1. HURRICANES

2. Ingredients: 1. Water temperature 80 °F or more. 2. Surface level low pressure 3. Upper level high pressure. L H

3. Development 1. Tropical Wave: a large, unorganized area of rain. 2. Tropical Depression: a storm spinning counterclockwise with winds <39 mph. –Symbol is: L

4. Development Tropical Storm: a storm spinning counter clockwise with winds between 39 and 73 mph. Symbol:

5. Development Hurricane: a storm spinning counter clockwise with winds > 74 mph. Symbol:

6. Parts of a hurricane

7. Eye – the calm, low pressure center of a hurricane. 5-30 miles wide. Eye wall – the dense wall of thunderstorms surrounding the eye. –The strongest and most intense part of a hurricane.

8. Parts of a hurricane Rain bands – the spiral bands of clouds surrounding the eye wall. –The largest part of a hurricane

11. Storm Surge Storm surge – large surge of water near the coast. This causes the most damage!

12. Saffir Simpson Scale The scale used to measure hurricanes is call the Saffir Simpson Scale. Category 1 is the weakest. Category 5 is the strongest: winds > 155 mph.

13. Saffir Simpson Scale

14. Naming a Hurricane Atlantic tropical storms have been named since 1953. They are currently maintained and updated through a strict procedure by an international committee of the World Meteorological Organization. Six lists are used in rotation. The lists are re- cycled every six years, i.e., the 2011 list will be used again in 2017. The names go in alphabetical order and alternate female, male.

15. Retiring a Hurricane The only time that there is a change in the list is if a storm is so deadly or costly that the future use of its name on a different storm would be inappropriate for reasons of sensitivity. If that occurs, then at an annual meeting by the WMO committee the offending name is stricken from the list and another name is selected to replace it. –Recently retired names included: Igor &Tomas (2010) Gustav, Ike & Paloma (2008) Dean, Felix & Noel (2007) Dennis, Katrina, Rita, Stan & Wilma (2005

16. 2011 Hurricane Names Arlene Bret Cindy Don Emily Franklin Gert Harvey Irene Jose Katia Lee Maria Nate Ophelia Philippe Rina Sean Tammy Vince Whitney

17. Hurricane Katrina – 2005 Category 5 (hit U.S. as a category 4)

18. Only 3 Category 5 hurricanes have ever hit the United States. 1.1935 Florida Keys Labor Day Hurricane 2.1969 Hurricane Camille 3.1992 Hurricane Andrew