Kathryn Silveira
Brooke Strumlauf
Le Boy
Geology Period 3
14 May 2015
Super Storms: Hurricanes Hurricanes are severe tropical cyclones that have winds greater than 74 miles per hour (120 km/h). Hurricanes form in all of Earth’s tropical oceans except in the cool waters of the South Atlantic Ocean and the South Pacific. To form hurricanes need an abundant supply of very warm ocean water and a disturbance to lift the warm air up and keep it rising. In order to become a hurricane the storm must go through a series of stages. A tropical disturbance, the first stage of a tropical cyclone can originate from the Intertropical Convergence Zone or as weak low-pressure system. Only a small group of disturbances develop into full-scale hurricanes. Tropical Depression, the second
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Depressions have winds less than 65 km/h and when winds exceed that the depression becomes a tropical storm. Once winds reach 120 km/h (74 mph), the tropical storm is officially classified as a hurricane. Hurricanes are classified into categories 1-5; the scale that classifies hurricanes is called the Saffir-Simpson hurricane scale. Three major hurricanes we will be focusing on are Hurricane Andrew, Hurricane Katrina, and Hurricane Sandy. Hurricane Andrew was the result of a tropical wave that moved off the western cost of Africa. On August 22, 1992, Andrew became a hurricane and the next day was categorized at a 4. The hurricane weakened as it passed over the Bahamas but then intensified as it moved over the Gulfstream on the way to Florida. Hurricane Andrew hit Dade County on August 24th as Category 5. Andrew then moved into south-central Louisiana as a weakened Category 3.
In 1992, hurricane Andrew was a category four hurricane and said to be one of the worst natural disasters to happen in the United States at the time. It’s winds surpassed 160 miles per hour and caused damage to over 125,000 homes within 400 square miles. Hurricane Andrew left approximately 175,000 families and children temporarily homeless.
On August 24th, 1992 in the state of Florida, complete destruction was the end result of Hurricane Andrew. A Hurricane that began in the Atlantic ocean at 20mph. That is almost twice the strength that normal hurricanes begin at. The peak strength of Hurricane Andrew was so strong that devices were not able to measure the winds. An approximation of the force of the winds was said to be up to 200mph. Andrew destroyed about 28,000 homes, damaged 100,000 homes and left 250,000 people homeless along with 30 billion dollars in damage and almost 30 deaths. Hurricane Andrew did not end its devastation in Florida, soon it went to Louisiana causing more damage. (Fig.1)
Imagine a family sitting at home watching a calm game of baseball, when suddenly they realize that a massive wall of water is approaching the neighborhood. Where did this flash flood come from, a reader might ask? The wall of water was made by the raging winds and immense power of Hurricane Andrew. Hurricane Andrew was the second most expensive storm in history that destroyed over 250,000 homes in the states of Florida and Louisiana alone. Hurricane Andrew was not predicted to make landfall, so when it did many civilians did not have any idea that the Hurricane was coming until it was almost too late.
Hurricanes are born over the warm waters of tropical oceans and are formed by a low-pressure system caused by the heating of water. The heat causes the air to rise and form lower pressures in a feedback loop, making the hurricane stronger. Heavy rain results from a condensation of water and strong winds develop from warm air rushing to the eye of the hurricane. Essentially, greater storms and winds occur when the hurricane feeds of the rising temperature of the water. In addition, researchers studied disturbances and intense thunderstorms in the atmosphere over Western Africa and believe they are partly to blame for extreme hurricanes affecting the United States and Canada. While these are all the main ingredients of a perfectly natural process, they were not the primary causes of the damage done by Hurricane
On August 29, 2005, the third strongest and biggest hurricane ever recorded in American history hit the Gulf Coast at eight o’clock a.m. The interaction between a tropical depression and a tropical wave created a tropical storm later referred to as Hurricane Katrina (FAQS, 2013). Forming over the Bahamas, Hurricane Katrina gradually strengthened as it moved closer and closer to the Gulf of Mexico. Recorded on August 28th, 2005, Katrina jumped from a category three storm to a category five storm with maximum sustained winds up to 160 miles per hour. Although other hurricanes, such as Hurricane Rita and Hurricane Wilma, exceeded Katrina, this dominant storm was classified as the fourth most intense hurricane based its pressure capacity. Once Hurricane Katrina hit land, it was pronounced as a category four storm moving slowly. While people thought that the slow speed of this storm prevented trauma, records show that Katrina did more damage than any fast-moving storm could have ever achieved (Solanki, 2013). Katrina produced abundant debris. The debris was in such large quantity that if it was stacked together on a football field, the rubble would reach the elevation of ten and a half miles. The size of Katrina also caused 90,000 square miles to be affected. Once proclaimed a category three storm, Hurricane Katrina slowed to the speed of 155 miles per hour. At this point in time, Katrina proved to be the sixth most prevailing hurricane traced in history. (Solanki, 2013). Several different aspects of life were impacted by Hurricane Katrina such as availability of gasoline, economic issues, and the ability to have an adequate supply of drinking water (Solanki, 2013). Hurricane Katrina was a large storm ...
A hurricane is a low pressure area that forms over a warm ocean in the early summer and in the early fall and. the two biggest factors of causes of a hurricane is water and moist air because the water surface rises and then gets mixed with cooler air to condense and form storm clouds. When a hurricane starts in the Atlantic it starts when a thunderstorm off the west coast of Africa drifts up towards the Atlantic. A minimum distance of at least 500km, from the equator, is needed because it is too humid near the equator for a hurricane to start.so that’s why hurricanes form above the equator it where it’s cooler. Wherever the hurricane forms (on the water) it needs to be at least 80 degrees Fahrenheit (the water), that’s how you get water vapor which, because the water is warm, which powers the hurricane (the water vapor releases latent heat of condensation to power the hurricane).the water vapor acts like a fuel source. Strong winds also play a big role in causing a hurricane because it helps bring up more water vapor. These winds also spiral inwards so the hurricane canes get its spiraling motion. Th...
Hurricane Katrina began its formation above the tropical oceans of the Bahamas. As it traveled to Florida, Katrina became classified as a tropical storm, and then a category one hurricane. With its southwestern path, Hurricane Katrina raged to the east portion of...
The birth of a hurricane requires at least three conditions. First, the ocean waters must be warm enough at the surface to put enough heat and moisture into the overlying atmosphere to provide the potential fuel for the thermodynamic engine that a hurricane becomes. Second, atmospheric moisture from seawater evaporation must combine with that heat and energy to form the powerful engine needed to propel a hurricane. Third, a wind pattern must be near the ocean surface to spirals air inward. At least 3 conditions must be present for a hurricane to emerge. Water, heat, and wind are the three main factors that have to be in perfect conditions to start a hurricane. (The Weather Channel, 2008)
Hurricanes form over the ocean. Easterly waves, what hurricanes develop from, are long, narrow regions of low pressure which occur in ocean winds called trade winds. At first, these easterly waves can grow into something called, a tropical depression. A tropical depression occurs when winds are up to 31 mph. Then tropical depressions can be upgraded into a tropical storm if the winds reach speeds of 74 mph or less. Then finally a the storm can be bumped up into a hurricane if the winds reach 75 mph.
The United States of America has dealt with many hurricanes that have cost a great amount of damage. However, there is one hurricane that happened in 2005 that stands out among the others, Hurricane Katrina. Hurricane Katrina was one of the worst hurricanes to hit the United States, a category 5 on the Saffir/Simpson Hurricane Scale. An estimated 1836 people died because of the hurricane and the flooding that happened after (Zimmermann 1). Katrina initially began forming over the Bahamas on August 23rd, as a tropical depression....
These same tropical storms are known as cyclones in the northern Indian Ocean and Bay of Bengal, and as typhoons in the western Pacific Ocean. The Atlantic Ocean’s hurricane season points from mid-August to late October and averages five to six hurricanes each year. Hurricanes begin as tropical disturbances in warm ocean waters with temperatures of at least 80 degrees Fahrenheit. These low pressure systems are served by energy from the warm seas. If a storm reaches wind speeds of 38 miles an hour, it is known as a tropical depression. A tropical depression becomes a tropical storm, and is given a name, when its sustained wind speeds top 39 miles an hour. When a storm’s sustained wind speeds reach 74 miles an hour it becomes a hurricane and earns a category rating of 1 to 5 on the Saffir-Simpson scale. Hurricanes are enormous heat engines that generate energy on a staggering scale. They draw heat from warm, moist ocean air and release it through condensation of water vapor in thunderstorms. A current hurricane that occurred was Big Sandy. FEMA became involved with the issue when the hurricane hit Rockaway, New York. President Obama declared a major disaster on October 30, 2012. According to what President Obama said, “We're going to have a lot of work to do. I don't want anybody to feel that somehow this is all going to get cleaned up overnight. We want to make sure that people have realistic expectations. You know, we go through tough times, but we bounce back. And the reason we bounce back is because we look out for one another and we don't leave anybody behind. And so my commitment to the people on this block, the people in this community, and the people of this state is that that same spirit will carry over all the way through until our work is done. In this country, we look out for one another.
Hurricanes originate as tropical disturbances over warm oceans with trade winds. The tropical turbances intensify into tropical depressions, and eventually into a tropical storm. They only originate in the tropical trade winds because the ocean temperatures are quite warm there. Powered from the heat that the sea gives off, they are steered by the east trade winds and the temperate west ones, as well as by their own ferocious energy. Around their core, winds grow with a tremendous amount of velocity creating violent seas. As they move toward the shore, they move the ocean inward, while spawning tornadoes and producing torrential rains and floods.
A tropical cyclone is a warm-core, low-pressure system producing high winds that spiral counter-clockwise (in the northern hemisphere) and inward, with the highest winds near the center of circulation. The large counter-clockwise and inward flow is characteristic of the nearly symmetric structure of tropical cyclones as they are comprised of rain bands spiraling toward the center. These warm-core storms typically form over the tropical and subtropical oceans and extract their energy from the heat content of the oceans. Tropical cyclones are organized into three main states, depending on their overall structure and maximum wind speed. The three main categories are: Tropical Depression • Closed low-pressure system • Winds must rotate fully around the closed low-pressure center • Maximum sustained winds of up to 39 mph Tropical Storm • Appear more circular than a Tropical Depression, indicating more organization • Clearly recognizable rotation • Maximum sustained winds from 39 to 73 mph Hurricane • Well-organized, often with a distinct eye • Pronounced, strong rotation • Maximum sustained winds greater than 73 mph • Large range in intensity is described by the Saffir-Simpson Scale
Hurricanes occur all over the world, at different times, but commonly through June first and late November. However in late August 2005 a catastrophic hurricane struck. This was Hurricane Katrina. With winds traveling over one hundred miles per hour making it a category five on the Saffir- Simpson Hurricane Scale it was said to have cause billions of dollars’ worth of damage. Hurricane Katrina flooded nearly forty thousand homes, and killed at least two thousand people (“Hurricane”). An average category five hurricane has enough energy to power street lamps for more than twenty seven thousand hours (Williams 58). Knowing about Hurricane Katrina, and the devastation of the city in New Orleans would be beneficial. Also, general information on hurricanes can help civilians and people of higher authority better understand and prepare for damage that could once hit their town and community. Because experts know the general information on these storms they can help explain to the public why and how Hurricane Katrina and other hurricanes occur. Hopefully, in the future civilians will know and use this information to their advantage against hurricanes.