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Weather Warning


SEVERE WEATHER WARNING.
ISSUED BY MetService AT 8:20pm 23-Jul-2016
URGENT - IMMEDIATE BROADCAST IN: Westland, Canterbury High Country,
Buller, Nelson, Marlborough, Tararua, Wairarapa, Kapiti Horowhenua,
Wellington, Taihape, Taranaki, Wanganui, Manawatu, Northland,
Auckland, Great Barrier Island, Waikato, Waitomo, Coromandel
Peninsula, Bay Of Plenty, Rotorua, Gisborne, Chatham Islands,
Fiordland, Southland

HEAVY RAIN IN THE WEST OF THE SOUTH ISLAND AND THE TARARUA RANGE.
ALSO, SEVERE NORTH TO NORTHWEST GALES ABOUT MUCH OF THE NORTH ISLAND,
AND THE CHATHAM ISLANDS.
An active front over the upper South Island is forecast to cross the
North Island overnight Saturday. The front is preceded by a strong
northwest flow, spreading rain to most places, and followed by
disturbed westerlies.
Heavy rain is falling in the the west and north of the South Island,
with the heaviest rain expected in the Westland ranges where a
further 200mm may accumulate through to Sunday evening. Heavy rain is
expected to be relatively brief over the Richmond, Bryant and Tararua
Ranges, where rainfall may reach short duration criteria, for
example, 50mm or more in 6 hours.
People in these areas are advised that this amount of rain will cause
rivers and streams to rise rapidly and may cause slips and surface
flooding.
In addition, north to northwest winds are expected to strengthen
ahead of the front, with gusts of 120 km/h possible in many
locations. About Wellington, Wairarapa and the Marlborough Sounds
gusts may reach 140 km/h or more.
As the front moves towards the Chatham Islands on Sunday, northwest
gusts there could also reach 120 km/h for a time.
Winds of this strength have the potential to be damaging,
particularly to trees, powerlines and unsecured structures and also
make for hazardous driving conditions, especially for tall sided
vehicles and motorcycles.
Also, on Sunday, heavy swells and large waves are expected to affect
western coasts and may cause coastal erosion in vulnerable areas and
make driving conditions hazardous about low-lying coastal roads.
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FOLLOWS.
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HEAVY RAIN WARNING
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AREA/S AFFECTED: WESTLAND
FORECAST:
Heavy rain is expected to continue through to Sunday evening. In the
23 hours from 9pm Saturday to 8pm Sunday expect a further 120 to
200mm of rain to accumulate in the ranges. During the same period
90mm is possible near the coast. Peak intensities of 25 mm per hour,
and possible thunderstorms.
FREEZING LEVEL: About 2200 metres, lowering to 1200 metres Sunday
morning.
AREA/S AFFECTED: HEADWATERS OF THE CANTERBURY LAKES AND RIVERS
FORECAST:
Heavy rain is expected to continue through Sunday morning. In the 15
hours from 9pm Saturday to midday Sunday, expect a further 120mm of
rain to accumulate about the main divide, and 80 to 100mm within 20km
east of the divide. Peak intensities of 25 mm per hour, and possible
thunderstorms.
FREEZING LEVEL: About 2200 metres, lowering to 1200 metres Sunday
morning.
AREA/S AFFECTED: BULLER
FORECAST:
Heavy rain is expected to continue through to Sunday afternoon. In
the 17 hours from 9pm Saturday to 2pm Sunday, expect a further 90 to
130mm of rain to accumulate about the ranges and 80mm near the coast.
Peak intensities of 25 mm per hour, and possible thunderstorms.
FREEZING LEVEL: About 2600 metres, lowering to 1400 metres Sunday
morning.
AREA/S AFFECTED: THE RANGES OF NELSON WEST OF MOTUEKA
FORECAST:
Heavy rain is expected to continue through to Sunday afternoon. In
the 17 hours from 9pm Saturday to 2pm Sunday expect 90 to 130mm of
rain. Peak intensities of 25 mm per hour with possible thunderstorms.
FREEZING LEVEL: About 2600 metres, lowering to 1400 metres Sunday
morning.
AREA/S AFFECTED: RICHMOND AND BRYANT RANGES
FORECAST:
Heavy rain should ease in the early hours of Sunday morning. In the 5
hours from 9pm Saturday to 2am Sunday, expect a further 40 to 70mm of
rain.
FREEZING LEVEL: About 2700 metres.
AREA/S AFFECTED: TARARUA RANGE
FORECAST:
A period of heavy rain is expected overnight Saturday into Sunday. In
the 7 hours from 9pm Saturday until 4am Sunday, 60 to 80mm of rain is
likely. Peak intensities of 20mm per hour possible.
_______________________
STRONG WIND WARNING
_______________________
AREA/S AFFECTED: WAIRARAPA, WELLINGTON AND THE MARLBOROUGH SOUNDS
FORECAST:
Until Sunday morning, severe gale northwesterlies gusting 140 km/h or
possibly more are expected. Note, further west to northwest gales are
expected during Sunday and could become severe again in Wairarapa
late Sunday afternoon or in the evening.
AREA/S AFFECTED: TARANAKI, TAIHAPE, WANGANUI, MANAWATU, HOROWHENUA
AND KAPITI COAST
FORECAST:
Until Sunday morning, severe gale northwesterlies gusting 120 km/h,
or possibly more, are likely. Note, westerly gales are also expected
to continue on Sunday and could also become severe for a time in the
evening.
AREA/S AFFECTED: NORTHLAND, AUCKLAND, COROMANDEL PENINSULA, WAIKATO,
WAITOMO, BAY OF PLENTY AND GISBORNE
FORECAST:
Northwest winds are expected to strengthen overnight Saturday to
Sunday. Winds may briefly reach severe gale with gusts of 120 km/h in
exposed places from late Saturday night until dawn Sunday.
AREA/S AFFECTED: CHATHAM ISLANDS
FORECAST:
Northwesterlies are expected to strengthen during Sunday. From about
midday Sunday until early Monday morning winds may reach severe gale
at times with gusts of 120 km/h.
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WARNINGS NO LONGER IN FORCE
_______________________________
HEAVY RAIN WARNINGS HAVE BEEN LIFTED FOR: FIORDLAND
STRONG WIND WARNINGS HAVE BEEN LIFTED FOR: FIORDLAND AND SOUTHLAND
WEST OF MOSSBURN
NEXT SEVERE WEATHER WARNING WILL BE ISSUED AT OR BEFORE
9:00am Sunday 24-Jul-2016
Forecast prepared by: William Nepe
For further information after 9pm contact Duty Forecaster Stephen
Glassey or Hordur Thordarson
A service provided through a contract with the Crown

Short Range Forecast

201607242359

WARNINGS ARE IN FORCE FOR SEVERE GALES AND HEAVY RAIN IN MANY AREAS.
Northland to Waikato, also Coromandel, Bay of Plenty and Taupo: Rain, with heavy and possibly thundery falls, turning to showers this morning and severe gale northwesterlies easing.
Gisborne and Hawkes Bay: Brief rain this morning, then mainly fine with the odd shower. Northwesterlies, severe gale in exposed places.
Waitomo to Wellington and Wairarapa, including Taumarunui and Taihape, also Nelson and Marlborough: Occasional showers, some heavy, clearing from Wellington this morning.West or northwest gales, severe at times.
Buller, Westland and Fiordland: Periods of rain, heavy at times with squally thunderstorms.
Canterbury: Rain at times about the Alps and high country. Mainly fine about the Plains, but scattered rain or showers morning and night. Northwesterly gales inland, possibly severe.
Southland and Otago: Rain becoming widespread this morning, and snow lowering to 400 metres.
Chatham Islands: Rain easing this afternoon. Northwesterlies rising to severe gale.

Extended Forecast

201607262359

Monday: Mainly fine in the east, but a few showers in the far south at first. Showers in the west, gradually clearing. Snow down to 500 metres in the far south.
Tuesday: North Island, a period of rain, with some heavy falls in the west, then a few showers in the west and dry in the east. South Island, a period of scattered rain for the far north. Mainly fine elsewhere, but a few showers then late rain for Fiordland, and late drizzle for Westland.
Wednesday: North Island, occasional showers in the west, and mainly fine in the east. South Island, periods of rain in the west, with heavy falls possible, and a few spots of rain in the east.
Chatham Islands: Showers and strong or gale southwesterlies on Monday. Showers and winds both easing on Tuesday, then a period of rain on Wednesday, and winds turning northwesterly for a time.

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