Damage caused by tornadoes at Bargara.

Damage caused by tornadoes at Bargara. Photo: Nine News

SEVERAL areas of Queensland have been declared disaster zones after five tornadoes ripped through the Bundaberg region on Saturday afternoon.

The Premier, Campbell Newman, made the declarations as Gladstone began mass evacuations in the face of unprecedented rain expected over the next 24 hours.

All beaches from Tannum Sands, on the central Queensland coast, south to the NSW border are closed.

Unprecedented rain expected over 24 hours.

Unprecedented rain expected over 24 hours. Photo: Nine News

The tornadoes injured 17 people and damaged 150 properties.

Queensland Police warned of quick rising water in the Baffle Creek catchment, about 80 kilometres north of Bundaberg last night, with Mimdale identified as a major flooding risk.

The first tornado struck the coastal town of Bargara about 1pm, bringing down power lines, tearing off roofs and smashing windows. A man and a woman were seriously injured when their car was crushed by a falling tree. Both were flown to Brisbane in a critical condition.

Overflow ... Awoonga Dam.

Overflow ... Awoonga Dam. Photo: Gladstone Region Local Disaster

The Queensland Emergency Services Minister, Jack Dempsey, told Fairfax Media a triage centre had been set up in Bargara to treat 15 people hurt by flying glass and debris.

''The fact that these tornadoes are completely unpredictable … we can't say whether they're finished or whether more are coming,'' he said.

In Gladstone, about 2000 were set to evacuate on Saturday afternoon. A major flood emergency warning was issued by the SES for Winfield, as Baffle Creek was expected to rise above the 1971 record. Warnings were also issued for the Calliope, Kolan and Boyne rivers with the latter expected to swell to one-in-100-year levels.

Meanwhile, Brisbane was on standby on Saturday for its worst flooding since the disaster of 2011.

with Anne Tarasov