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.

"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

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