Bollettino valanghe

Aoraki/Mt Cook

New Zealand Avalanche Advisory
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Pericolo valanghe

High Alpine · above 2,000 m
3 · Marcato
Alpine · 1,500 m–2,000 m
3 · Marcato
Sub Alpine · below 1,500 m
3 · Marcato
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In sintesi

Heavy snowfall and strong NW winds are forecast over the weekend.

Large natural avalanches are likely where rain falls onto the existing snowpack, while heavy snowfall and strong winds rapidly load slopes.

Travel in avalanche terrain is not recommended this weekend.

Stay well clear of avalanche paths and runout zones.

Problemi valanghivi

  • Wind Slabs

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    Probabilità
    Likely
    Dimensione
    2.5

    The wind slab problem is expected to increase as heavy snowfall and strengthening NW winds affect the region over the weekend.

    Up to 1 m of new snow is possible near the Main Divide. This new snow will fall onto well-developed near-surface facets, wind-pressed snow, or slick melt-freeze crust, creating potential weak layers and poor bonding.

    Large avalanches are likely. Stay clear of avalanche paths and avoid travelling through or beneath avalanche terrain.

  • Loose Wet

    • Tutte le quote
    Probabilità
    Likely
    Dimensione
    2

    Loose wet avalanches are possible where precipitation falls as rain onto the existing snowpack.

    These avalanches can be large, heavy, and destructive. Stay clear of avalanche paths and avoid travelling beneath steep slopes.

    The problem is expected to decrease as temperatures drop on Sunday.

Recent Avalanche Activity

Limited observations due to low cloud and precipitation.

Current Snowpack Conditions

Estimated 40 cm of new snow fell above 1800 m at Tasman Saddle, accompanied by strong NW winds. Snowfall amounts tapered significantly towards the eastern part of the region. Snowfall is expected to intensify on Sunday morning, with a further 50 cm of new snow possible.

The new snow fell onto a variety of underlying surfaces, including wind-pressed snow, near-surface facets, and slick melt-freeze crust. There is uncertainty about how well the new snow is bonding to these old surfaces.

West-facing slopes and exposed ridges have been stripped back to firm surfaces by severe NW gales.

Mountain Weather

Heavy rain, turning to showers with possible squally thunderstorms and hail in the morning as snow lowers to 600 metres, easing in the evening.

Wind at 1000 metresWesterly severe gale 120 km/h, easing to gale 80 km/h in the afternoon.

Wind at 2000 metresWesterly severe gale 130 km/h, easing to southwesterly severe gale 90 km/h in the afternoon.

Wind at 3000 metresWesterly severe gale 150 km/h, easing to southwesterly severe gale 100 km/h in the afternoon

Freezing level2000 metres, lowering to 1000 metres in the morning.

Sliding Danger

Firm snow conditions exist on west-facing slopes and near ridgelines due to strong winds. Ice axe and crampons are necessary for travel above the snowline.

Forecast Confidence

Moderate

  • We are uncertain about forecast precipitation amounts.
  • We are uncertain due to rapidly changing freezing levels.

New Zealand Avalanche Advisory (NZ Mountain Safety Council)

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