Dozens of buildings were damaged and crops destroyed when Cyclone Narelle passed over the resort town of Exmouth and tracked down the Western Australian coast.
Recovery and clean-up work following the storm was likely to take weeks, Emergency Services Commissioner Darren Klemm told reporters on Sunday.
After lashing coastal communities with 250km/h winds and dumping a year's worth of rain in a day, the now-subtropical low headed offshore overnight after barrelling across a large part of the state.
Exmouth, located on the North West Cape about 1250km from Perth, bore the brunt of the category four cyclone, which first crossed the Queensland coast more than a week earlier.
Four structures have been confirmed destroyed and 27 damaged though authorities expect those numbers to climb as more than 2000 homes in the area are assessed.
Power had been returned to 250 homes in the area on Sunday morning and emergency crews had arrived to help restore services to the remainder.
Work was also underway to repair water infrastructure.
Roads were being progressively cleared to allow emergency services and supplies through, although some remained inundated and too dangerous.
The town's airport has been extensively damaged and commercial flights are grounded.
Significant damage to 30 pastoral properties and crops in the banana-growing Carnarvon region have also been reported.
WA Premier Roger Cook said heavy rainfall and damaging winds were no longer expected in the state's south and the worst appeared to be over.
With the Easter break approaching, he urged tourists to contact operators before changing any travel plans.
"We don't want them to not go and spend their dollars in those regional towns," he said.
State relief payments of up to $4000 have been made available to cover the immediate needs of residents, such as temporary accommodation or emergency transport.
Water levels on the Gascoyne River, which cuts through the state's interior to Carnarvon, were elevated and a handful of properties were still at risk of flooding.
Exmouth local Craig Kitson said the devastation in the town was extensive.
"The town has fundamentally changed," he told AAP.
Although he lost a fence and spent the night under a leaking roof, Mr Kitson counted himself lucky.
"It was definitely a harrowing night there for a lot of people" he said, adding some homes had been completely destroyed.
"Some people's lives have been drastically changed."
Narelle tracked south to Coral Bay and came ashore on Friday evening just south of the tiny town before weakening to a category-three system.
It was downgraded again northeast of Kalbarri and Geraldton before weakening to a tropical low on Saturday morning.
Narelle has also exacerbated the global energy supply crunch by disrupting production at two of Australia's biggest liquefied natural gas plants run by Chevron and Woodside.
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