The weather bureau has issued a major flood watch for the Avon and Thompson rivers in Victoria's southeast.
There are moderate flood warnings for the Macalister, Mitchell and Snowy rivers and minor warnings for at least four other river systems.
Floodwaters in Gippsland are expected to cause some small communities to be isolated over the weekend, but they are not believed to be at risk of flooding.
There were 59 calls for assistance in the 24 hours to 6am on Saturday, State Emergency Service duty officer Shane McBride said.
Police and SES crews were called to a water rescue at Alberton West in the state's southeast overnight.
"If you are confronted with floodwaters, do not attempt to drive through those floodwaters. It may be the last decision you make," Mr McBride said.
The SES has received more than 900 requests for help since the beginning of the storm and rain event on Wednesday with about 700 relating to fallen trees.
Parts of eastern Victoria are likely to record rainfalls of 100mm over the weekend with already saturated areas inundated by 200 to 300mm of rain since Wednesday.
Severe thunderstorms are predicted to continue for much of the country's east coast.Â
WATCH & ACT - RIVERINE FLOOD - Avoid the Flooded Area - Thomson River downstream of Wandocka. — VICSES News (@vicsesnews) Stay safe. Be aware of potential hazards caused by flooding and never enter floodwater.More details at https://t.co/7GnHBqcqzK pic.twitter.com/sQdSvyCIPNDecember 1, 2023
Queensland is expecting showers and possible severe thunderstorms over most of the state on Saturday, with between five and 25mm of rain due in most places.
Storms knocked down powerlines in the state's southeast, leaving thousands without electricity overnight, government-owned provider Energex said.
Services are gradually being restored but more than 2500 people remain without power as of 10am local time with residents in the Sunshine Coast mostly impacted.
"Energex is working across South-East Queensland to repair damage caused by storms Friday afternoon and again this morning so power can be restored once it is safe to do so," the company said.
"We have wires down right across the Sunshine Coast and Ipswich Lockyer Valley. They should be treated as being live."
The energy provider has dispatched additional assistance to support local crews who have been working through the night.
Some parts of NSW's southeast copped more than 200mm of rain in the past few days, with two moderate flood warnings in place for the Snowy and Buchan rivers.
Storms bringing potentially heavy rain, damaging winds and large hail are likely to occur in the late afternoon and evening.
Today, NSW SES teams assessed 40 properties in flooded Lake Conjola. Simultaneously, assessments are ongoing in — NSW SES (@NSWSES) #Deniliquin. 📸 Community Field Liaison Officers & Rapid Impact Assessment teams in action at Deniliquin, NSW. #NSWSES #FloodAssessment pic.twitter.com/VjV3tk2KUoNovember 30, 2023
Minor flood warnings are in place for parts of southeast Queensland, mixed with warnings for heatwave conditions.
Parts of the state have been enduring scorching weather since Wednesday with high temperatures expected to impact the north and northeast through to next week.
Temperatures above 40C are expected to continue, with overnight lows only dipping to the high teens.
Heat warnings are also in place for northern parts of the Northern Territory including the possibility of severe conditions in the Tiwi District.
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