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Expect a bushfire warning and you can expect disaster

By Roger Underwood - posted Friday, 4 September 2009

A persistent complaint from victims of the Black Saturday bushfires was that they had “received no warning”. Over and again we heard statements like this: “There was no fire anywhere, but the next thing, we had fire all around us. There was no word of warning, and we never stood a chance.”

This issue has since been highlighted by the Royal Commission in its Interim Report, and is being taken to heart by fire authorities all over Australia. In Western Australia, for example, the Fire and Emergency Service (FESA) has rolled out a new warning arrangement based on mobile phones, and has carried out a substantial and well-publicised test in a Perth Hills suburb. It was said (by FESA) to have been a great success.

This is a delicate subject, because I don’t want to sound disrespectful to people who lost their lives or suffered in the Victorian fires. I realise that many people are perplexed by the way they were engulfed by fire and caught by surprise. I also understand the desire of authorities to get warning systems in place. Officials realise that a failure to deal with this issue in future fires will come back to haunt them if complaints are made to Royal Commissions, Coronial inquiries and the media.


However, the downsides, weaknesses and dangers in bushfire warning systems must be properly understood.

The first problem is that while the behaviour of bushfires burning at low intensity in light fuels is well understood, high intensity fires in heavy fuels can behave erratically. Intense fires generate their own wind and throw spot fires kilometres ahead. This is the main reason people are caught unawares. One minute the fire may well be “miles away”. But the next minute a high wind brings a rain of burning embers. If these fall into heavy dry fuels, people rapidly find themselves enveloped by fire.

High intensity fires will leapfrog across one ridge to another, and then swirl back, sucked into the intervening valleys and seemingly coming from the “wrong direction”. A bushfire can move from a mild ground fire with 1-2 metre flames, to an intense crown fire (throwing spotfires) within a matter of minutes ... it is simply a matter of a wind change turning a long flank into a headfire, or of a fire moving from an area of light to an area of heavy fuels.

Very rapid changes in fire behaviour and mass spotfire generation present a nightmare for people with the job of activating a warning system. Decisions can only be made with very accurate and up-to-date information from the fire. Since the situation at the fire is often confused, and firefighters generally do not have any idea of the big picture, it makes decision-making about whether or when to activate a warning (and to whom) doubly difficult.

A further problem is that rarely do you get one fire at the one time, especially on a bad day. When there is a dry lightning storm, or where an arsonist is at his dirty work, it is not uncommon for several fires to start at about the same time and run parallel with each other. This can confuse efforts at fire detection, mapping, and spread prediction. When many separate fires start to coalesce and interact, fire prediction moves into the realms of the unknown, making it virtually impossible to know who to warn and when, other than in the broadest geographic sense.

Finally, any warning system based on communications technology is likely to break down in a serious bushfire situation. This is especially true of technologies that require mains electricity, which is generally the first to go when there is a fire, or static relay stations like phone towers that can be destroyed by fire or cyclonic winds. To this must be added the well-known problem of communications overload in a crisis situation.


There are two serious dangers with the whole concept of targeted warning systems. The first is that a mass warning will quite possibly lead to a mass evacuation. People leaving the area will choke the roads, and these may well be the same roads on which there are incoming fire appliances. It is not clear to me that the authorities have sufficiently thought this issue through.

The second danger is that the authorities are raising expectations that they may not be able to fulfil. If people are expecting to get, and are waiting for a warning, and the warning does not arrive (for one reason or another), they are going to be set-up for calamity. I hate the idea of community and individual self-reliance being undermined.

To be effective and reliable, a bushfire warning system must meet a number of criteria. It must have access to accurate data on fire location, fuels and weather, together with the fire behaviour algorithms that can predict fire frontal development. It must be able to anticipate wind changes and instantly take on board new information from a fire where long-distance spotting is occurring. It must be flexible in responding to rapidly changing human as well as bushfire situations. There must be back-up in the event of a technological failure. Above all it must have a large and well-trained human resource to make everything work under extreme pressure, including very experienced and accountable decision-makers.

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First published on Jennifer Marohasy's blog on August 31, 2009.

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About the Author

Roger Underwood is a former General Manager of CALM in Western Australia, a regional and district manager, a research manager and bushfire specialist. Roger currently directs a consultancy practice with a focus on bushfire management. He lives in Perth, Western Australia.

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