SEVERE WEATHER WARNING.
ISSUED BY MetService AT 8:44pm 03-Aug-2015
URGENT - IMMEDIATE BROADCAST IN: Westland, Buller, Nelson, Wairarapa,
Wellington, Taranaki, Marlborough, Canterbury
HEAVY RAIN FOR THE NORTHWEST OF THE SOUTH ISLAND, THE TARARUA RANGE
AND MT TARANAKI. SEVERE NORTHERLY GALES FOR WELLINGTON AND SOUTH
Unsettled weather is expected over New Zealand for the coming week,
with a series of troughs moving across the country. A front has
stalled near Westport, and is expected to bring further heavy rain to
Buller and northwest Nelson, where a further 80 to 120mm could
accumulate about the ranges, on top of what has already fallen. This
front should move northwards tomorrow (Tuesday), bringing a period of
heavy rain to the Tararua Range and Mt Taranaki. 100 to 140mm of rain
is forecast for the Tararua Range, while for Mt Taranaki 70 to 90mm
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, although accumulations are expected to be
significantly less than in this event.
In addition, severe northerly gales are expected in Wellington and
South Wairarapa until late Tuesday afternoon, with gusts of 130 km/h
in exposed places, but 140 km/h gusts are possible for a time Tuesday
morning and afternoon. Winds of this strength have the potential to
damage trees, powerlines and unsecured structures, and make driving
hazardous for high-sided vehicles and motorcycles.
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HEAVY RAIN WARNING
AREA/S AFFECTED: WESTLAND FROM FOX GLACIER NORTHWARDS
Heavy rain has eased for now but another burst of heavy rain is
possible Tuesday morning. In the 10 hours between 2am and midday
Tuesday, another 60 to 80mm is possible about the ranges north of
Harihari. Peak intensities of 10 to 20mm per hour.
FREEZING LEVEL: 2200 metres.
AREA/S AFFECTED: BULLER, INCLUDING THE PAPAROA RANGE
Heavy rain is expected to ease around midday Tuesday. In the 15 hours
between 9pm Monday and midday Tuesday expect a further 80 to 120mm to
accumulate about the ranges, with 40 to 60mm elsewhere. Peak
intensities of 15 to 20mm per hour.
FREEZING LEVEL: 2300 metres.
AREA/S AFFECTED: WESTERN NELSON, INCLUDING NELSON LAKES NATIONAL PARK
Northwesterly rain is expected to ease around midday Tuesday. In the
15 hours between 9pm Monday and midday Tuesday, expect a further 80
to 120mm to accumulate about the ranges of northwest Nelson, and a
futher 60 to 100mm about Nelson Lakes. These amounts are on top of
what has already fallen. Peak intensities of 15 to 20mm per hour
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.
AREA/S AFFECTED: MT TARANAKI
Rain is likely to become heavy Tuesday morning. In the 14 hours
between 4am and 6pm Tuesday, expect 70 to 90mm to accumulate. Peak
intensities of 10 to 20mm per hour Tuesday afternoon.
STRONG WIND WARNING
AREA/S AFFECTED: WELLINGTON, WAIRARAPA SOUTH OF GREYTOWN
Severe north to northwest gales gusting 130 km/h in exposed places
expected to ease late tomorrow (Tuesday) afternoon. Winds expected to
peak Tuesday morning and early afternoon, when gusts of 140 km/h are
WARNINGS NO LONGER IN FORCE
HEAVY RAIN WARNINGS HAVE BEEN LIFTED FOR: THE HEADWATERS OF THE
CANTERBURY LAKES AND RIVERS
Heavy rain has eased and the warning is lifted. Note, a short burst
of heavy rain is likely Tuesday morning, but accumulations are not
expected to reach warning criteria.
NEXT SEVERE WEATHER WARNING WILL BE ISSUED AT OR BEFORE
9:00am Tuesday 04-Aug-2015
Forecast prepared by: Rochelle Fleming
For further information after 9pm Monday August 3rd contact Duty
Forecaster Hordur Thordarson
A service provided through a contract with the Crown
Short Range Forecast
Northland, Auckland, Coromandel, Bay of Plenty: Isolated showers, but rain with some heavy falls developing this evening.
Waikato to Taranaki, Taumarunui and Taupo, also Horowhenua to Wellington: Rain, with some heavy falls, clearing from the south this evening. Severe northwest gales in exposed parts of Wellington.
Taihape, Whanganui, Manawatu, Gisborne, Hawkes Bay and Wairarapa: Scattered rain in Wairarapa, spreading elsewhere this morning or afternoon. Clearing tonight. Severe northwest gales in exposed places in the south of Wairarapa.
Marlborough and Nelson: Rain with some heavy falls, but dry for the Kaikoura Coast. Clearing this afternoon.
Canterbury and Otago: Rain about the Alps. Scattered showers elsewhere this afternoon or evening, mainly in Otago and South Canterbury.
Buller to Fiordland, also Southland: Rain or showers, with heavy falls and possible thunderstorms, easing this evening.
Chatham Islands: Cloudy, with rain tonight.
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.