After a wet start to Wednesday, MetService is advising Nelsonians thinking of heading outdoors this weekend, or travelling across to Marlborough or Cook Strait, to keep a close eye on the weather.
A deep low of tropical origin is expected to approach the far north, then move south over the North Island during Saturday and Sunday, which could affect parts of the top of the South Island.
The MetService said at this stage there was still some uncertainty about the track and depth of the approaching low, but many parts of the North Island and upper South Island "may be in line for severe weather over the weekend".
There is a moderate risk of heavy rain over much of the North Island for a time during Saturday and Sunday, spreading south to Cook Strait, Marlborough and northern Canterbury on Sunday.
In addition, there is a moderate risk of severe gale easterlies spreading south over northern parts of the North Island on Saturday, then affecting Cook Strait, Kapiti Coast, Marlborough Sounds, Manawatu and Taranaki on Sunday.
MetService meteorologist John Law said Nelson could expect patchy rain and little more than a "bog standard" southeasterly, but at the moment there was more concern for northern New Zealand and the east coast.
"It's not expected to be severe in Nelson but keep an eye on the forecast. The weather is more likely to be severe in the ranges and in Marlborough."
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