How did a run-of-the-mill weather system cause WA's worst flooding?

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The type of weather system that caused the chaos is not uncommon. Weather reporter Tyne Logan examines the factors that made this tropical low so devastating.

According to the Bureau of Meteorology's WA manager James Ashley, it came down to an unfortunate combination of three key factors: time, energy, and structure.As ex-Tropical Cyclone Ellie circled the north, it poured heavy rainfall over the region.

"When you think of these record floods, with water so much higher than we've ever seen, you'd think there must have been more rainfall than we've ever seen," he said.Instead, he said it was the time spent over land that made the difference. The system hit the coast as a low-category cyclone on December 22 and quickly weakened to a tropical low.

A large portion of that stay was spent running laps around Fitzroy Crossing and, more significantly, the entire Fitzroy River catchment, according to Mr Ashley.The Fitzroy River catchment is 95,000 square kilometres — an area bigger than Tasmania.

 

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