Bollettino valanghe

Tongariro

New Zealand Avalanche Advisory
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Pericolo valanghe

High Alpine · above 2,300 m
3 · Marcato
Alpine · 1,800 m–2,300 m
2 · Moderato
Sub Alpine · below 1,800 m
2 · Moderato
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Non aggiornato — questo bollettino è scaduto 2 months ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Wind slabs have formed; wind and snowfall continued to affect the region over the past 24 hours. This hazard is located on North and west-facing slopes above 1600 metres. A low-pressure system affects the region, bringing strong winds and snow showers tomorrow morning. Improvement later.

Problemi valanghivi

  • Wind Slabs

    • Tutte le quote
    Probabilità
    Likely
    Dimensione
    2.5

    Wind slabs have continued to form. Blizzard conditions have impacted the region throughout today, Thursday, the 9th of July. This has increased the sensitivity and size of deposits. Triggering by natural events such as rock and icefall is likely. The existing anchors have progressively been buried, increasing the reactivity of these wind slab deposits. Weaknesses exist within the new snow and at the interface between new and old snow. It is advisable to avoid any newly formed slabs that have a convex shape and lack proper support.

Recent Avalanche Activity

No natural or human-triggered avalanche activity has been observed or reported over the previous 24 hours. The weather and visibility have been poor, making comprehensive observations difficult to achieve.

Current Snowpack Conditions

For a short period of time, the new snow accumulation has been significant. Over the past 24 hours an estimated 30 cm in the northern areas with 40 cm in the southwest. The transported deposits will be significant. This new snow was transported to the north and west aspects, forming large deposits. Field observations have been limited due to the poor weather, making travel dangerous. The wind slab will be large with a high volume. A crust formed at Turoa today before the next pulse started to bury it. Weaknesses are present within these deposits. The threshold has lowered over the previous 24 hours. Isolated start zones above 1700 metres have enough snow for avalanches to run.

Mountain Weather

Tomorrow, the 9th of July, rain, possibly heavy in the morning, then easing in the afternoon. Snow lowering to 900 metres in the morning. Southeasterly gale rising to severe gale early morning, then easing to southerly gale in the evening. Over the next 24 hours, the freezing level will lower from 1800 metres to 1300 metres. A deep low northeast of New Zealand moves slowly east today, bringing strong southeast flow over central New Zealand, while a cold front reaches the lower South Island. Tomorrow, a ridge builds over the South Island, while the strong southeast flow over central and northern New Zealand starts to ease.

Sliding Danger

Gale-force winds have stripped exposed slopes. Expect hard, icy surfaces. Travel will require good technique and proper equipment.

Forecast Confidence

Moderate

  • We are uncertain due to a limited number of field observations.
  • We are uncertain about forecast snowfall amounts.

New Zealand Avalanche Advisory (NZ Mountain Safety Council)

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