An Australian woman has been left bruised and battered after being pelted by hailstones that had smashed her car's windows during a violent storm in Queensland.

Fiona Simpson posted images of her injuries on Facebook and recounted her story of taking the brunt of the storm while on the D'Aguilar Highway, about 200 kilometres north-west of Brisbane, with her baby and grandmother on Thursday.

She described covering her baby with her body when the windows blew out, leaving her back, arms and head badly bruised.

FACEBOOK Fiona Simpson shielded her baby girl after hail smashed the window of their car and started pelting them.

"My entire back, arms and head are badly bruised," she said.

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"I'm just so relieved that my daughter and grandmother are alright."

FACEBOOK Fiona Simpson's back and shoulder took a hammering from the hail.

Two supercells hit southeast Queensland on Thursday, causing widespread damage and bringing tornados.

Along with the hail, there was flash flooding, with some people reportedly trapped in cars for several hours. Roofs were ripped up and roads cut by fallen trees.

Some farmers lost entire crops, and Tansey resident Greg Hellmuth told Today the noise was unbelievable. "So we ran inside and everything was going sideways, all the trees were going sideways. We went under the mattress and that's where we stayed."

"When we opened the door it was just devastation," Hellmuth said.

MELINDA ELLISON The Queensland town of Gympie was covered in a blanket of white after a fierce hailstorm passed over.

Queensland Fire and Emergency Services said it received more than 320 calls for help.

"There's a lot of damage out there, mainly structural, there's a lot of debris around the place, we've got trees down, broken windows – people are quite distressed," emergency management director Brian Cox said.

Gympie resident Melinda Ellison said the surrounding hills looked like ski fields.

"I have never seen hail like that before, it was really loud and extremely scary as I was home alone," she said.

"It was so loud, like a freight train going through the house."

Daniel Tessmann, a dairy farmer at Coolabunia on the outskirts of Kingaroy, said he had never seen anything like it. His farm lost part of a roof and a crop of feed that was knee high was now "down to nothing".

"My uncle's house is on the property and his windows were smashed and he lost a roof so the kitchen is all exposed, it looks like a swimming pool," Tessmann said.