UPDATE: Sunday's rainfall is now forecast to be 60-80mm.

The Bureau of Meteorology has released a minor to moderate flood watch for the Wilsons River as well as the Richmond and Tweed Rivers.

A low-pressure system is forecast to develop near the northern New South Wales coast on Sunday and move south during Monday, bringing moderate to heavy rain to the northern coast, including the Northern Rivers.

This rainfall may cause minor to moderate flooding along the Wilsons, Richmond and Tweed Rivers from Sunday.

The Bureau's forecast is for 10-30mm tomorrow (Saturday) but as we have seen so far with the low coming from the west, Lismore and the Northern Rivers have been on the lower end. May this continue for the last day of the Lismore Show.

Sunday 20-45mm is expected as the low moves south with Monday another 8-15mm. The forecast is for blue skies from Wednesday.

For the latest flood and weather warnings see www.bom.gov.au/nsw/warnings/.

For the latest rainfall and weather forecasts see www.bom.gov.au/australia/meteye/.

For the latest rainfall and river level information see www.bom.gov.au/nsw/flood.

Flood Safety Advice:

This Flood Watch means that people living or working along rivers and streams must monitor the latest weather forecasts and warnings and be ready to move to higher ground should flooding develop.

Flood Warnings will be issued if Minor Flood Level is expected to be exceeded at key sites along the main rivers for which the Bureau of Meteorology provides a flood warning service.

Severe Weather Warnings will be issued or updated if very heavy rain is forecast or observed.

For more information on the Flood Watch Service: www.bom.gov.au/water/floods/FloodWarningServices.shtml

FloodSafe advice is available at www.ses.nsw.gov.au

For emergency assistance call the SES on telephone number 132 500

For life-threatening emergencies, call 000 immediately