In an interim report released this week, the commissioners were critical of the six years spent so far to update the country's warning system, saying "work has taken too long and is an example of the need for a clear decision-making process and to elevate matters to national leaders".

This meant confusion when using mobile warning apps.

"While the apps are generally well liked by the community, the inconsistencies and differences in information provided in apps caused some issues during the 2019-20 bushfire season, especially for border communities and tourists who had to use multiple apps," the commissioners said.

"We are considering the value of a national approach to apps that can standardise the process of attributing a warning to an emergency, clarify time lags in publishing warnings, and provide all relevant information an individual may need to make an informed decision in relation to all hazards.

"We are considering the need for a new 'national app' with information about all natural disasters, not just bushfires."

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The commissioners said there was an opportunity to improve evacuation centres, recognising problems with accessing some centres and the need to cater for tourist numbers.

"In some cases, evacuations crossed state and territory borders. In those circumstances, some people may have experienced additional confusion, including due to the differences in terminology used," the report stated.

The final Royal Commission report is due by October 28.