Where is the Bureau of Meteorology's new supercomputer?

Summer is a time of extreme weather events, when Australians turn to the Bureau of Meteorology (BoM) for all important forecasts.

Now, the national weather provider has a new weapon to help make those forecasts even more accurate and long-range.

But the multi-million dollar saga of the Australis II Supercomputer is a situation no-one could have forecast.

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The government first budgeted $59 million for the Australis II in 2015.

After a cyber attack that year, the Bureau decided that before Australis II came online, a cyber security program called ROBUST, would be put in place. 

ROBUST has taken more than eight years and has blown out to an estimated cost of $866 million. 

The supercomputer is officially up and running, but what does it actually do?

"Right now for example, we can forecast four days ahead ...back in 2014 we could forecast two days ahead," BoM general manager Mike Logan said.

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"So for something like maximum temperature, we've seen two extra lead days of skill over the last decade.

"By bringing Australis II online and continually investing and evolving the supercomputing, we'll see that continuous improvement in forecasting accuracy keep going out into the future."

With the supercomputer finally up and running, it seems the only remaining question that surrounds Australis II is its location.

"In the interest of national security, it's not really known where the location is by very many people," Logan said.

"Certainly I don't know it.

"Lots of other people in the organisation don't know it, and that's just purely on the grounds of national security."

Watch the full video in the player above.