New South Wales is forecast for eight very humid days with heavy rainfall and flash flooding forecast across much of the state.
The Bureau of Meteorology predicts that Wednesday could be the wettest day since September last year for parts of the state in the west, which could see more than a month of precipitation in 24 hours.
There will be a potential for severe thunderstorms in the western part of the state on Wednesday and Thursday.
Frequent but patchy showers and thunderstorms are expected to move eastward and flood some areas more than others.
Rain is expected to reach Sydney on Thursday and continue for much of next week.
“Due to the rainy nature of the rain, the totals are likely to be quite variable and some areas may see much larger accumulations than others if the showers continue to fall in the same spot,” said meteorologist Hugh McDowell.
The Bureau of Meteorology is forecasting widespread rainfall across NSW over the next 8 days.
Potential for flash floods and severe thunderstorms in some areas.
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Heavy rainfall could also cause flash floods in parts of New South Wales.
“Due to the high levels of humidity in the atmosphere, there is an increased risk of heavy precipitation which will lead to flash floods and could lead to the blockage and inaccessibility of some roads,” McDowell said.
Showers are expected to be more widespread on Thursday, particularly over much of the interior and southeast, with the possibility of severe thunderstorms.
The meteorological office expects the showers to focus on the eastern half of the state on Friday.
More rain is expected Sunday and Monday, particularly over the southeast.