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    Hurricanes: What You Need to Know
    Hurricanes: What You Need to Know
    Hurricanes: What You Need to Know
    Ebook172 pages1 hour

    Hurricanes: What You Need to Know

    By Rebecca Leaman

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    About this ebook

    In 1954 Hurricane Hazel caused such destruction around Lake Ontario that it's a vivid memory half a century later. In 2003 Hurricane Juan so devastated the Halifax, Nova Scotia, area that complete recovery will take decades. In the fall of 2005, Hurricane Katrina, immediately followed by Rita and Wilma, held North America and the world spellbound. In fact, 2005 was a record breaking year for tropical storms, with four Category 5 hurricanes, seven tropical storms before August 1, the strongest hurricane in the Atlantic basin, and the costliest and third deadliest hurricane in US history. Yet few people know more about hurricanes than the horror they witness in the media. What are hurricanes? How are they formed, and where do they get their names? What should you do if a hurricane is headed in your direction? An indispensable reference book, Hurricanes: What You Need to Know answers these questions and more by combining science with handy tips, quick facts, checklists, satellite images, photographs and stories about some of North America's most devastating tropical storms.
    LanguageEnglish
    PublisherGoose Lane Editions
    Release dateSep 30, 2011
    ISBN9780864925756
    Hurricanes: What You Need to Know
    Author

    Rebecca Leaman

    Rebecca Leaman lives in Fredericton and owns her own editorial business.

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      Book preview

      Hurricanes - Rebecca Leaman

      Hurricanes: What You Need to Know

      HURRICANES

      WHAT YOU NEED TO KNOW

      Copyright © Goose Lane Editions, 2006.

      All rights reserved. No part of this work may be reproduced or used in any form or by any means, electronic or mechanical, including photocopying, recording, or any retrieval system, without the prior written permission of the publisher or a licence from the Canadian Copyright Licensing Agency (Access Copyright). To contact Access Copyright, visit www.accesscopyright.ca or call 1-800-893-5777.

      Cover illustration by Corbis.

      Cover and interior design by Lisa Rousseau.

      Compiled and edited by Rebecca Leaman.

      Printed in Canada.

      10   9   8   7   6   5   4   3   2   1

      Library and Archives Canada Cataloguing in Publication

      Hurricanes: what you need to know.

      Includes bibliographical references and index.

      ISBN 0-86492-453-4

      1. Hurricanes. 2. Survival skills.

      QC944.H87 2006 363.34’922         C2006-900415-3

      Published with the financial support of the Canada Council for the Arts, the Government of Canada through the Book Publishing Industry Development Program, and the New Brunswick Culture and Sports Secretariat.

      Goose Lane Editions

      500 Beaverbrook Court

      Fredericton, New Brunswick

      CANADA E3B 5X4

      www.gooselane.com

      CHAPTER ONE - WHAT IS A HURRICANE?

      The Anatomy of a Storm

      The Life Cycle of a Hurricane

      CHAPTER 2 - HURRICANE POWER

      The Saffir-Simpson Scale

      Hurricane Effects

      Factors in Hurricane Damage

      CHAPTER 3 - HURRICANE SEASON

      When Is Hurricane Season?

      2005: A Season to Remember

      The Naming of Storms

      CHAPTER 4 - FORECASTING

      International Cooperation

      Storm Tracking Tools

      CHAPTER 5 - STORM WARNING

      Communication

      Hurricane Watch

      Hurricane Warning

      Other Advisories

      Information Sources

      Storm Summaries

      CHAPTER 6 - HURRICANE PREPAREDNESS

      Identify the Risks

      Family Emergency Plan

      Other Emergency Plans

      Prepare Your Home

      Prepare Yourself

      Prepare Your Pets and Livestock

      Emergency Kits

      Practice Your Plan

      Your Community

      CHAPTER 7 - BATTEN DOWN THE HATCHES

      Strengthening Your Home

      Hurricane Watch

      CHAPTER 8 - DURING THE STORM

      Hurricanes

      Tornadoes

      Flooding

      Downed Power Lines

      Power Outages

      Danger: Carbon Monoxide

      Safe Evacuation

      CHAPTER 9 - AFTER THE STORM

      What to Expect

      After the Storm Has Passed

      Returning Home

      Keep Food Safe

      Keep Water Safe

      CHAPTER 10 - CLEANUP AND RECOVERY

      First Steps

      Cleanup Safety Tips

      Keep or Discard

      Dry Out Your Home

      Before Moving Back In

      The Road to Recovery

      Checklists

      First Aid Kit

      Emergency Kit

      Additional Householding Emergency Items

      Vehicle Emergency Kit

      Workplace Emergency Kit

      Important Documents

      Glossary

      Resources

      Index to Hurricanes

      Acknowledgements

      WHAT IS A HURRICANE?

      The Anatomy of a Storm

      A tropical cyclone is an almost circular storm of extremely low pressure and high winds that spiral inward, accompanied by heavy rainfall. There are three types of tropical cyclones: tropical depressions, tropical storms, and hurricanes, which are the most intense and dangerous.

      Hurricanes have three distinctive parts: the eye, the eye wall, and spiral rain bands.

      The Eye

      One of the most familiar parts of a tropical cyclone is the eye, produced by the intense spiraling of the storm. It is the region where the surface pressure is lowest and the temperature aloft is warmest, and the air in it is slowly sinking. The eye is the innermost zone of the tropical cyclone, but it is not always in the center of the storm. Sometimes it turns or moves in various directions with the storm itself, which continues to move forward on its own course.

      The eye is surprisingly calm, with little or no wind. Within it, the skies are often clear, despite the fact that winds and clouds continue to rage around the edge of the eye. As the eye passes over a site, the sky clears and calm prevails. Then, the storm strikes again with high winds from the opposite direction.

      The eye of a hurricane. U.S. Air Force

      The Eye Wall

      The eye of a tropical cyclone is surrounded by a ring of thunderstorms called the eye wall. The heaviest rain, strongest winds, and worst turbulence are normally in the eye wall. The mechanisms by which the eye and the eye wall are formed are not well understood, but it is generally thought that the feature is a fundamental component of all rotating fluids.

      Spiral Rain Bands

      Hurricanes are surrounded by bands of heavy convective showers that spiral inward toward the storm’s center. Cumulus and cumulonimbus (thunderstorm) clouds rise, and lightning develops in the spiral rain bands at the hurricane’s edge.

      The upper eye wall of Hurricane Katrina, captured from a NOAA Hurricane Hunter aircraft over the Gulf of Mexico. The day before making landfall on August 28, 2005, Katrina was a strong Category 4 storm, and the eye was approximately 48 km (30 miles) in diameter. Note the spiral banding in the eye wall clouds and the clear sky above the eye. NOAA

      The Life Cycle of a Hurricane

      Origin

      Many hurricanes that strike North America form in the tropical waters of the Atlantic Ocean or Caribbean Sea, move on a westerly to northerly track, steered by the prevailing wind direction, and strike the mainland on either the Gulf or Atlantic coast.

      Hurricanes develop only in certain areas of the earth. Climatologists have defined seven regions of tropical storm formation: the western north Pacific, the eastern north Pacific, the Atlantic, the southwest Indian Ocean, the north Indian Ocean, and two areas off Australia: the southeast Indian Ocean and the southwest Pacific Ocean. The shape of the south Atlantic Ocean basin does not allow storm clouds from Africa enough time over warm water to develop into cyclones, and the waters of the eastern south Pacific are simply too cold for hurricane formation.

      In order for tropical cyclones to form, several environmental conditions must be present:

      • The cyclone must originate over ocean water that is least 26.5°C (80°F). Hurricanes draw their energy from the warm water of the tropics and the latent heat of condensation.

      • The atmosphere must quickly become cooler as the altitude increases. This condition creates instability. If the air is unstable, the warm surface air will continue rising. If winds at all levels of the atmosphere are blowing at the same speed and from the same direction, the disturbance will grow.

      • Cyclones form no closer to the equator than approximately 500 kilometres (300 miles). This is because of the Coriolis Force, an effect caused by the turning of the earth, which starts the cyclone spiral and maintains the low pressure of the disturbance. Close to the equator, the Coriolis Force is too weak.

      • An upper atmosphere high-pressure area above the growing storm should be present. The air in such high-pressure areas flows outward, pushing away the air that is rising in the storm and drawing even more air up from the low levels.

      The Growth of a Hurricane

      A hurricane progresses through a series of stages from birth to dissipation. First, it begins as a tropical disturbance: a large area of organized thunderstorms that maintain their identity for more than 24 hours.

      If the area of thunderstorms organizes so that a definite rotation develops and winds become strong, the system is upgraded to a tropical depression. At this point, a low-pressure center exists and the

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