An essay on Natural Hazard; Storms and Black Saturday, Canberra, 2003

On 18 January 2003, Canberra was correspond by the mostdevastating scrubbingfire in its history. Canberrasfirestorm had its beginnings on 8 January, whenlightning strikes in conterminous national parksignited a count on of chaparralfires. Shifting windswidened the fire fronts of these fires, connective sometogether. Eight day generation later, untouchable south-westerlywinds drove the bushfire towards the nationalcapital. The fierce winds blew yearning embers ahead ofthe fire front, igniting apply intercourse fires in and nighhouses on the capitals south-western edge. At times, the shower of embers blew horizontally. in that respect was little the cholecalciferol firefighters and 100police could do to s crystalize such(prenominal) a massive blaze. Their constitute was made more uncontrollable by thebillowing black sens (which reduced visibility),by power and water-pressure failures, and by therapid spread of the fires. The conditions in and near Canberra on 18 Januarywere perfect for a firestorm. thither was ahuge supply of fuel. (Canberra is sometimes calledthe `bush capital, as it is virtually concern bybushland and pine plantations and has a numberof bush/pine corridors.) This fuel was essence drydue to the prolonged drought. On the day of thefire, very high temperatures, flaming winds andextremely low relative humidity turned theadvancing bushfire into a fireball. The firestorm loosen 530 homes Ð somein little more than 10 minutes Ð and slightly30 farms. Four jam lost their lives, as didhundreds of cattle, thousands of sheep andmany thousands of innate animals. About12 million trees were destroyed by the ®re. Powerlines exploded and the famous MountStromlo sentry was burnt down. Aswell as destroying lives, homes and livelihoods,the abuse bill was expected to top$280 million. What is a storm?A storm is any cerise disturbance of the atmosphereand the effects associated with it. Themain types of storms atomic number 18 galvanic storms, tropicalcycl stars, cold fronts and tornadoes (twisters). Inthis section, we look at blaststorms and theireffect on peoples activities. A thunderstorm is a storm associated with lightningand thunder and comes with cumulonimbusclouds. Cumulonimbus clouds lay somewhat occursingly or extend oer an genus Ara of 100 kilometresor more. Thunderstorms occur when cumulonimbusclouds phase up large still electricityto produce lightning. Lightning straight off heatsthe air power through which it travels to about 20 000°Celsius Ð more than collar times as savory as thesurface of the sun. This causes the air to expandso promptly that it causes an effusion (thunder). ningand thunder and occurs with cumulonimbusclouds. Cumulonimbus clouds rear end occursingly or extend all over an argona of 100 kilometresor more.

Thunderstorms occur when cumulonimbusclouds build up rich static electricityto produce lightning. Lightning instantly heatsthe air through which it travels to about 20 000°Celsius Ð more than three times as scorching as thesurface of the sun. This causes the air to expandso quickly that it causes an explosion (thunder). Severe thunderstorms go off be a dependable naturalhazard because they can bring one or more of thefollowing features:· Hailstones, which are two centimetres or morein diameter· Wind gusts of 90 kilometres or more per hour· Tornadoes, which are rapidly rotating columnsof air that diminish in a funnel-shape fromthunderstorm clouds· documentary expectant rain, which can subject in ¯ash¯ooding. A thunderstorm often moves slowly,dropping a lot of precipitation in one area. Therain or amount may be in any case heavy and prolongedfor the ground to absorb the moisture. Thewater runs off, quickly ¯ooding local areas. hypertext transfer protocol://members.pcug.org.au/~mdinn/fires/index.htmhttp://www.rmwebed.com.au/geo_2008/canberra.htmlhttp://members.pcug.org.au/~mdinn/fires/index.htmhttp://www.rmwebed.com.au/geo_2008/canberra.html If you want to get a full essay, order it on our website: Ordercustompaper.com

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