Energex crews are working to restore power to customers who lost supplies during severe storms in South East Queensland, with the weather bringing strong winds, heavy rain and hail on Monday afternoon.

Storm warnings issued earlier today have since been cancelled.

Energex spokesman Danny Donald told ABC Radio Brisbane more than 19,000 customers had no power.

"If you're around the Scenic Rim area, particularly Beaudesert, it's going to be a lot of heavy lifting this evening by the crews, because they've had quite a bit of damage on the network," he said.

"We've got two very large substations down that carry about 4,000 customers each, so that's something we're going to focus on right now."

The storms also caused a signalling issue on the CityTrain Ipswich line, causing hour-long delays.

Buses were brought in to replace trains between Redbank and Ipswich stations in both directions.

Services were also been disrupted on the Sunshine Coast line between Caboolture and the Glass House Mountains, causing 30-minute delays.

Heavy rain at the weekend has done little to boost dam levels in South East Queensland, with combined storage capacity rising just 0.9 per cent, which is about two weeks' worth of supplies.

SEQwater spokeswoman Sophie Walker said a lot more rain was needed to make a difference.

"What we are seeing is that because it has been so dry the catchment is quite dry, so the rain that did fall has been soaked up by the ground," she said.

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