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Weather Warning


SEVERE WEATHER WARNING.
ISSUED BY MetService AT 9:07am 04-May-2016
URGENT - IMMEDIATE BROADCAST IN: Westland, Fiordland, Southern Lakes,
Canterbury High Country, Nelson

BURST OF HEAVY RAIN FOR NORTHERN FIORDLAND, SOUTHERN WESTLAND, THE
NORTHWEST NELSON RANGES AND THE HEADWATERS OF OTAGO AND CANTERBURY.
A broad trough is expected to move over the lower South Island this
evening (Wednesday), then progress on to the lower North Island
during Thursday morning, before weakening. A humid northerly flow
precedes the trough, bringing a burst of heavy rain to northern
Fiordland, southern Westland and the headwaters of Otago and
Canterbury today (Wednesday), then to the Northwest Nelson Ranges
tonight and Thursday morning. The largest accumulations are expected
to be about the ranges of Westland from Otira southwards, where 150
to 200mm could accumulate over a 24 hour period.
People are advised that streams and rivers are likely to rise rapidly
and slips are possible in vulnerable areas.
FOR THE LATEST WEATHER AND FORECAST CHARTS PLEASE GO TO
http://metservice.com
MORE DETAILED INFORMATION FOR EMERGENCY MANAGERS AND TECHNICAL USERS
FOLLOWS.
______________________
HEAVY RAIN WARNING
______________________
AREA/S AFFECTED: WESTLAND FROM OTIRA SOUTHWARDS
FORECAST:
Heavy rain is expected to clear early Thursday morning. In the 21
hours from 9am today to 6am Thursday expect a further 150 to 200mm
about the ranges and 60 to 90mm closer to the coast. Peak intensities
of 20 to 30mm per hour Wednesday afternoon and evening.
FREEZING LEVEL: 3000 metres.
AREA/S AFFECTED: FIORDLAND NORTH OF DOUBTFUL SOUND
FORECAST:
Heavy rain is expected to clear tonight (Wednesday). In the 15 hours
from 9am to midnight Wednesday expect a further 80 to 100mm to
accumulate. Peak intensities of 15 to 20mm per hour this afternoon.
FREEZING LEVEL: 3000 metres.
AREA/S AFFECTED: HEADWATERS OF THE OTAGO LAKES AND RIVERS
FORECAST:
Heavy rain is expected to clear tonight. In the 12 hours from 9am to
9pm Wednesday expect 70 to 100mm with 15km of the Divide, with 120mm
likely close to the Divide. Peak intensities 10 to 15mm per hour
during the afternoon, with up to 20mm per hour likely close to the
Divide.
FREEZING LEVEL: 3000 metres.
AREA/S AFFECTED: CANTERBURY HEADWATERS, ABOUT AND SOUTH OF THE
WAIMAKARIRI RIVER
FORECAST:
Burst of heavy rain is expected to spread over the Divide from
Wednesday afternoon until early Thursday morning. In the 15 hours
from midday today (Wednesday) until 3am Thursday expect 80 to 100mm
within 15km of the Divide with 120 to 150mm likely close to the
Divide. Peak intensities 10 to 15mm per hour Wednesday evening and
early Thursday morning, with 20 to 30mm per hour likely near the
Divide.
FREEZING LEVEL: 3000 metres.
AREA/S AFFECTED: THE NORTHWEST NELSON RANGES
FORECAST:
Burst of heavy rain expected tonight and Thursday morning. In the 12
hours from midnight tonight (Wednesday) until midday Thursday expect
80 to 100mm to accumulate. Peak intensities 10 to 15mm per hour
during Thursday morning.
FREEZING LEVEL: 3200 metres.
NEXT SEVERE WEATHER WARNING WILL BE ISSUED AT OR BEFORE
9:00pm Wednesday 04-May-2016
Forecast prepared by: Leigh Matheson
For further information after 1pm Wednesday 4 May contact Duty
Forecaster Rochelle Fleming
A service provided through a contract with the Crown

Short Range Forecast

201605052359

Northland to Whanganui, including Bay of Plenty and the central high country: Fine and cloudy periods, with the odd shower, especially tomorrow. Areas of morning fog south of Auckland.
Gisborne, Hawkes Bay and Wairarapa: Increasing high cloud. Scattered rain about Wairarapa and southern Hawkes Bay tomorrow.
Manawatu to Wellington: Cloudy periods and the odd shower today. Rain developing tomorrow morning, possibly heavy for a time, then easing later.
Nelson and Marlborough: Rain developing this evening. Some heavy falls overnight and tomorrow morning, then easing.
Canterbury, Otago and Southland: Rain developing this afternoon or evening, but only patchy falls in Canterbury. Fine or becoming fine tomorrow.
Buller, Westland and Fiordland: Rain with some heavy falls, clearing in the south overnight, but a few showers remaining in Buller and northern Westland tomorrow.
Chatham Islands: Fine today. Occasional rain developing tomorrow.

Extended Forecast

201605072359

Friday: North Island, some rain or showers for most, easing later. Dry in the east with high cloud. South Island, occasional rain in the northwest, clearing at night. Drizzle for Fiordland, then late rain. Mainly fine elsewhere, but morning low cloud or fog.
Saturday: North Island, the odd shower in the far north and east. Showers clearing elsewhere and becoming fine. South Island, early heavy rain for Fiordland, then a few showers. Showers developing in southern Westland, Southland and Clutha. Mainly fine elsewhere.
Sunday: Mainly fine, but one or two showers in the far north and east of the North Island and for southern Westland and Fiordland.
Chatham Islands: On Friday, cloudy periods, with northerlies developing. On Saturday, often cloudy, with a few showers developing at night. Northwesterlies changing southwest overnight. On Sunday, few morning showers, then fine. Southerlies dying out.

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