dolemit3 said: How is it possible to die from a bush fire, can't they see it coming and walk away? or does it spread so fast that you can't outrun it? |
Key factors affecting bushfires
• Fuel: Anything that burns is fuel for the fire: litter on the ground (leaves, twigs, rubbish), undergrowth (shrubs, grass, seedlings), trees and other vegetation, structures (such as houses) and any other miscellaneous objects in the vicinity; gas bottles, piles of firewood, tyres, etc. Ladder fuels are low growing (30 cm to 2 meters) vegetation that offers a ladder for the fire to rise to the canopies of trees.
• Weather: Weather is a major contributor to bushfires. The hotter and dryer, the more likely it is for a bushfire to start and spread uncontrollably. High winds will reduce humidity, and cause an ongoing bushfire to spread more rapidly. Most bushfires start in the afternoon, when it is driest and hottest.
• Topography/slope: The topography of the terrain is a major factor in bushfire behaviour. Generally the fire spreads faster uphill. Conversely, fire going downhill advances more slowly. The superheated air is pushed in front of the fire drying and pre-warming the fuel for ignition. When a fire progressing downhill hits the flat at the bottom of the hill, the height of the flame can quadruple, when the fire hits the undulating slope opposite, the height may quadruple again. In other words, 1 metre flames going downhill can turn into 4 metre flames at the bottom of the hill, and to 16 metre flames starting to climb the next hill. While the height of the flame depends mainly on the height of the fuel, the former stands as a reminder that an innocent looking small bushfire can rapidly change into a life threatening fire.
It was very windy so the embers spread fast and very far quickly. People also thought it wasn't as bad as its turned out to be. Alot had stayed too long and couldnt leave in time or they got killed in their cars when leaving.
Also there were alot of small fires all over the place, multiple fronts coming from different directions.
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