North, mid-north NSW set for more rainfall

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A low pressure trough sitting off the NSW coast is set to continue dumping rain on the state's north and mid-north for another three days.

The trough has directed showers since Thursday over the mid-north coast, northern rivers and Hunter regions of NSW, with Dorrigo receiving almost 100mm of rain in the 24 hours to 9am on Friday.

More than 50mm of rain fell on Dungog over just two hours on Thursday.

An initial flood watch is in place for the Bellinger and Orara rivers, with the Bureau of Meteorology predicting more of the same over the weekend.

Both the Bellinger and Orara are already saturated from recent rainfall.

"It's entirely likely our hydrologists as they monitor this will be updating these watches and will potentially be putting warnings out, particularly if certain areas seem to get showers continually directed over them and into certain catchments," BOM meteorologist Helen Kirkup said in a statement.

"Catchments are very moist at the moment, it's going to run off very quickly."

Ms Kirkup said the trough would likely deepen over the weekend, increasing wind speed and the distribution of rainfall and thunderstorms.

This would continue mostly unabated until at least Sunday morning, while hazardous NSW surf conditions are likely to crop up later on Sunday.

Monday, however, should bring in more manageable weather.

Lord Howe Island will also likely cop significant rainfall.