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HAIL stones the size of tennis balls fell in the South Burnett. 

Hail as large as 6-7cm in diameter was reported after thunderstorms hit several parts of the South Burnett, including Kumbia, Blackbutt, Nanango, Coolabunia and Kingaroy.

Kumbia State School has reported significant damage to some of their classrooms and have requested parents to pick up their children at the earliest and safest convenience.

Residents have advised of flooding and trees down over Kingaroy-Cooyar Rd and on parts of the D'Aguilar Hwy between Nanango and Kingaroy.

There are also reports that Cooyar-Kingaroy Rd is knee deep in hail. 

Nanango MP Deb Frecklington has urged residents to stay safe.

"The storms that swept through my electorate this afternoon have hit and hit hard.

"There has been significant damage and we've heard reports of at least three people injured," she said.

"People are shaken up - it was a huge storm system and there may be more storms tonight and over the weekend.

"The coming days are going to be tough for a lot of people in my community as they clean up. We are a resilient bunch but this will test us," she said.

"A lot of farmers were getting ready to pick their crops at this time of year and this will be a massive setback.

"I urge everyone to stay safe and stay indoors tonight and listen to authorities."

The storm is continuing to track to the northeast and will hit Proston soon before moving toward Gympie.

BOM has advised a second severe thunderstorm has also developed near Chinchilla.

A severe thunderstorm warning covering the area between Seventeen Seventy on the Central coast to below Gympie, remains in place.

Coolabunia dairy farmer Damien Tessmann's property has been damaged by destructive winds, seen in the photos below.