22 oct. 2013

Abnormal 'Fire Cloud' forming over Australian bush fires

Abnormal 'Fire Cloud' forming over Australian bush fires

The fires currently searing through the Australian bush between Lithgow and Bilpin could create an unusual cloud formation known as a 'Fire Cloud' or pyrocumulus, predict fire analysts. The unique weather phenomenon only forms when areas of intense heat, such as bush fires or volcanoes, meet with an unstable atmosphere.

As fires burn, the hot air generated rises in a huge column upwards, with the space underneath being filled by cooler air, a process producing a convection column. The hot-air columns created can be extremely large and can rise high into the atmosphere carrying a large amounts of water vapour - one of the main combustion products of fire.

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