Parts of NSW see month’s worth of rain in 12 hours as BoM warns of further drenching and possible flooding

BoM issues severe weather warning for the Illawarra and far southern suburbs of Sydney

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Sydney is expected to be drenched with more than 100mm of rain in the coming days and while the New South Wales east coast is under a flood watch as parts of the state more than a month's worth of rainfall in 12 hours.

The heavy rain kicked off on Wednesday night. The southern half of the Illawarra has been copping the worst of the downpour, where more than 180mm of rain was recorded in the 12 hours to midday.