Wind and rain are set to hit the country later this week, the MetService says.
The first trough is due to hit the South Island tomorrow and the MetService has issued a heavy rain warning for Westland and the headwaters of Canterbury rivers.
"Hold on to your hats, folks," MetService spokesman Bob McDavitt said.
"As this trough approaches a strong and blustery northerly flow should build over the South Island (tomorrow)."
Many other South Island areas, as well as Wellington, Wairarapa and Taranaki ranges may be affected tomorrow or Wednesday.
The second trough was likely to hit southern Hawke's Bay and northern Wairarapa on Thursday and may cause severe westerly gales.
