weather warning

SIGNIFICANT HEAVY RAIN FOR THE SOUTH ISLAND WEST COAST AND CANTERBURY HEADWATERS


extended nz forecast

regional forecast

coastal marine forecast

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Friday

A cooler day with long fine spells, but also isolated showers.

Saturday

North Island, cloud increasing, with a few late showers in the north. South Island, cloud increasing, with rain developing in the west, and scattered late rain elsewhere.

Sunday

Rain for most places, possibly heavy, then mainly fine for the eastern North Island and Nelson, and a few showers elsewhere.

Chatham Islands Cloudy periods, a few showers, and southwesterlies on Friday, then mainly fine with light winds on Saturday. Rain and gale northerlies developing on Sunday.

WARNINGS FOR HEAVY RAIN AND SEVERE GALES FOR MUCH OF THE SOUTH ISLAND AND LOWER NORTH ISLAND

Northland to Taumarunui and Taupo, including Bay of Plenty

Cloudy periods today. A periof of rain around the middle of tomorrow, then clearing.

Gisborne, Hawkes Bay and Wairarapa

Mainly fine today. Scattered rain tomorrow, with northwesterly gales in exposed places, clearing from afternoon.

Taranaki and Taihape to Wellington, also Nelson and Marlborough

Rain this evening and overnight, with heavy falls, then clearing tomorrow, but showers return towards evening. Severe northwest gales in Wellington, Wairarapa and Marlborough easing tomorrow morning.

Buller, Westland and Fiordland

Heavy rain with possible thunderstorms, turning to showers tomorrow morning, then clearing south of Hokitika in the afternoon. Severe westerly gales about Fiordland early tomorrow.

Canterbury

Occasional rain today. Showers tomorrow afternoon and evening, with thunderstorms in the north. Severe northwest gales in exposed places, easing tomorrow morning.

Otago and Southland

Periods of rain, easing to showers tomorrow afternoon. Severe southwest gales in exposed places tomorrow morning.

Chatham Islands

Cloudy periods today. Occasional rain tomorrow.

Conway

*STORM WARNING IN FORCE* North of Kaikoura: Northerly 35 knots,rising to 50 knots this evening. Easing to northwest 30 knots Thursday morning, changing southwest 20 knots late Thursday afternoon.Elsewhere: Northeast 20 knots, rising to 35 knots this evening.Turning northwest 30 knots Thursday morning, changing southwest 25 knots Thursday afternoon. Sea becoming high for a time in the north. Northeast swell 2 metres developing for a time offshore. Southerly swell 2 metres developing. Poor visibility in showers developing Thursday afternoon.

Outlook following 3 days: Southwest 25 knots, dying out Friday morning. Developing late Friday northeast 15 knots, rising Saturday 25 knots and early Sunday 40 knots with very rough sea. Changing late Sunday southwest 25 knots. Moderate southerly swell at times.Moderate northeast swell developing Sunday.

Rangitata

*GALE WARNING IN FORCE* Northeast 20 knots, becoming northwest 35 knots early Thursday morning. Changing southwest 40 knots late Thursday morning, then easing to 30 knots Thursday evening. Sea becoming very rough for a time. Southerly swell rising to 4 metres.Northeast swell 1 metre developing offshore for a time. Poor visibility in periods of rain.

Outlook following 3 days: Southwest 20 knots turning late Friday northeast 15 knots. Changing early Sunday southerly 35 knots and rising late Sunday 45 knots with high sea. Heavy southerly swell easing Friday.

Christchurch

Inshore waters from Lyttelton Harbour to the Waimakariri River mouth.

Situation
A complex trough lies over the South Island today, while a low approaching from the Tasman Sea deepens rapidly over the lower South Island tonight. The low moves southeast on Thursday, followed by a ridge on Friday. Another deep low approaches New Zealand from the west on Saturday and moves over the South Island on Sunday.

Warning
STORM warning for CONWAY

Forecast
Strong wind advisory. Wednesday: Easterly 20 knots, becoming northerly 20 knots gusting 30 knots late afternoon, rising to 30 knots gusting 45 knots this evening. Sea becoming rough this evening. Fair visibility in rain at times. Thursday: Northerly 30 knots gusting 45 knots, turning northwest 25 knots gusting 45 knots in the morning, then southwest 25 knots gusting 40 knots early afternoon. Southwest easing to 20 knots in the evening. Rough sea, easing in the evening. Poor visibility in showers developing early afternoon.

Outlook
Outlook until midnight Sunday: Friday: Southwest 15 knots dying out early. Northeast 15 knots developing in the afternoon. Fine. Saturday: Northeast 15 knots. Cloud increasing, chance late rain. Sunday: Northeast 30 knots changing southwest 30 knots. Rain clearing late.

Swell
Swell forecast to midnight Sunday: Northeast half a metre, rising to 1.5 metres overnight tonight, dying out during Thursday, then northeast 1 metre developing on Saturday and rising to 2 metres on Sunday. Southeast 1 metre developing late Thursday, dying out Saturday.