifies, and the maximum sustained winds are 35-64 knots (39-73 mph); at this stage the storm may be given a name and it becomes more organized and circular. The third stage is a hurricane, in which a tropical storm reaches wind speeds of 64 knots (74 mph) and a pronounced rotation develops around the central core of the storm.
   
   

5. the eye, the eye wall, and the spiral rain bands
   
   

6. The Saffir-Simpson scale is a scale that measures the intensity of a hurricane. It extends from a category 1 to a category 5, with 5 being the most intense storm. A category 4 hurricane has winds up to 131-155 mph.
   
   

7. A hurricane can be several hundred miles in diameter; an eye may be 20 miles in diameter.
   
   

8. The worst hurricane in the United States hit Galveston, Texas in August-September, 1900. Approximately 8,000 people died in the storm.
   
   

9. The worst hurricane in the world occurred in Bangladesh in November, 1970. Nearly 300,000 people died in the storm.
   

10. Find the answers on the webpage for the year.
    

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Extensions

Use the hurricane tracking maps if a real hurricane can be tracked.

Ask students if they think that the use of satellite imagery and other modern tools to predict hurricanes has helped to reduce related death and destruction. Talk about the different satellite images and GIS (Geographic information system) and how those modern tools help us to prepare for hurricanes.

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