SEVERE WEATHER WARNING.
ISSUED BY MetService AT 9:12am 15-Feb-2016
URGENT - IMMEDIATE BROADCAST IN: Fiordland, Westland
PERIODS OF HEAVY RAIN FOR FIORDLAND. SIGNIFICANT HEAVY RAIN FOR
WESTLAND ON WEDNESDAY.
A front is expected to stall over southern Fiordland today (Monday),
then should drift southwards Tuesday morning. A moist northerly flow
is expected to persist over Fiordland and Westland until a complex
trough crosses these areas Wednesday afternoon and evening.
The heaviest rain is expected to be about the ranges of Westland,
where 300 to 400mm could accumulate from late Tuesday until late
Wednesday. Meanwhile, over 100mm of rain is possible about coastal
areas during this time. This is a significant amount of rain for a 24
hour period in this region.
In Fiordland, periods of heavy rain are expected from Monday
afternoon though to late Wednesday afternoon and 250 to 350mm of rain
People are advised that streams and rivers will rise rapidly, slips
and surface flooding are possible and tramping and driving conditions
will be hazardous.
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HEAVY RAIN WARNING
AREA/S AFFECTED: FIORDLAND
Rain is expected to become heavy Monday afternoon, with embedded
thunderstorms, and should ease Tuesday morning before becoming heavy
again late Tuesday afternoon. Heavy rain and thunderstorms should
ease when a trough crosses the area late Wednesday afternoon.
In the 21 hours between midday Monday and 9am Tuesday, 100 to 150mm
could accumulate, with peak intensities of 15 to 20mm per hour. The
second period of heavy rain is expected to be in the 26 hours between
4pm Tuesday and 6pm Wednesday, when 150 to 200mm could accumulate,
with peak intensities of 25 mm per hour.
FREEZING LEVEL: Above 3000 metres.
AREA/S AFFECTED: WESTLAND
Rain is expected to become heavy Tuesday evening, with embedded
thunderstorms, and should ease Wednesday night. In the 24 hours
between 9pm Tuesday and 9pm Wednesday, 300 to 400mm of rain could
accumulate about the ranges, with 100 to 120mm forecast for coastal
areas. Peak intensities of 30mm per hour on Wednesday.
FREEZING LEVEL: Above 3000 metres.
NEXT SEVERE WEATHER WARNING WILL BE ISSUED AT OR BEFORE
9:00pm Monday 15-Feb-2016
Forecast prepared by: Rochelle Fleming
A service provided through a contract with the Crown
Short Range Forecast
Northland, Auckland, Waikato, Coromandel, Bay of Plenty, Taupo and northern Gisborne: Often cloudy, with a few showers.
The remainder of Gisborne, also Horowhenua, Kapiti Coast and Wellington: Fine with high cloud.
Waitomo, Taumarunui, Taranaki, Wanganui, Taihape, Manawatu, Hawkes Bay and Wairarapa: Mainly fine and warm. Isolated afternoon and evening showers, mainly about the ranges.
Nelson, Buller and Westland: Cloudy periods with isolated showers, turning to rain tomorrow with heavy falls possible, especially about the ranges.
Fiordland: Rain, heavy at times with thunderstorms possible.
Marlborough and Canterbury: Mostly sunny and warm. Showers about the Marlborough Sounds and Richmond Range tomorrow.
Otago: Cloudy periods. Isolated afternoon and evening showers, especially today when some could be thundery.
Southland: Scattered rain, with thunderstorms possible this afternoon and evening, clearing overnight and becoming fine. However, isolated showers tomorrow afternoon and evening.
Chatham Islands: Cloudy periods.
Wednesday: North Island, showers north of Taihape, high cloud elsewhere. Rain in the west from evening. Northerlies rising to severe gale about exposed higher parts. South Island, heavy, possibly thundery rain in the west and north,and scattered falls spreading elsewhere from afternoon. Northerlies, rising to severe gale in exposed places.
Thursday: Periods of rain, but only scattered falls for eastern areas. Heavy falls for North Island high country and western South Island.Severe gale northerlies about exposed high parts of the North Island and upper South Island.
Friday: Rain in the north and west of both islands easing, then clearing for North Island. Early rain in the east, otherwise fine. Severe gale northwesterlies about higher areas of the North Island, easing.
Chatham Islands: Fine spells Wednesday. Rain developing Thursday, possibly heavy for a time Friday, before easing to showers. Northeasterlies, strengthening Wednesday, rising to gale Friday, turning lighter northwest late Friday.