Hurricane Recipe. Hurricanes

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1 Hurricanes A hurricane is a powerful, rotating storm that forms over warm oceans near the Equator. Hurricanes have strong, rotating winds (at least 74 miles per hour), a huge amount of rain, low air pressure, thunder and lightning. The winds of a hurricane rotate in a counterclockwise direction around a central, calm eye. If this type of storm forms in the western Pacific Ocean, it is called a typhoon. Hurricanes are also called tropical cyclones. Hurricane Recipe Hurricanes need four conditions to form: 1) warm ocean water (over 80ºF) 2) low air pressure which makes air rise upward 3) moist ocean air to create humidity to make clouds and rain 4) light tropical winds to move the hurricane, but not so strong to break it apart Hurricanes typically form at a latitude between 8 degrees and 20 degrees North.

2 Hurricane Formation the Stages 1) Numerous thunderstorms develop over warm ocean water in summer, often in clusters. If the storms merge into one low pressure complex, it is called a tropical wave, which moves west with the trade winds. 2) As the warm, moist air over the ocean rises in the low air pressure area, cold air from above replaces it. This produces strong gusty winds, heavy rain and thunderclouds that is called a tropical disturbance. Hurricane Formation 3) As the air pressure drops and there are sustained winds up to 38 miles per hour, it is called a tropical depression. 4) When the winds have sustained speeds from 39 to 73 miles per hour, it is called a tropical storm (storms are given names when they begin to have winds of this speed).

3 Hurricane Formation 5) The storm becomes a hurricane when there are sustained winds of over 73 miles per hour. 6) The End of a Storm: When a hurricane travels over land or cold water, its energy source (warm water) is gone and the storm weakens, quickly dying. Hurricane formation Hurricane Parts 1) The center of the hurricane is the eye, which is about miles wide. The eye is relatively calm, with little to no rain, and roughly circular. The eye is the warmest part of the storm and an area of low pressure. The lower the pressure, the stronger the hurricane. 2) Surrounding the eye is the eyewall, a wall of thunderclouds. The eyewall has the most rain and the strongest winds of the storm, gusting up to 225 mph in severe storms. The smaller the eye, the stronger the winds. 3) Long bands of rain clouds appear to spiral inward to the eyewall these are called spiral rainbands. The spiral rainbands can stretch hundreds of miles across.

4 Hurricane Dangers Hurricanes deliver massive amounts of rain. A particularly large storm can dump dozens of inches of rain in just a day or two, much of it inland. That amount of rain can create flooding, especially in the path of the hurricane's center. In addition, high sustained winds within the storm can cause widespread structural damage. These winds can roll over vehicles, collapse walls and blow over trees. Also, the winds of a hurricane push a wall of water called a storm surge, in front of it. If the storm surge happens at the same time as high tide it causes beach erosion and significant inland flooding. Storm Surge Hurricane Dangers The storm's winds often spawn tornadoes, which can cause additional damage.

5 More About Hurricanes Hurricane Names Hurricanes are given women's and men's names to help keep track if there is more than storm at a time (since a hurricane can last for over a week.) The letters of the alphabet are used, except for Q, U, X, Y, and Z. Names are retired if the storm is so deadly or so costly that future use would "be inappropriate for reasons of sensitivity." For example, in 2005: Dennis, Katrina, Rita, Stan, and Wilma were all retired. If all the letters in the alphabet are used, then Greek letters are used as names. (Alpha, Beta, Gamma, etc.) (This happened in 2005). Hurricane Categories Hurricanes are classified into five categories based on their current maximum wind speed. This rating scale is called the Saffir Simpson Hurricane Scale. Category 1 Winds mph Category 2 Winds mph Category 3 Winds mph Category 4 Winds mph Category 5 Winds over 155 mph (these are rare) Hurricane Name List Hurricane Categories Storm Surge by Category Hurricane Safety Hurricane watches and warnings are issued by the National Hurricane Center when a hurricane gets close to land. A hurricane watch means that a hurricane is possible within 36 hours in a given area. A hurricane warning means that a hurricane is expected within 24 hours in a given area. If a very bad storm looks as though it is approaching a low lying area, officials will tell residents to evacuate to a shelter (this is to avoid possible flooding caused by storm surges. Hurricane season in the Atlantic Ocean is from June 1 until November 30. In the eastern Pacific Ocean, hurricane season is from May 15 until November 30.

6 Hurricanes Create a Cane Hurricane Tracking The exact location of a hurricane can be tracked by scientists, but the direction, speed, and intensity of a storm can change quickly. Predicting exactly where a storm will travel in the future is not easy. Weather forecasters can warn people long in advance that a tropical storm may be approaching, but a storm can suddenly change course. The path of a storm is tracked using satellite photos and RADAR. You can plot the latitude and longitude of the center of the storm as the hurricane travels (lines of latitude run east and west; lines of longitude run north and south). The coordinates of a storm's location look like (20ºN, 75ºW), where the first coordinate is the current latitude of the storm and the second coordinate is the longitude. The weather symbol for a hurricane is. The weather symbol for a tropical storm is.

7 How to Track a Hurricane: To plot each location of the storm over time, do the following: 1) Determine the latitude of the storm, the first coordinate in the pair, and locate it on the map (usually followed by an N or S). Latitude measures how far north or south a location is from the Equator (on a map, lines of latitude run east and west). 2) Determine the longitude, the second coordinate in the pair (usually followed by a W or E), and locate it on the map. Longitude measures how far east or west a location is from the Prime Meridian (on a map, lines of longitude run north and south). 3) Draw a (for a hurricane) or a (for a tropical storm) on the weather map. Repeat steps 1 to 3 using the next tracked location of the storm. How to plot a particular hurricane's location: To plot a hurricane located at the point (20ºN, 75ºW), do the following. First locate the 20ºN latitude line on the map (it is highlighted in red). Then locate the 75ºW longitude line on the map (it is highlighted in green). The storm's location is the intersection of these two lines. Plot the storm's location on the map at that point (over eastern Cuba in this example).

8 45 o 40 o 35 o 30 o 25 o 20 o 75o 70 o 65 o 60 o 15 o 10 o 100 o 95 o 90 o 85 o 80 o Hurricane Coordinates 55 o 50 o 45 o 40 o

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