A cold front stretching across eastern Australia is bringing widespread rain across parts of Victoria, NSW and Queensland, with severe thunderstorms forecast to lash some areas.

Residents are warned heavy rain could bring flash flooding, large hailstorms and dangerous driving conditions, Bureau of Meteorology senior forecaster Miriam Bradbury said on Sunday.

"We are going to see a severe storm potential through Sunday afternoon and evening across the central parts of Victoria, including much of the greater Melbourne area, pushing up across much of the Riverina of NSW as well," she said.

The Victorian chief health officer warned there was an increased chance of epidemic thunderstorm asthma across the state's northern country region.

Epidemic thunderstorm asthma is where a large number o

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