http://www.abc.net.au/news/stories/2011/02/02/3127394.htmQueenslanders have been told to prepare themselves for a terrifying 24 hours as the "most catastrophic storm ever" takes aim at heavily populated areas of the state's north.
Severe Tropical Cyclone Yasi was upgraded to category five this morning as the weather bureau warned it was likely to be "more life-threatening" than any storm seen in Australia in living memory.
Tens of thousands of people are fleeing their homes ahead of the monster storm, which is expected to hit the coast between Cairns and Innisfail with winds of up to 295 kilometres per hour near the core.
Premier Anna Bligh says the storm's expected landfall at about 10:00pm AEST is the worst possible news for a state which is already reeling from recent flooding.
She says Cyclone Yasi is the "most catastrophic storm to ever hit our coast".
"Frankly, I don't think Australia has ever seen a storm of this intensity in an area as populated as this stretch of our coast," she said.
"Whether it's cyclonic devastating winds, storm surge, or torrential rain further west as a result of this, we are facing an extreme event that will not be over in 24 hours, but will possibly take several days before the full flooding effect is felt across the region as well, potentially right through to Mount Isa.
"We are facing a storm of catastrophic proportions in a highly populated area. You've heard all of the statistics and what it all adds up to is a very, very frightening time for people and their families.
"This is not something that passes over the coast and is over in an hour. This is 24 hours of quite terrifying winds, anywhere up to 300 kilometres per hour, torrential rain, likely loss of electricity and mobile communications. People really need to be preparing themselves mentally as much as anything else."
The weather bureau says Cyclone Yasi poses an "extremely serious threat" to life and property within the warning area, especially between Port Douglas and Townsville.
"This impact is likely to be more life-threatening than any experienced during recent generations," the Bureau of Meteorology (BOM) said.
This morning, Cyclone Yasi was estimated to be 650 kilometres east north-east of Cairns and 650 kilometres north-east of Townsville, moving west south-west at 30 kilometres per hour.
The bureau says the low category five cyclone will continue to move in a west-south-westerly direction today, but could become a high category five before making landfall.
'Horrific' windSenior bureau forecaster Gordon Banks says it could take at least 24 hours for Cyclone Yasi to weaken after it crosses the coast.
"There's still potential for it to become stronger ... as a strong category five we could see wind gusts in excess of 320 kilometres an hour, which is just horrific."
He added: "If you're bunkering down in the regions it's going to be quite frightening and it's going to go on and on for quite some time."
The storm's size and power dwarfs Cyclone Tracy, which hit Darwin in 1974, killing 71 people.
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A cyclone warning is current for island and coastal areas from Cape Melville and Sarina, extending inland to Croydon and Hughenden.
The bureau says damaging winds with gusts up to 90kph are expected to develop on coastal islands later this morning, then extend onto the coast during the day, and further inland across the northern tropical interior overnight.
Between Cooktown and Ingham these winds will become destructive with gusts in excess of 125kph during the afternoon and very destructive with gusts above 280kph between Port Douglas and Cardwell during the evening as the cyclone approaches.
The very destructive winds can also occur on the seaward side of hills to the north of the cyclone and are also forecast to reach the Atherton Tablelands.
Flooding rains will develop from Cooktown to Sarina during the afternoon and then extend inland overnight.
A cyclone watch is current for coastal areas from the remaining tropical interior east of Camooweal and north of Winton.
Storm surgeThe weather bureau says the threat of a storm surge is also a serious concern with Cyclone Yasi coinciding with the high tide.
Destructive winds will cause damaging waves, flooding and dangerously strong currents.
Mr Banks says Yasi is moving quicker than expected.
"We have brought forward the time of a potential coastal crossing and now it unfortunately coincides with the high tide in that coastal area," he said.
"So certainly we would expect to see reasonably widespread inundation in the run-up to that coastal crossing."
'Stay calm'Authorities have urged north Queensland residents to stay calm and listen to safety advice as the storm moves in.
Residents in the cyclone danger zone have been told to turn off their electricity and gas, unplug appliances and fill bathtubs with water.
Queensland Emergency Services Minister Neil Roberts says mattresses and pillows should be kept close by.
"Often the safest place for people is in the smallest room in the home - that might be the laundry or the bathroom," he said.
He says history shows storm surges from severe cyclones can be deadly.
"Most lives were lost through storm surges - not through the wind of a cyclone," he said.
Emergency Management Queensland says a storm surge that inundated parts of Mackay in 1918 killed 13 people.
Main Roads Minister Craig Wallace has warned people in the cyclone danger zone to stay off the roads.
"We need to make sure our roads are clear for evacuees, police, road crews and emergency vehicles - I can't make it any clearer," he said.
"If you don't need to be out on our roads, stay home and stay safe."
EvacuationsAlmost one-third of Townsville's population has been told to evacuate and residents are being warned to expect destructive winds by this afternoon.
Around 60,000 thousand residents in Townsville have been told to leave by lunchtime.
Thousands of travellers have left Cairns and Hamilton Island on extra flights provided overnight.
The Cairns airport is due to close later this morning.
The Townsville aiport will close its passenger terminal at 10am (AEST).
However, the runway in Townsville will remain open for defence and emergency services.
Authorities, assisted by the military, carried out forced evacuations overnight across low-lying areas of Townsville, Cairns and the Cassowary Coast.
Tens of thousands of people in north Queensland began fleeing their homes yesterday.
Residents in low-lying parts of Cairns and Townsville were told to move to higher ground and patients from two Cairns hospitals were flown to Brisbane overnight.
Authorities say people should leave for higher ground or seek shelter at evacuation centres, which opened at 6am in Cairns today.
People who have to leave their homes and have nowhere to go should call 1300 99 31 91 for help finding emergency accommodation.
Ms Bligh ordered mandatory evacuations yesterday after lengthy discussions with the Townsville City Council about the threat from a cyclonic storm surge.