Mr Frater said the council was monitoring areas in Nelson including Cable Bay and Rocks Rd, and in Golden Bay including Pohara Valley, Liger Bay and Wainui.
"They're the ones that have had the majority of the damage in the recent floods, and the ones we need to keep an eye on," Mr Frater told Radio New Zealand.
"However, we also need to keep an eye on any areas, particularly around residential areas, where there have been slips ... further rainfall could actually affect the slips, make them worse."
Mr Frater said people in areas with the potential for slips should move out if they could.
"If rainfall gets really heavy and it's an area that's been subject to slips recently, if it was me I think I'd be moving out.
"But at this stage we don't have plans for formal evacuations, but we do have our emergency operations centre ready to go at any moment."
It was not yet known which areas would be worst hit this time around.
Hydrologists would meet today to discuss where those areas might be but it was hoped the rain would fall mostly in the mountains, rather than on the coast.
Geotech engineers had been assessing areas of greatest concern where there might be further landslips.
Residents had asked for sandbags, but these were being given out "on a needs basis".
Holidaymakers in tents were advised to "stick tight, go to the movies and have fun".
"We get weather events this time of the year, and camping grounds and campers are pretty hardy people and they generally deal with it."
Neil Stewart, whose holiday home in Golden Bay got more than a metre of water through it in the floods - on top of earthquake damage to his own home in Christchurch - is not concerned about the chance of more flooding.
He viewed this month's deluge as a freak event. "It was just an amazing flood they had."
