QLD and NSW begin the storm clean-up - Sky News Australia

A clean-up operation is under way in New South Wales after a wild weekend of weather unleashed 24-thousand lightning strikes and destroyed homes.

The SES will be concentrating its efforts in the north of the state, which was hit by a large storm cell that has left some homes beyond repair.

The Bureau of Meteorology says wind gusts of up to 100km per hour were recorded at the height of the storms.

The SES still has more than 150 jobs outstanding in the northern coast area around Woodburn and Ballina, with an additional six in the state's south.

Meanwhile the severe thunderstorms which dumped hail the size of softballs on some parts of southeast Queensland have left local councils with a major mop-up operation.

The Bureau of Meteorology (BoM) says the worst of the weather has passed and while more storm activity is possible, it's not likely.

Parts of the southeast saw huge hail - the largest the size of a softball - when severe thunderstorms swept through the region on the weekend.

'On Saturday, softball sized hail 9 to 10 cm across was reported at Brookstead, west of Toowoomba. There were quite a few places around there that had hail of that size,' forecaster Livio Regano told AAP on Monday.

'On Sunday about 5pm (AEST), there was similar sized hail reported around Boonah (west of the Gold Coast).'

When the hail reached Brisbane about an hour later it was slightly smaller, about the size of tennis balls, and that hit areas including suburban Toowong and Ashgrove.

'That's still big, make no mistake, but it's not quite the softball,' Mr Regano said.

Many communities also saw damage from winds that gusted above 100km/h at the weekend, and there was isolated flash flooding in parts of Brisbane.

Councils are still working to repair the damage and clear stormwater drains of debris, and say it will be some time until the damage bill is known.

Brisbane Lord Mayor Graham Quirk says council crews will be out in force on Monday, repairing infrastructure and assessing the damage.

The storms affected the Brisbane, Ipswich, Sunshine and Lockyer council areas, and there are also reports of some crop damage in the Granite Belt and on the Darling Downs.

Energex told AAP it had restored electricity to all 100,000 customers who lost power over the weekend, as more than 100,000 lightening strikes were recorded.

An Energex spokeswoman said the storms showed how important it was for people to prepare their homes.

The BoM has faced some criticism that it failed to issue a specific warning on Saturday morning until after wild weather hit some parts of Brisbane.

But a spokesman for Community Safety Minister Jack Dempsey said residents were warned on Friday about a series of super storms expected to hit the southeast over the weekend.

The spokesman told the ABC the public was told to prepare for wild weather and take necessary precautions.

Mike Shapland from Emergency Management Queensland said Brisbane's western suburbs had been worst hit.

They included Mt Ommaney, Middle Park, River Hills, Kenmore and Moggill.

'Damaged roofs, trees down across yards, tarps needed ... and water entering houses from that very heavy rain,' Mr Shapland told the ABC.

One Kenmore resident said he lost the roof of his patio, which 'disintegrated' in the storm.

'It was just horrendous, the noise was absolutely unbelievable,' the resident, identified only as Scott, told the ABC about his experience of Sunday's storm.

'Hail almost the size of tennis balls were coming down and smashing everywhere.

'It destroyed our roof over the patio - disintegrated it.'

He said the wind was also incredible and many trees were down in the area.