SEVERE WEATHER WARNING.
ISSUED BY MetService AT 9:01am 03-Aug-2015
URGENT - IMMEDIATE BROADCAST IN: Westland, Buller, Canterbury,
Nelson, Wairarapa, Wellington
HEAVY RAIN FOR THE NORTH AND WEST OF THE SOUTH ISLAND AND THE TARARUA
Unsettled weather is expected over New Zealand for the coming week,
with a series of troughs moving across the country. A strong, moist
north to northwest flow covers the South Island bringing bursts of
heavy rain to western and northern parts of the South Island. The
heaviest rain is expected to be in the ranges of 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
may fall in remaining parts of Buller, western Nelson and northern
Westland. In addition, spill-over rain is forecast for the headwaters
of the Canterbury lakes and rivers and a further 60 to 100mm could
accumulate within 20km east of the divide until tonight.
Also, as the main fronts move northwards on Tuesday they are likely
to bring a period of heavy rain to the Tararua Range. 100 to 140mm of
rain could fall in the Tararua Range during Tuesday.
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
Heavy rain is expected to continue until this afternoon. In the 6
hours from 9am and 3pm Monday, expect a further 40 to 70mm of rain to
accumulate. Peak intensities of 10 to 20mm per hour are likely until
FREEZING LEVEL: 2000 metres.
AREA/S AFFECTED: WESTLAND FROM FOX GLACIER NORTHWARDS
Periods of heavy rain are expected to ease Monday night. In the 18
hours between 9am Monday and 3am Tuesday, expect a further 90 to
160mm to accumulate about the ranges and 40 to 70mm near the coast.
Peak intensities of 20 to 25mm per hour are possible until late
FREEZING LEVEL: 2200 metres
AREA/S AFFECTED: BULLER, INCLUDING THE PAPAROA RANGE
Heavy rain is expected to ease Tuesday morning. In the 24 hours
between 9am Monday and 9am Tuesday expect a further 100 to 200mm to
accumulate about the ranges, with 50 to 75mm elsewhere. Peak
intensities of 20 to 25mm per hour are likely this afternoon and
FREEZING LEVEL: 2300 metres
AREA/S AFFECTED: THE HEADWATERS OF THE CANTERBURY LAKES AND RIVERS
Heavy rain is expected to continue today, easing overnight tonight.
In the 15 hours between 9am and midnight Monday, expect a further 90
to 160mm near the divide and 60 to 100mm within 20km east of the
divide. Peak intensities of 20 to 25mm per hour are possible until
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.
AREA/S AFFECTED: THE TARARUA RANGE
Rain is expected to become heavy this evening then ease during
Tuesday evening. In the 18 hours from midnight Monday until 6pm
Tuesday, 100 to 140mm of rain is likely. The heaviest falls are
expected from about dawn on Tuesday until early Tuesday afternoon
when intensities of 10 to 20mm per hour are possible.
NEXT SEVERE WEATHER WARNING WILL BE ISSUED AT OR BEFORE
9:00pm Monday 03-Aug-2015
Forecast prepared by: Allister Gorman
A service provided through a contract with the Crown
Short Range Forecast
Northland, Auckland, Coromandel Peninsula, Bay of Plenty: Cloudy periods with isolated showers. Rain tomorrow evening, possibly heavy.
Waikato to Taranaki, Taupo, Taumarunui, Kapiti, Wellington: Patchy rain, more persistent with some heavy falls tomorrow. Rain clearing from south tomorrow afternoon. Northwest gales in exposed parts of Wellington.
Wanganui, Taihape, Manawatu, Gisborne, Hawkes Bay, Wairarapa: Scattered rain south of Taihape, spreading elsewhere tomorrow then clearing from the south.
Marlborough, Nelson: Rain with some heavy falls in the west, but dry for the Kaikoura Coast. Clearing tomorrow.
Buller, Westland: Occasional rain, with heavy falls and possible thunderstorms. Clearing tomorrow evening.
Fiordland, Southland: Fine, but a few showers about coastal Fiordland today. Showers tomorrow, some heavy and possibly thundery.
Canterbury, Otago: High cloud today, with rain about the Alps. Scattered showers tomorrow afternoon or evening, mainly in Otago and South Canterbury.
Chatham Islands: Cloudy. Rain tomorrow morning.
Wednesday: North Island, rain with heavy falls gradually spreading southwards. South Island, mainly fine. Showers for Fiordland spreading to other western areas overnight. Rain developing for Marlborough overnight.
Thursday: North Island, rain with heavy falls in the north and west,easing. A period of rain for eastern areas, then fine. South Island, rain in the west spreading northwards, with heavy possibly thundery falls. Fine with high cloud in the east.
Friday: North Island, showers, turning to rain for a time with heavy falls, but just a few spots of afternoon rain for Gisborne and Hawkes Bay. South Island, showers in the west, some heavy and possibly thundery. High cloud in the east, and a few morning showers in the south.
Chatham Islands: Rain clearing Wednesday afternoon, and strong northerlies dying out. Rain with heavy falls developing Thursday and northerlies rising to gale, then easing to showers Friday with northerlies easing slightly.