South-East Queensland is again bracing for flash flooding as another weather system batters the state's coast.

THE southeast's world-famous beaches could virtually disappear as more violent weather lashes the state.

Surfers Paradise beach has turned into a dangerous 3m cliff, while the Sunshine Coast's prized beaches could be stripped to their barest in almost 40 years this week as high tides, heavy rain and rising seas deliver yet another erosion blow.

There is more rock than sand along much of the Gold Coast's tourist strip, with long-time locals saying it is the worst they have seen the coastline since the 1974 floods.

Beaches from the Southport Spit to Miami remain closed, with huge sand cliffs creating dangerous drops, while access stairwells have been literally washed out to sea.

Council work crews have spent the past three days clearing debris off beaches but it is unlikely any will reopen for at least several days.

When the huge swells eventually subside, repair crews will attempt to replenish the beaches stripped of sand.

Surf Life Saving Queensland's Dave McLean said it appeared Sunshine Coast beaches were in for another pounding during the next three to four days.

It would be the third savage blow in just over a month.

"It's bad. There's no access for lifesavers and lifeguards, no way to get equipment down," he said.

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Fierce weather eats treasured beaches