North Island

    Forecast DateUpper NI
    NIMT
    AK
    NIMT, ECMT, Auckland
    BOP
    ECMT
    West NI
    NIMT, PNGL, MNPL
    East NI
    PNGL, WRAPA
    WN
    NIMT, WRAPA, Wellington
    See forecast details below
    Mon 18 Jan
    No longer relevant
    Tue 19 Jan
    An active front approaches the North Island from the west. 1. [Strong northwest wind gusts 120+ km/h for a time for the WN region and East NI about and south of Dannevirke.] Also northwest wind gusts 80+ km/h affect many parts of the North Island for a time evening/Tues night. 2. Rain picks up for western areas later with totals reaching 25 mm by midnight for the area Taumaranui to National Park, for Taranaki, and in the area from Foxton to Kapiti.
    Wed 20 Jan
    1. Rain eases early Wed. Expect another 25 mm for the area Taumaranui to National Park, Taranaki, and in the area from Foxton to Kapiti. 2. Strong west-northwest wind gusts 100+ km/h south of a line Te Kuiti to Wairoa. [Risk of 120+ km/h gusts about and east of the Manawatu Gorge.]
    Thu 21 Jan
    Strong westerly wind gusts (80+ km/h) about and east of the Manawatu Gorge, eases during the day.
    Fri 22 Jan
    No significant weather.

    South Island

    Forecast DateWest Coast
    MIDLND, SNL, HKTKA
    Upper SI
    MNL, MIDLND, Christchurch
    Lower SI
    MSL
    See forecast details below
    Mon 18 Jan
    No longer relevant
    Tue 19 Jan
    An active weather system crosses the South Island. 1. Strong wind gusts 100 km/h for many places, including West Coast. [Risk of gusts 120+ km/h for inland MIDLND line east of Arthurs Pass, for Marlborough and Southland.] 2. [Heavy rain for West Coast with another 150+ mm for inland MIDLND line west of Arthurs Pass], and 50 to 100 mm for other parts of West Coast. Expect 25+ mm for inland MIDLND line west of Springfield, and for west parts of Southland. 3. Keep at watch on Rangitata, Rakaia and Waimakariri River levels from later today.
    Wed 20 Jan
    1. Gusty westerly wind conditions for most places with gusts 80+ km/h. [Risk of 120+ km/h for Southland, esp. near south coast.] 2. Showery for West Coast and Southland with totals 25 to 40 mm here.
    Thu 21 Jan
    1. Westerly wind gusts 80+ km/h near Southland south coast slowly ease. 2. Showery for the lower South Island with totals 25+ mm for much of Southland.
    Fri 22 Jan
    No significant weather.

Colour Key

Non-impacting weather expected
Active weather - but with minimal impact expected (see comments). Note that -active weather- is based on 24-hour rainfall totals >25 mm, wind gusts >80 km/h, and snow accumulation >5 cm etc.
Significant weather expected - potential for impacts on network at some locations (see underlined comments). Additional email updates to be issued with focus on high risk areas.
Significant weather expected - potential for widespread impacts on network (see underlined bold comments). Additional email updates to be issued with focus on high risk areas.