This system is expected to start influencing the Northern Rivers from Wednesday with increasing showers and storms forecast north of about Evans Head on Wednesday. Some of these rain periods are expected to be heavy and frequent.

The wet is expected to be felt on the Mid North Coast from Port Macquarie and north.

Rain is forecast from tomorrow through to Friday in the Nambucca Valley.

"The intensity and path that Ex TC Trevor takes over the next few days will govern how much rain falls over northern NSW," NSW SES Northern Rivers Deputy Zone Commander, Mark Somers said.

"The Bureau of Meteorology will forecast rainfall amounts over the coming days as they monitor the behaviour of the system as it nears NSW.

"It's early days at this stage but now is a good time to prepare.

"There are a couple of important things you can do now to get ready for a severe weather event and these include checking your home and/or business emergency plan is up to date and to make sure your emergency kit is stocked and ready for use."

NSW SES community capability officer, Janet Pettit explained: "A part of your emergency plan should be to putting together an emergency kit. This kit should include items that you may need if you lose power or need to evacuate your home in a hurry.

What you need

 Portable radio and torch with spare batteries

 First aid kit

 Candles and waterproof matches

 Important papers and a copy of your emergency plan

 Waterproof document holder for these documents and valuables

For more flood and storm safety information and tools to help you put together a home or business emergency plan go to www.sesemergencyplan.com.au

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