SEVERE WEATHER WARNING.
ISSUED BY MetService AT 8:56am 02-Dec-2015
URGENT - IMMEDIATE BROADCAST IN: Buller, Westland, Canterbury High
PERIODS OF HEAVY RAIN FOR THE WEST OF THE SOUTH ISLAND AND CANTERBURY
NEAR THE DIVIDE TODAY AND THURSDAY
Fronts embedded in a moist northwesterly flow are expected to bring
periods of heavy rain to the west of the South Island today. On
Thursday, another front is expected to move northeast over the South
Island bringing a further burst of heavy rain to the west and
significant spillover into the headwaters of the Canterbury lakes and
rivers. The largest accumulations are expected for the ranges of
Westland south of about Arthurs Pass where a total of 150 to 250 to
mm could accumulate.
This amount of rain may cause rivers and streams to rise rapidly and
FOR THE LATEST WEATHER AND FORECAST CHARTS PLEASE GO TO
MORE DETAILED INFORMATION FOR EMERGENCY MANAGERS AND TECHNICAL USERS
HEAVY RAIN WARNING
AREA/S AFFECTED: BULLER SOUTH OF KARAMEA
In the 15 hours from 9am today to midnight expect 60 to 80mm of rain
in addition to rain that has already accumulated. Intensities may
reach 10 to 15mm per hour at times, especially about the ranges.
AREA/S AFFECTED: WESTLAND
Rain is expected to become heavy this evening but ease late Thursday
afternoon. In the 24 hours from 6pm today to 6pm Thursday 100 to
250mm of rain are expected with the largest amounts about higher
parts of the Alps from about Arthurs Pass southwards. Peak
intensities 15 to 25mm per hour at times overnight Wednesday and
during Thursday morning.
FREEZING LEVEL: About 3400 metres, lowering to about 2500 metres
during Thursday afternoon.
AREA/S AFFECTED: THE HEADWATERS OF THE CANTERBURY LAKES AND RIVERS
FROM ARTHURS PASS SOUTHWARDS
In the 18 hours from midnight Wednesday to 6pm Thursday expect 200 to
250mm of rain to accumulate near the divide and 100 to 150mm within
10km east of the divide. Peak intensities of 15 to 25mm per hour at
times near the divide.
FREEZING LEVEL: About 3400m, lowering to 2800 metres Thursday
AREA/S AFFECTED: FIORDALAND
In the 9 hours from 3am Thursday to noon Thursday expect 70 to 100mm
of rain to accumulate. Peak intensities 15 to 25mm per hour.
FREEZING LEVEL: About 3200 metres, lowering to 2100 metres by noon
NEXT SEVERE WEATHER WARNING WILL BE ISSUED AT OR BEFORE
9:00pm Wednesday 02-Dec-2015
Forecast prepared by: Hordur Thordarson
For further information after 1:30pm contact Duty Forecaster Leigh
A service provided through a contract with the Crown
Short Range Forecast
In the north and west from Northland to Manawatu, including Bay of Plenty and the central high country: Often cloudy. Drizzle patches developing about Bay of Plenty and Taupo tomorrow, and isolated afternoon and evening showers elsewhere.
Gisborne and Hawkes Bay: Mostly fine, but isolated afternoon and evening showers inland tomorrow.
Horowhenua, Kapiti and Wellington, also Wairarapa: Mostly cloudy. Drizzle patches, mainly about the ranges.
Marlborough, Nelson and Buller: Occasional rain, more persistent and heavier about Nelson and Buller tomorrow evening.
Westland and Fiordland: Rain, with some heavy falls, easing to showers in Fiordland tomorrow morning and in Westland during the afternoon.
Canterbury: Fine and warm tonight. High cloud tomorrow, with rain about the Alps, and a few showers elsewhere in the afternoon and evening.
Otago and Southland: Fine and warm tonight. A period of rain tomorrow.
Chatham Islands: Rain tomorrow night.
Friday: North Island, occasional showers in the far north, some rain elsewhere, but just a few spots over the east coast. South Island, few showers in the south and west. Early showers in the north then fine.
Saturday: North Island, mainly fine about the east coast, a few showers elsewhere. South Island, rain becoming widespread, with some heavy falls in the west.
Sunday: North Island, a few showers in the far north, a period of rain spreading elsewhere. South Island, early rain in the north, easing to a few showers, and a few showers elsewhere.
Chatham Islands: On Friday, rain developing in the morning, then easing to a few showers later, with strong northerlies easing, and turning southwest. On Saturday, cloudy periods and northwesterlies developing. And on Sunday, showers and a cool southwest change.