SEVERE WEATHER WARNING.
ISSUED BY MetService AT 9:02pm 26-Apr-2015
URGENT - IMMEDIATE BROADCAST IN: Westland, Buller, Nelson,
Marlborough, Canterbury, Taranaki, Taupo, Taihape, Taumarunui, Bay Of
Plenty Rotorua, Wellington, Fiordland, Otago
HEAVY RAIN AND GALES FOR MANY PLACES AS A SIGNIFICANT TROUGH MOVES
ACROSS NEW ZEALAND TONIGHT (SUNDAY) AND MONDAY.
A broad, complex trough, preceded by a strong, moist northerly flow,
is expected to slowly pass east over the country tonight (Sunday) and
during Monday. A band of very heavy rain and northerly gales precede
this trough, affecting the South Island tonight and Monday, then the
North Island during Monday. The heaviest falls are expected in the
west and north of the South Island, and also about Taranaki,
Tongariro National Park and the eastern ranges of Bay of Plenty.
Largest accumulations are likely in the ranges of Nelson and Mt
Taranaki where over 200mm of rain may accumulate in a 24 hour period.
This is a significant amount of rain even for these areas and people
there are advised that rivers and streams will rise rapidly and that
surface flooding and slips are likely, as well as hazardous driving
Severe northerly gales are also expected in Taranaki, the Marlborough
Sounds and Wellington during Monday, where gusts of 120-130km/h are
possible. Winds of this strength have the potential to damage trees,
powerlines and insecure structures, as well as make driving
Note: Heavy rain has eased in Fiordland, Westland south of Lake
Moeraki and the headwaters of the Otago lakes and rivers, and the
Warnings there are now lifted.
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HEAVY RAIN WARNING
AREA/S AFFECTED: WESTLAND BETWEEN OTIRA AND LAKE MOERAKI
Heavy rain is expected to slowly ease from the south overnight Sunday
and early Monday morning. In the 6 hours between 9pm Sunday and 3am
Monday, expect a further 60-80mm to accumulate about the ranges, but
another 100mm is possible about some higher peaks. A further 20-30mm
is expected near the coast during this time. Peak intensities of 20
to 30mm per hour in possible thunderstorms.
FREEZING LEVEL: About 3200 metres.
AREA/S AFFECTED: THE REMAINDER OF WESTLAND
Heavy rain is expected to ease early Monday morning. In the 9 hours
from 9pm Sunday to 6am Monday, expect a further 40 to 60mm to
accumulate, especially about the Paparoa Range. Peak intensities of
20 to 30mm per hour in possible thunderstorms.
FREEZING LEVEL: About 3300 metres.
AREA/S AFFECTED: BULLER
Heavy rain is expected to ease early Monday evening. In the 21 hours
from 9pm Sunday to 6pm Monday, expect a further 90 to 120mm to
accumulate. Peak intensities of 20 to 30mm per hour Monday morning
and afternoon with possible thunderstorms.
AREA/S AFFECTED: NELSON, INCLUDING THE RICHMOND AND BRYANT RANGES,
ALSO THE MARLBOROUGH SOUNDS
Heavy northerly rain is expected to ease early Monday evening. In the
21 hours from 9pm Sunday to 6pm Monday, expect 200-250mm to
accumulate about the ranges. 100-120mm is possible elsewhere. Peak
intensities of 20-30mm per hour Monday morning and afternoon.
Thunderstorms are also possible in the west.
FREEZING LEVEL: About 3300 metres
AREA/S AFFECTED: THE HEADWATERS OF THE CANTERBURY LAKES AND RIVERS
Heavy rain is expected to ease early Monday morning. In the 6 hours
between 9pm Sunday and 3am Monday, expect a further 60-80mm to
accumulate close to the Divide, with another 30mm falling within 15km
east of the Divide. Peak intensities of 20 to 30mm per hour in
FREEZING LEVEL: About 3200 metres.
AREA/S AFFECTED: TARANAKI
Rain is expected to become heavy overnight Sunday. In the 21 hours
between 3am and midnight Monday, expect 150-200mm to accumulate on Mt
Taranaki, with 80-100mm possible elsewhere, especially about North
Taranaki and the eastern hill country. Peak intensities of 20 to 30mm
per hour in possible thunderstorms.
AREA/S AFFECTED: TONGARIRO NATIONAL PARK
Rain is expected to become heavy early Monday morning. In the 18
hours between 6am and midnight Monday, expect 80-100mm to accumulate.
Peak intensities of 20 to 30mm per hour Monday afternoon.
AREA/S AFFECTED: RANGES OF EASTERN BAY OF PLENTY
A burst of heavy and possibly thundery rain is expected Monday
afternoon and evening. In the 12 hours between midday and midnight
Monday, expect 80 to 100mm to accumulate. Peak intensities of around
25mm per hour.
STRONG WIND WARNING
AREA/S AFFECTED: TARANAKI
Northerlies expected to rise to severe gale with gusts 120 km/h
Monday morning, especially about and south of the Mountain, and
should ease Monday evening.
AREA/S AFFECTED: WELLINGTON AND THE MARLBOROUGH SOUNDS
Northerlies expected to rise to severe gale with gusts 130 km/h early
Monday morning and should ease Monday evening. Winds are expected to
peak Monday afternoon or early evening.
WARNINGS NO LONGER IN FORCE
HEAVY RAIN WARNINGS HAVE BEEN LIFTED FOR: FIORDLAND
HEAVY RAIN WARNINGS HAVE BEEN LIFTED FOR: WESTLAND SOUTH OF LAKE
HEAVY RAIN WARNINGS HAVE BEEN LIFTED FOR: THE HEADWATERS OF THE OTAGO
LAKES AND RIVERS.
NEXT SEVERE WEATHER WARNING WILL BE ISSUED AT OR BEFORE
9:00am Monday 27-Apr-2015
Forecast prepared by: Sarah Garlick
For further information after 9pm contact Duty Forecaster Heath
A service provided through a contract with the Crown
Short Range Forecast
SEVERE WEATHER WARNINGS AND WATCHES IN FORCE FOR MANY PARTS OF THE COUNTRY
The northern North Island, from Waitomo and Taupo northwards, including Bay of Plenty: Periods of rain, with heavy falls and possible squally thunderstorms, easing in the west this evening. Strong or gale northerlies.
Gisborne to Wairarapa: Occasional rain. Northwest gales developing late today.
Taranaki and Taihape to Wellington, also Marlborough, Nelson, Buller and northern Westland: Periods of rain, heavy and possibly thundery at times. Severe northerly gales about Taranaki, Wellington and the Marlborough Sounds.
Southern Westland: Occasional showers, clearing this evening.
Canterbury and eastern Otago: Rain becoming widespread this afternoon, with some heavy falls possible, especially near the foothills.
Remainder of Otago, also Southland and Fiordland: Mostly cloudy with occasional showers.
Chatham Islands : Cloudy periods, rain developing this evening.
Tuesday: North Island, periods of rain in the south, easing.Scattered showers elsewhere, especially in the west. South Island, rain or showers north of Arthur s Pass. Showers elsewhere, becoming confined to Southland and Clutha. Snow to 800 metres in south at first.
Wednesday: North Island, mainly fine in Gisborne and Hawkes Bay. A few showers elsewhere. South Island, showers, mainly in south and west. Gale or severe gale southwesterlies about Southland and Otago coasts.
Thursday: North Island, scattered showers, becoming confined to the north and west. South Island, occasional rain in Southland. A few showers in Buller, Otago and about Banks Peninsula. Fine elsewhere.
Friday: A few showers north of Waikato and about Foveaux Strait,otherwise fine.
Chatham Islands: Rain easing to showers on Tuesday and strong westerlies easing. Showers on Wednesday, frequent from evening with westerlies rising to gale or severe gale. Showers and strong to gale southwesterlies on Thursday.