SEVERE WEATHER WARNING.
ISSUED BY MetService AT 8:26pm 01-Dec-2015
URGENT - IMMEDIATE BROADCAST IN: Westland
PERIODS OF HEAVY RAIN FOR THE RANGES OF WESTLAND DURING TUESDAY,
WEDNESDAY AND THURSDAY.
Fronts embedded in a moist northwesterly flow are expected to bring
periods of heavy rain to the west of the South Island tonight and on
Wednesday. On Thursday, another front is expected to move northeast
over the South Island bringing a further burst of heavy rain to the
west. The largest accumulations are expected for the ranges of
Westland south of Otira where a total of 250 to 350mm could
accumulate from Tuesday morning to Thursday evening.
This amount of rain may cause rivers and streams to rise rapidly and
localised surface flooding.
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: THE RANGES OF WESTLAND SOUTH OF OTIRA
Heavy rain is expected to ease Wednesday morning. In the 9 hours from
9pm Tuesday to 6am Wednesday expect a further 80 to 130mm of rain to
accumulate with the largest amounts about higher parts of the Alps.
Peak intensities of 10 to 15mm per hour.
Another burst of heavy rain is expected from Wednesday evening to
Thursday evening. In the 24 hours from 9pm Wednesday to 9pm Thursday
a further 150 to 200mm of rain may accumulate. Peak intensities 15 to
25mm per hour during Thursday afternoon.
FREEZING LEVEL: About 3500 metres.
NEXT SEVERE WEATHER WARNING WILL BE ISSUED AT OR BEFORE
9:00am Wednesday 02-Dec-2015
Forecast prepared by: Leigh Matheson
For further information after 9pm Tuesday 1 December contact Duty
Forecaster John Crouch or Micky Malivuk
A service provided through a contract with the Crown
Short Range Forecast
Northland and Coromandel Peninsula: Cloudy periods, with a few light showers this morning.
Auckland to Taranaki, also Bay of Plenty and Hawkes Bay: Mostly cloudy.
Gisborne: Fine with high cloud.
Central high country, Wanganui and Manawatu: Mostly cloudy, with afternoon and evening showers mainly inland, some heavy.
Horowhenua to Wellington, also Wairarapa: Mostly cloudy, patchy drizzle mainly about the ranges, clearing morning or afternoon.
Marlborough and Nelson: Occasional rain, mostly clearing in Marlborough this morning apart from the Sounds.
Buller, Westland and Fiordland: Periods of rain, heavy at times.
Canterbury, Otago and Southland: Fine and warm. Isolated afternoon and evening showers for eastern areas of Otago.
Chatham Islands: Cloudy periods.
Thursday: North Island, cloudy periods and a few showers in the west. South Island, rain with heavy falls in the west, easing to showers from the south. A brief period of rain spreading northwards in the east.
Friday: North Island, rain or showers with most places. South Island, few showers in the south and west. Early showers in the east then fine.
Saturday: North Island, rain or showers with most places. South Island, rain or showers in the south and west. Rain spreading north in the east.
Chatham Islands: Cloudy periods with the odd shower and strong or gale northerlies on Thursday. On Friday, periods of rain with gale northwesterlies dying out. Rain or showers with westerlies on Saturday.