Bollettino valanghe

Fiordland

New Zealand Avalanche Advisory
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Pericolo valanghe

High Alpine · above 1,800 m
1 · Debole
Alpine · 1,200 m–1,800 m
1 · Debole
Sub Alpine · below 1,200 m
Senza grado
Non aggiornato — questo bollettino è scaduto last week. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

A high sliding hazard. The wet snowpack, from the heat and rain last week, has refrozen as temperatures dropped. Expect very icy surface conditions, possibly as high as 2200m.

Watch for any small pockets of wind slab which may remain, at higher elevations.

Problemi valanghivi

  • Wind Slabs

    • Tutte le quote
    Probabilità
    Possible
    Dimensione
    1.5

    Small pockets of wind slab may remain at the highest elevations. This is most likely on the steep ground near the ridgetops or in steep gullies. Loose dry activity may also be an issue in very steep terrain holding new or dry snow.

Recent Avalanche Activity

Wed 13 Aug - A series of avalanching (unsure of type) off Mt Talbot observed in the afternoon.

Tuesday 12 Aug - Loose wet activity observed on all sunny aspects throughout the Darran Mountains

Sun 9th Aug- Some wet loose activity reported during rain in the Gertrude Valley area.

Current Snowpack Conditions

14 -15th August - Expect a melt freeze crust on all aspects,2100m (perhaps 2200m) and below

12- 13th August - About 20-30cm above 2000m and rain below (45mm). The freezing level has been around 1800 -2200m for the last 48 hours.

Fri 7th to Sun 9th. Up to 25cm fell in above about 1700m in northern Fiordland. Expect some slab development in the steep ground near ridgetops. Below about 1700m expect a lattice of rain crusts or even rain-soaked snow at the very low elevations.

Above 1800 this snow overlies a snowpack that is thought to be stable. It is expected to have layers but has been tested by strong wind loading and wind stripping from both the west and the SE in early August.Below 1800 new snow overlies a thin snowpack has had rain on it at the beginning of pretty much all the winter storms, and is thought to be well stable.

Mountain Weather

Occasional showers, with snow to 1100 metres.

Wind at 1000 metres

Southwesterly 30 km/h, rising to 50 km/h in the evening.

Wind at 2000 metres

Southwesterly 35 km/h, rising to 55 km/h in the morning.

Freezing level

1000 metres, lifting to 1400 metres in the morning.

Sliding Danger

A refreeze of the wet snowpack has taken place, to high elevations, on all aspects. Take an axe and crampons if you're exploring.

Forecast Confidence

Moderate

  • We are uncertain due to a limited number of field observations.
  • We are uncertain due to variable freezing levels.

New Zealand Avalanche Advisory (NZ Mountain Safety Council)

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