KEY POINTS:
Those planning outdoor activities in the next few days may need to think again as severe weather is on its way, the MetService says.
Meteorologists have issued wind and rain warnings for much of the South Island for Friday and Saturday.
A very deep depression over the Southern Ocean was expected to maintain a broad swathe of west to northwest winds over New Zealand for the next few days, MetService spokesman Bob McDavitt said.
"It has been a while since South Islanders have had such a vigorous northwester, so this one may surprise some people with its intensity," he said.
"Our warnings are currently forecasting rain amounts of 250 to 350mm in the Westland ranges during Friday and Saturday, and wind gusts of 120kmh for exposed inland parts of Southland, Otago and Canterbury.
"Anyone who is planning a tramping trip or a visit to the great outdoors will now need to seriously consider the impact of this wind and rain on their activities."
Mr McDavitt said the amounts of rain forecast were unusually large and would cause significant spillover into the headwaters of Otago and Canterbury rivers.
The forecast severe wind gusts had the potential to cause damage to powerlines, trees and roofs, and to make driving hazardous especially for motorcyclists or high-sided vehicles.
The severe wind and rain was also likely to move onto southern parts of the North Island on Saturday or Sunday.
"If you are planning something special over the weekend then please check the weather forecast first."
- NZPA
