Southeast Queenslanders could face a second round of ferocious storms after severe cells lashed the region on Sunday night, dumping huge hail and wreaking havoc on the power network.

Repair crews are scrambling to restore power to about 51,000 properties that remain cut off after destructive winds, gusting above 100km/h in some places, downed hundreds of powerlines across the region.

Workers have managed to get power back on for 84,000 other properties, but Energex is warning residents in storm-affected suburbs to be wary and assume any fallen lines are live.

Logan City, south of Brisbane, still has more than 40,000 properties without electricity, Brisbane more than 6000, and Redland City about 2400.

Locals could have a long wait for the lights to come back on with power authorities saying it could be as late as Tuesday afternoon or evening in some locations.

Wild winds did much of the damage, with gusts of 109km/h recorded at Redcliffe, 107km/h in the Redlands district and 90km/h across Brisbane. At Boonah, west of Brisbane, residents posted pictures of huge hail stones on social media.

In Brisbane a young boy was taken to hospital after suffering an electric shock while showering when a lightning bolt hit the ground near his Ferny Grove home.

His injuries are not life threatening and he was taken to the Prince Charles hospital in a stable condition about 7pm (AEST).

Science guru Dr Karl Kruszelnicki says it's generally safe to shower during an electrical storm and the boy appears to have been unlucky.

He's told the ABC the home may not have been properly grounded, or that the lightning strike created an electrical field so powerful it spread in all directions and rendered the home's grounding system useless.

Three schools - inner-Brisbane girls school Stuartholme, Crestmead State School and Eagleby State School - have been closed on Monday due to storm-related problems.

The wild weather, after a day of baking heat across much of Queensland, generated more than 265,000 lightning strikes.

And forecasters say almost identical conditions on Monday could generate more gusty thunderstorms cross the southeast from Monday afternoon, including in Brisbane and on the Gold and Sunshine coasts.

Brisbane is headed for 35 degrees, Ipswich 38, the Sunshine Coast 34, and the Gold Coast 33, helping to create the kind of instability that fed Sunday night's storms.