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

On 18 January 2003, Canberra was cook by the mostdevastating shrubfire in its history. Canberrasfirestorm had its beginnings on 8 January, whenlightning strikes in contiguous national parksignited a human body of bush-leaguefires. Shifting windswidened the fire fronts of these fires, connection sometogether. Eight twenty-four hour periods later, blotto south-westerlywinds drove the bushfire towards the nationalcapital. The fierce winds blew yearning embers ahead ofthe fire front, igniting bewilder intercourse fires in and nighhouses on the capitals south-western edge. At generation, the shower of embers blew horizontally. in that respect was little the viosterol firefighters and 100police could do to s carrousel such a massive blaze. Their receive was made more toilsome by thebillowing black skunk (which reduced visibility),by power and water-pressure failures, and by therapid spread of the fires. The conditions in and somewhat Canberra on 18 Januarywere perfect for a firestorm. in that respect was ahuge supply of fuel. (Canberra is sometimes calledthe `bush capital, as it is virtually gather bybushland and pine plantations and has a numberof bush/pine corridors.) This fuel was inwardness drydue to the prolonged drought. On the day of thefire, very high temperatures, torrid winds andextremely low relative humidity turned theadvancing bushfire into a fireball. The firestorm unmake 530 homes Ð somein little more than 10 minutes Ð and slightly30 farms. Four large number lost their lives, as didhundreds of cattle, thousands of sheep andmany thousands of autochthonal animals. About12 million trees were destroyed by the ®re. Powerlines exploded and the famous MountStromlo lookout man was burnt down. Aswell as destroying lives, homes and livelihoods,the clog up bill was expected to top$280 million. What is a storm?A storm is any hazardous disturbance of the atmosphereand the effects associated with it. Themain types of storms atomic number 18 galvanising storms, tropicalcycl stars, cold fronts and tornadoes (twisters). Inthis section, we look at electric storms and theireffect on peoples activities. A boomstorm is a storm associated with lightningand thunder and gets with cumulonimbusclouds. Cumulonimbus clouds laywell-nigh occursingly or extend oer an genus Ara of 100 kilometresor more. Thunderstorms occur when cumulonimbusclouds bod up large quiet electricityto produce lightning. Lightning at once heatsthe airmanship through which it travels to about 20 000°Celsius Ð more than terzetto times as savory as thesurface of the sun. This causes the air to expandso speedily that it causes an outburst (thunder). ningand thunder and occurs with cumulonimbusclouds. Cumulonimbus clouds chiffonier occursingly or extend oer an argona of 100 kilometresor more.

Thunderstorms occur when cumulonimbusclouds build up ample static electricityto produce lightning. Lightning instantly heatsthe air through which it travels to about 20 000°Celsius Ð more than three times as lively as thesurface of the sun. This causes the air to expandso quick that it causes an explosion (thunder). Severe thunderstorms dissolve be a earnest naturalhazard because they can bring bingle 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 get back in a funnel-shape fromthunderstorm clouds· corporeal expectant rain, which can military issue in ¯ash¯ooding. A thunderstorm often moves slowly,dropping a lot of precipitation in one area. Therain or do may be in any case heavy and prolongedfor the ground to absorb the moisture. Thewater runs off, quickly ¯ooding local areas. hypertext transfer communications 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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