The NSW SES received an additional 100 calls for assistance on Thursday and Friday across Wagga, for a total of 300 incidents since damaging winds and heavy rain struck on Wednesday afternoon.

The Bureau of Meteorology has issued a minor flood warning for the Murrumbidgee River at Wagga for Friday, stating that the water might reach the minor flood level of 7.30 meters by Sunday afternoon.

"Heavy rainfall across the Murrumbidgee River catchment between Burrinjuck Dam and Wagga in the past 12 hours [on Friday] has caused rapid river rises in the upstream tributaries," the warning stated.

The Sturt Highway west of Wagga had its speed limit dropped to 40 kilometres per hour with stop/slow alternating lanes in places due to water being over the road.

The Olympic Highway was closed in both directions in Yerong Creek due to flooding and numerous other roads in Lockhart Shire were also closed.

SES Deputy Zone Commander Barry Griffiths said it was unlikely but possible that Wagga could see another "supercell" weather pattern in the next few days or weeks that could produce another destructive storm.

"The forecast is that even though we we will continue to see these severe afternoon thunderstorms, they are unlikely to be as severe as on Wednesday," he said.

"Though it is unlikely, if a supercell was to form, it could reproduce similar effects to what we saw in Wednesday and Thursday. There is still the potential for severe weather events in the Riverina.

"People need to be aware of the changing weather conditions, prepare their homes and act on any warnings."

Mr Griffiths said the thunderstorms were forecast to continue over the next few days and one crew had come in from Sydney to assist.

"As this weather continue, we are still getting calls. We've got a community sandbag point to provide sandbags out to the community and people can collect them [at 206 Fernleigh Road, Ashmont]," he said.

"We had one flood rescue out at Tumut [on Thursday night]. At this stage it looks like the rivers will remain at minor level and we're not expecting the rivers to be problematic."

North Wagga Residents Association' president Robyn Dawson said the Murrumbidgee River's forecast rise was below the level that could affect homes in the area.

"It might mean the lagoons fill up but at this present time we're not going for sandbags," she said.

Wagga and the Riverina has continued its cleanup of widespread damage from thunderstorms on Wednesday and Thursday even as severe weather kept rolling in on Friday.

Wagga recorded 55.6 millimetres of rain on Friday with Gundagai recording 74mm, Culcairn recording 57.4mm, Junee recording 44mm, Tumbarumba recording 38mm and Temora recording 23mm.

Fire and Rescue NSW Riverina Zone Commander Superintendent Stewart Alexander said firefighters had deployed six fire engines and senior officers to Wagga from Albury and Henty to assist the SES.

"We worked until 1am on Thursday cleaning up and rendering safe the damage and all that," he said.

"During the day on Thursday and Friday we had more crews in Wagga at the request of the SES and we worked closely with them to clean up debris and unsafe tree limbs.

"We will keep an eye on the situation as it develops."

Superintendent Alexander said the most serious incidents attended by firefighters was for fallen power lines.

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