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Most of the rain will fall along more than 700km of the central and northern parts of the coast, from Townsville down to Rockhampton and inland to Longreach and Winton.
Towns in that area already received a lot of rain over the Anzac Day long weekend and catchments are very full.
“That is five times the monthly rainfall in May for Longreach,” Browne said, adding that rainfall forecast is “conservative”.
“It’s very unusual for May.
“The responsible character is a large high-pressure system in the Tasman Sea. And that’s drawing a huge north-easterly fetch of moisture down from the Solomon Islands.”
Browne said rain will develop over inland regions from tonight, with the system shifting toward the coast later tomorrow.
Up to 400mm of rain could fall on parts of the coast in just 48 hours, with the SES preparing for emergency situations.
The Bureau of Meteorology (BoM) said it was likely flood watch warnings would be released throughout the day.
People in the affected areas are urged to stay across the warnings and updates and keep off the roads if possible.
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Tuesday to Thursday is set to be the biggest danger period.
The state’s south-east is not set to see as much rain, but a severe wind warning is in place for the region.
The Sunshine Coast is also bracing for a thunderstorm and up to 90mm of rain.