Nine people attending a school fair were injured by giant hailstones in a supercell thunderstorm, as Australia's east prepares for more wild weather.

Giant hailstones, some measuring as big as 9cm, and heavy rain smashed south east Queensland on Saturday afternoon.

Paramedics assessed nine people, all with hail related injuries, at the 150th Anniversary of Esk State School, about an hour from Brisbane, on Saturday afternoon.

One woman was taken to Ipswich Hospital with neck and head injuries, a man in his 20s was taken to Gatton Hospital with minor burns, and two women - one in her 20s and another in her 30s, were taken to hospitals privately, also with minor injuries.

Bands of thunderstorms lashed a region stretching from central Queensland down to northern NSW on Saturday, drenching

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