SEVERE WEATHER WARNING.
ISSUED BY MetService AT 8:36am 06-Mar-2015
URGENT - IMMEDIATE BROADCAST IN: Nelson, Buller, Westland,
BURST OF HEAVY RAIN EXPECTED ABOUT WESTLAND AND THE ALPS, BULLER,
NELSON AND MOUNT TARANAKI.
THE WARNING FOR HEAVY RAIN ABOUT THE RANGES OF NORTHWEST NELSON HAS
NOW BEEN EXTENDED TO COVER THE ENTIRE NELSON REGION IN THIS ISSUE.
Heavy rain is now expected across the entire Nelson region, not just
the ranges of Northwest Nelson. All other areas remain unchanged in
this issue but will be updated by midday today.
An active front, preceded by a strong moist northerly flow, moves
east over the South Island this morning, then the North Island this
afternoon and early evening. A period of heavy rain is expected with
this front, especially about Nelson, Buller, Westland and the Alps,
where hourly rainfalls could reach 30 to 50mm/hr with possible
thunderstorms. Rainfall accumulations could approach 180mm about the
Westland ranges and Alps in a 9 to 12 hour period, with 100mm
expected about remaining parts of Westland, including the Paparoa
Range, Canterbury Headwaters, Northwest Nelson and Mt Taranaki. In
addition 60 to 90mm is expected in a 5 hour period about Buller and
the remainder of Nelson.
This is a significant amount of rain over a short period of time;
streams and rivers could rise very rapidly, with surface flooding and
hazardous driving conditions.
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HEAVY RAIN WARNING
AREA/S AFFECTED: WESTLAND, INCLUDING THE PAPAROA RANGE
Rain is expected to become heavy from tonight (Thursday to Friday).
In the 12 hours from midnight tonight to midday Friday, expect 70 to
100mm to accumulate north of Haast, but 120 to 180mm about the
ranges. Peak intensities of 25 to 40mm/hr in thunderstorms during
FREEZING LEVEL: 3000 metres lowering to 2400 metres this morning.
AREA/S AFFECTED: NELSON
Heavy northerly rain is expected to continue until 1pm today. In the
5 hours from 8am until 1pm Friday, another 70 to 100mm of rain is
likely about Northwest Nelson with 50 to 80mm about the remainder of
Nelson. Peak intensities of 30 to 50mm/hr, with thunderstorms
FREEZING LEVEL: 3200 metres
AREA/S AFFECTED: CANTERBURY HEADWATERS
Rain is expected to become heavy about the Alps Friday morning, with
significant spillover into the headwaters. In the 9 hours from 5am to
2pm Friday, expect 100 to 150mm to accumulate near the Divide, with
70 to 100mm within 30km east of the Divide. Peak intensities 20 to
30mm/h in thunderstorms near the Divide during Friday morning.
FREEZING LEVEL: About 3400 metres lowering to 2400 metres late
morning/early afternoon Friday.
AREA/S AFFECTED: MOUNT TARANAKI
Rain is expected to become heavy about the Mountain late Friday
morning. In the 6 hours from 10am to 4pm Friday, expect 70 to 100mm
to accumulate. Peak intensities 15 to 25mm/hr in thunderstorms Friday
AREA/S AFFECTED: BULLER
Heavy rain is expected to continue until midday today. In the 5 hours
from 7am until midday, another 60 to 90mm of rain is likely on top of
what has already fallen this morning. Peak intensities of 30 to
50mm/hr, with thunderstorms possible.
FREEZING LEVEL: 3200 metres lowering to 2800 metres early afternoon.
NEXT SEVERE WEATHER WARNING WILL BE ISSUED AT OR BEFORE
9:00pm Friday 06-Mar-2015
Forecast prepared by: Peter Little
A service provided through a contract with the Crown
Short Range Forecast
Northland to Wellington, including Bay of Plenty and the central high country:Rain spreading east this afternoon, possibly thundery in Taranaki and Waitomo, becoming confined to eastern Bay of Plenty tonight. Rain developing from the west tomorrow, some heavy with thunderstorms south of Auckland, easing to isolated showers in the north later.
Gisborne, Hawkes Bay, Wairarapa: Mainly fine, but brief rain south of Hastings today, then scattered showers from tomorrow afternoon.
Marlborough, Nelson, Buller, Westland, also Canterbury High Country: Heavy rain, with thunderstorms possible in the west, clearing this afternoon. Rain with heavy thundery falls developing tomorrow morning, easing to showers later.
The remainder of Canterbury, Otago and Southland: Scattered rain clearing this afternoon. Scattered showers tomorrow, turning to rain in Otago and Southland later.
Fiordland: Showers clearing this afternoon. Heavy rain developing tonight, easing to isolated showers tomorrow.
Chatham Islands: Becoming cloudy, with showers developing tonight.
Sunday: North Island, A few morning showers for most places then fine spells. South Island, Showers clearing east of the divide in the morning. However,isolated afternoon showers about inland Canterbury.
Monday: North Island, showers developing in the west from Taranaki to Wellington. Mainly fine elsewhere. South Island, a few showers in the south and west. Mainly fine elsewhere.
Tuesday: North Island, mainly fine apart from a few showers in the west south of Auckland. South Island, Showers for most places, becoming heavy in the west but remaining fine in the north.
Chatham Islands: Rain, briefly heavy with strong northerlies, changing westerly and easing to showers Sunday morning. Showers clearing on Monday and westerlies easing. Fine spells on Tuesday and northerlies developing.