SEVERE WEATHER WARNING.
ISSUED BY MetService AT 8:39pm 02-Aug-2015
URGENT - IMMEDIATE BROADCAST IN: Westland, Buller, Canterbury, Nelson
HEAVY RAIN FOR THE NORTH AND WEST OF THE SOUTH ISLAND, INCLUDING
PARTS OF NELSON AND THE HEADWATERS OF THE CANTERBURY LAKES AND
Unsettled weather is expected over New Zealand for the coming week,
with a series of troughs moving across the country. A moist north to
northwest flow is strengthening over the South Island on Sunday night
and should persist through Monday, bringing bursts of heavy rain to
western and northern parts of the South Island. The heaviest rain is
expected to be in Westland (especially north of Fox Glacier), Buller,
Nelson Lakes, and western Nelson, where 150 to 250mm could accumulate
about the ranges, and 70 to 100mm are possible about remaining parts
of Buller, western Nelson and northern Westland over a 27 hour
period.In addition, spill-over rain is forecast for the headwaters of
the Canterbury lakes and rivers and 90 to 120mm could accumulate
within 20km east of the divide on Monday.
This is a significant amount of rain, especially about Buller, and
people are advised that streams and rivers are likely to rise
rapidly, with surface flooding and slips possible.
Note, further periods of heavy rain are forecast for Buller and
Westland for the rest of the week.
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HEAVY RAIN WARNING
AREA/S AFFECTED: THE RANGES OF WESTLAND SOUTH OF FOX GLACIER
Rain is expected to become heavy Monday morning, then ease in the
afternoon. In the 9 hours between 6am and 3pm Monday, expect 60 to
90mm to accumulate. Peak intensities of 10 to 20mm per hour late
morning and early afternoon.
FREEZING LEVEL: 2000 metres.
AREA/S AFFECTED: WESTLAND FROM FOX GLACIER NORTHWARDS
Periods of heavy rain are expected to ease Monday night. In the 27
hours between 9pm Sunday and midnight Monday, expect 150 to 250mm to
accumulate about the ranges and 70 to 90mm near the coast. Peak
intensities of 20 to 25mm per hour Monday morning and afternoon.
FREEZING LEVEL: 2200 metres
AREA/S AFFECTED: BULLER, INCLUDING THE PAPAROA RANGE
Rain is expected to become heavy Monday morning and should ease
Tuesday morning. In the 27 hours between 6am Monday and 9am Tuesday
expect 150 to 250mm to accumulate about the ranges, with 70 to 100mm
elsewhere. Peak intensities of 20 to 25mm per hour Monday afternoon
FREEZING LEVEL: 2300 metres
AREA/S AFFECTED: THE HEADWATERS OF THE CANTERBURY LAKES AND RIVERS
Heavy rain is expected during Monday. In the 18 hours between 6am and
midnight Monday, expect 150 to 200mm near the divide and 90 to 120mm
within 20km east of the divide. Peak intensities of 20 to 25mm per
FREEZING LEVEL: 2200 metres
AREA/S AFFECTED: WESTERN NELSON, INCLUDING NELSON LAKES NATIONAL PARK
Northwesterly rain is expected to become heavy about the ranges
during Monday morning then ease about midday Tuesday. In the 27 hours
from 9am Monday to midday Tuesday expect 200 to 250mm to accumulate
about the northwest Nelson Ranges (Kahurangi), with 100 to 150mm
about the ranges of Nelson Lakes, and 70 to 100mm about remaining
parts of western Nelson. Peak intensities 15 to 20mm per hour about
the ranges Tuesday morning.
FREEZING LEVEL: About 2500 metres.
NEXT SEVERE WEATHER WARNING WILL BE ISSUED AT OR BEFORE
9:00am Monday 03-Aug-2015
Forecast prepared by: Leigh Matheson
For further information after 9pm Sunday 2 August contact Duty
Forecaster John Crouch or Stephen Glassey
A service provided through a contract with the Crown
Short Range Forecast
Northland, Auckland and Coromandel Peninsula: Cloudy periods and the odd shower.
Waikato to Taranaki, including Bay of Plenty and the central high country: Cloudy with patchy drizzle.
Wanganui, Manawatu, Gisborne, Hawkes Bay and Wairarapa: Mostly cloudy. Scattered rain developing in Wairarapa during the morning.
Horowhenua, Kapiti and Wellington, also Nelson and Marlborough: Occasional rain developing in the morning, with heavy falls about the western Nelson Ranges. Northwest gales in exposed parts of Wellington and the Marlborough Sounds.
Buller, Westland and Fiordland: Rain, with heavy falls and a few thunderstorms.
Canterbury, Otago and Southland: High cloud, with rain about the Alps and a few spots further east until afternoon. Chance afternoon shower in eastern Otago.
Chatham Islands: Mostly cloudy with the odd shower.
Tuesday: North Island, rain, turning to showers from Waikato to Wellington, and clearing Wairarapa. Gale northwesterlies in exposed places, possibly severe gale in Wellington. South Island, rain in the west, clearing in the north. High cloud elsewhere, with few spots of rain in the south.
Wednesday: North Island, becoming fine from Taranaki to Wairarapa southwards. Rain or showers elsewhere. South Island, rain spreading north to the Glaciers in the west, few showers further north. Mainly fine elsewhere.
Thursday: North Island, rain with heavy falls in the northeast, clearing. Showers elsewhere, but fine in Wairarapa. Northwesterlies rising to gale about Cook Strait. South Island, rain with heavy falls spreading northwards in the west. High cloud in the east, with scattered rain south of Christchurch.
Friday: Chatham Islands: Rain at times Tuesday and Wednesday. Strong northerlies dying out Wednesday. Rain with heavy falls on Thursday, northerlies rising to gale, changing lighter westerly late.