Natural Disasters Reading Notes

Natural Disasters Reading Notes - Natural Disasters Reading...

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Natural Disasters Reading Notes Tropical Cyclone Introduction: Tropical Cyclone: is a warm-core, low pressure system without any "front" attached, that develops over the tropical or subtropical waters, and has an organized circulation. There are several conditions required for these storms to exist: 1. Warm Ocean Water 2. Quick cooling atmosphere 3. Moist air in the troposphere 4. Close to the equator (300 miles) 5. Pre-existing surface disturbance Coriolis Effect: Force that causes the cyclone to spin The seedlings of a tropical storm can come from: Easterly Waves, West African Disturbance Line, Tropical Upper Tropospheric Trough (cold core in upper atmosphere), Old Frontal Boundary (remnants of a polar front). Warm water is one of the most important factors in causing a tropical storm to begin. Therefore once the storm reaches land it quickly weakens because the storm lacks moisture and heat which the ocean provided. Tropical Cyclone Classification Once a tropical cyclone reaches at least 39mph it is classified as a tropical storm. If the maximum winds speeds sustained reach 74mph it is called a hurricane (North Atlantic and Pacific Ocean), Typhoon (Northwest Pacific Ocean), Severe Tropical Cyclone (Southwest Pacific Ocean), Severe Cyclonic Storm (North Indian Ocean), or a Tropical Cyclone (Southwest Indian Ocean). Hurricanes are classified according to wind speed. The Saffir-Simpson Hurricane Wind Scale is a 1-5 rating based on the hurricane's present intensity.
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Parts of a Tropical Storm Eye: The hurricane's center is a relatively calm, generally clear area of sinking air and light winds that usually do not exceed 15 mph and is typically 20-40 miles across. An eye will usually develop when the maximum sustained wind speeds go above 74 mph and is the calmest part of the storm. The Eye Wall: Where the strong wind gets as close as it can is the eye wall. The eye wall consists of a ring of tall thunderstorms that produce heavy rains and usually the strongest winds. Changes in the structure of the eye and eye wall can cause changes in the wind speed, which is an indicator of the storm's intensity Rain Bands: Curved bands of clouds and thunderstorms that trail away from the eye wall in a spiral fashion. These bands are capable of producing heavy bursts of rain and wind, as well as tornadoes.
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This note was uploaded on 03/10/2012 for the course ATOC 181 taught by Professor - during the Fall '06 term at McGill.

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Natural Disasters Reading Notes - Natural Disasters Reading...

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