Visitors flocking to Queensland's Darling Downs for the annual Carnival of Flowers in Toowoomba are advised to take an umbrella, with thunderstorms forecast for the region on Friday.

The Bureau of Meteorology said showers and thunderstorms were also expected on Friday across the state's south-east, including Brisbane and the Gold and Sunshine coasts.

Possible severe storms were forecast for Saturday, before conditions were expected to ease on Sunday.

Bureau meteorologist Jordi Cairol said thunderstorms over the next two days could include heavy rainfall, large hail and damaging wind.

"It's pretty much across the southern part of the state from the Channel Country to the south-east coast and pretty much across all of the south but including the Darling Downs," Mr Cairol said.

He said t

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