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The rain has eased in Nelson and Marlborough but bad weather continues to loom over the lower North Island.
Wet weather has caused surface flooding and slips in the Wellington region, where one slip caused a commuter train to derail and be hit by another coming the other way at Plimmerton, north of the city.
MetService has issued a severe weather warning and is forecasting heavy rain over the next 24 hours as the front moves eastwards across central and northern New Zealand.
Click here for the weather warnings.
River levels falling, roads still closed
All roads in the Nelson City Council area have reopened except for Kokoroa Road and no further flooding was expected, Nelson City Council senior project manger Shane Davies said.
It was no longer raining heavily and river levels were dropping, Mr Davies said.
Marlborough roads asset manager David Miller said SH6 between Havelock and Rai Valley, 40km east of Nelson, which was closed after the Pelorus River burst its banks, would hopefully be reopened later this afternoon.
While rain was easing in the region there had been further slips in Marlborough, one causing the closure of the Port Underwood road about 1.30pm, Mr Miller said.
Bad weather moves north
New Zealand Transport Agency central operations manager Mark Owen said rain was causing delays due to surface flooding and slips around Wellington.
A slip on SH1 south of Tawa could result in traffic being reduced to one lane and slips were also causing delays on SH2 just before Petone and SH58 near Whitby in Porirua, Mr Owen said.
MetService said heavy falls of rain in the lower North Island and upper South Island were expected to gradually clear by this evening.
Some heavy falls were also expected in Northland, Auckland, Waikato, Coromandel, Bay of Plenty and Taupo tonight and these were expected to gradually clear tomorrow.
Environment Waikato is continuing to keep an eye on the levels of the Waikato and Waipa rivers following yesterday's warning of potential flooding around the already swollen rivers.
EW spokesperson Stephen Ward said there had been no reports of any significant rise in river flows yet.
He said 70 to 90 mm of rain was yesterday forecast to fall in the region over a 24-hour period from 6am this morning, but less was now expected.
"The latest forecast is for 60 to 90 mm. Obviously that is not much lower so we are still warning people to keep on their toes and listen to any warnings from us.
- with NZPA
