Natural DisasterCycloneSakshi MehtaX E15

1IntroductionInmeteorology, acycloneis an area of closed, circular fluid motion rotating in the same direction as theEarth.This is usually characterized by inwardspiralingwindsthat rotatecounterclockwisein theNorthern Hemisphereandclockwisein the Southern Hemisphereof the Earth. Most large-scale cyclonic circulations are centered on areas oflow atmospheric pressure.2What causes cyclones ?The main source of energy for tropical cyclones is the warm oceans in the tropical regions. To initiate a tropical cyclone the sea-surface temperature generally needs to be above 26.5C.The development of a tropical cyclone also relies on favorable broad-scale wind regimes and can persist for several days with many following quite erratic paths. They lose their source of energy when they move over land or colder oceans causing them to dissipate. Sometimes a decaying tropical cyclone may interact with a weather system in higher latitudes to cause impacts far from the tropics.

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Youtube.com\Aftermath, Effects of the cycloneThe main effects oftropical cyclonesinclude heavyrain, strongwind, largestorm surgesatlandfall, andtornadoes.At sea :1) ShipwrecksShipwrecks are common with the passage of strong tropical cyclones.2) ShippingSailors term the right side thedangerous semicirclesince the heaviest rain and strongest winds and seas were located in this half of the storm, as the cyclone's translation speed and its rotational wind are additive.Upon Landfall:The most significant effects of a tropical cyclone occur when they cross coastlines, makinglandfall.1) Strong windsStrongwindscan damage or destroy vehicles, buildings, bridges, personal property and other outside objects, turning loose debris into deadly flying projectiles.

2) Storm surge (increase in sea level)

3) Heavy rainfall

4) Tornadoes

Reconstruction, repopulation and natural resourcesWhile tropical cyclones may well seriously damage settlement, total destruction encourages rebuilding.Research indicates that the typical hurricane strike raises real house prices for a number of years, with a maximum effect of between 3 percent to 4 percent three years after occurrence.In isolated areas with small populations, tropical cyclones may cause enough casualties to contribute to thefounder's effectas survivors repopulate their place.Tropical cyclones reshape thegeologynear the coast by eroding sand from thebeachas well as offshore, rearranging coral, and changing dune configuration onshore. Their rain water gets absorbed intostalagmiteswithin caves, creating a record of past tropical cyclone impacts.

Cyclone OlwynRole of government and communityGovernment agencies play a critical role during times of disaster, but the exact role of government is often unclear to disaster victims. Even more difficult to decipher are the complex relationships between various government programs, from local to national levels. This document will attempt to make the roles and relationships a little more understandable.Types of AssistanceIndividual Assistance For individuals, families, farmers, and businesses, in the form of loans, grants, emergency housing, tax relief and unemployment assistance. Public Assistance Funds for states, local communities and nonprofit groups to restore public systems and facilities. Matching Mitigation Funds For states and local communities, for projects which eliminate or reduce an area's vulnerability to a hazard.The Role of Communications Technology During Natural Disasters -

2007- Apple reinvents the phone

Communication technology serves as a early warning and prediction system in times of natural disasters. They help to warn the public resulting in early evacuation of the people saving life of many.It is the fastest way we have to communicate and arrange supply of resources to the affected areas.Todays state-of-the-art technology makes technology a important tool in times of natural disaster.