SEVERE WEATHER WARNING.
ISSUED BY MetService AT 9:01am 25-Apr-2015
URGENT - IMMEDIATE BROADCAST IN: Fiordland, Westland, Nelson, Buller
HEAVY RAIN FOR THE WEST OF THE SOUTH ISLAND
A broad, complex trough, preceded by a strong, moist northerly flow,
is expected to slowly pass east over the country this ANZAC weekend.
A band of heavy rain and northerly gales precede this trough,
affecting the South Island late Saturday through into Monday, then
the North Island on Monday and early Tuesday. The heaviest falls are
likely in Fiordland and Westland south of Otira, especially about the
ranges, where 250 to 350mm may accumulate in a 24 hour period, with
up to 450mm for the entire event.
People are advised that rivers and streams in these areas will rise
rapidly, and surface flooding and slips are likely, as well as
hazardous driving conditions.
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HEAVY RAIN WARNING
AREA/S AFFECTED: FIORDLAND
Rain is expected to become heavy from midday Saturday. In the 24
hours between midday Saturday and midday Sunday, expect 200 to 250mm
to accumulate. Peak intensities of 25 to 30mm per hour Saturday night
and Sunday morning.
FREEZING LEVEL: About 2800 metres
AREA/S AFFECTED: WESTLAND SOUTH OF LAKE MOERAKI
Rain is expected to become heavy Saturday evening. In the 24 hours
between 6pm Saturday and 6pm Sunday, expect 250 to 300mm to
accumulate in the ranges, with 100 to 150mm possible near the coast.
Peak intensities of 25 to 30mm per hour Sunday morning.
FREEZING LEVEL: About 3000 metres.
AREA/S AFFECTED: WESTLAND BETWEEN OTIRA AND LAKE MOERAKI
Rain is expected to become heavy early Sunday morning. In the 27
hours between 3am Sunday and 6am Monday, expect 300 to 350mm to
accumulate in the ranges, but 450mm is possible about some of the
higher peaks. Near the coast, 100 to 120mm of rain is possible in the
same period. Peak intensities of 25 to 30mm per hour Sunday morning.
FREEZING LEVEL: About 3000 metres.
AREA/S AFFECTED: THE REMAINDER OF WESTLAND, BULLER AND NORTHWEST
Rain is expected to become heavy from midday Sunday. In the 30 hours
between midday Sunday and 6pm Monday, expect 150 to 200mm to
accumulate, especially about the Paparoa Range. Peak intensities of
20 to 25mm per hour Sunday night and Monday morning.
FREEZING LEVEL: About 3300 metres.
NEXT SEVERE WEATHER WARNING WILL BE ISSUED AT OR BEFORE
9:00pm Saturday 25-Apr-2015
Forecast prepared by: Rochelle Fleming
For further information after 1.30pm Saturday April 25th contact Duty
Forecaster Andy Downs
A service provided through a contract with the Crown
Short Range Forecast
Northland, Auckland, Coromandel, and Bay of Plenty: Cloudy periods and the odd shower.
Waikato to Taranaki, also Taupo: Fine spells. Cloud and a few showers developing about Taranaki and Taupo this evening.
Gisborne to Wairarapa, also Taihape and Wanganui to Wellington: Mainly fine. Cloudy periods in Wellington, and a few showers there late tomorrow.
Nelson and Buller: A few showers, turning to rain tomorrow with some heavy falls.
Westland and Fiordland : Rain, with heavy and possibly thundery falls, easing in Fiordland tomorrow morning.
Marlborough, Canterbury and inland Otago: High cloud increasing. Rain about the main divide becoming heavy this evening, and a few spots spreading further east at times.
North Otago and Dunedin: High cloud, and a few spots of rain possible. A few showers tomorrow afternoon, possibly thundery.
Clutha and Southland: Rain at times, possibly thundery tomorrow afternoon.
Chatham Islands : Cloudy.
Monday: North Island, rain spreading to most places, with heavy falls, especially in the north and west. Gale northerlies in exposed places, with severe gales in Wellington and Taranaki. South Island, rain or showers in most places, with heavy falls in the north. Gale or severe gale northerlies in Marlborough at first.
Tuesday: North Island, periods of rain in the south. Scattered showers further north, clearing in Gisborne. South Island, periods of rain in Marlborough, with scattered showers elsewhere. Snow to 700 metres in the far south, and to 900 metres about the southern main divide.
Wednesday: Showers, becoming isolated in the east and clearing central New Zealand.
Chatham Islands: Cloud increasing on Monday, with rain developing late in the day with northerlies rising to gale. Rain easing to a few showers on Tuesday as winds turn fresh westerly. Showers on Wednesday, more frequent from evening with westerlies rising to gale.