Massive systems will move from west to east, peaking on Saturday, the Bureau of Meteorology says.
Thunder and lightning could be seen from the top of the Northern Territory to the bottom of South Australia today as storm activity ramps up around the country.
The Bureau of Meteorology has forecast serious storm activity moving eastward from Western Australia through to the weekend, with Central Australia in the firing line today.
"Thunderstorms are possible all the way from the Top End into southern parts of South Australia," BoM meteorologist Jonathan How said in a Bureau forecast.
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"There remains an area where severe thunderstorms are possible across central Australia.
"In Queensland, thunderstorms start to dip a little further down into the southern interior and become more likely."
Tomorrow, a number of weather systems are forecast to merge, making thunderstorms possible over a "very broad" swathe of the country, including the west, the interior, and the east.
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This will include southern and south-eastern Queensland, north-east New South Wales, southern South Australia, and western Victoria.
"Saturday is the peak day for activity, with thunderstorms building through the day and peaking in the afternoon and evening," How said.
"By Saturday evening, thunderstorms are possible from central and eastern New South Wales up into Queensland and the north of the country. Severe thunderstorms may develop across populated areas during the afternoon and evening."
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However, he said, the weather maps were dynamic and likely to change, urging people to keep an eye on the BoM website for updates.
"Storms, particularly severe storms, can cause impacts," How said.
"Rain can wash away dirt and secondary roads, causing transport disruptions. Wind can cause damage to trees and property.
"Heavy rain and large hail can cause impacts to agricultural communities that are now starting to enter the harvesting season."
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