Wind Slabs
- All elevations
- Likelihood
- Unlikely
- Size
- 1
A dusting of snow and wind from the south on Saturday and again yesterday may have seen new pockets of wind slab develop at higher elevations on slopes lee to the south quarter.
Avalanche forecast
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New Zealand Avalanche Advisory
Avalanche danger
- High Alpine · above 2,000 m
- 1 · Low
- Alpine · 1,500 m–2,000 m
- 1 · Low
- Sub Alpine · below 1,500 m
- 1 · Low
Out of date — this forecast expired last week. You’re viewing past conditions, not the current bulletin.
Highlights
With recent rain falling up to 1900m saturating the snow pack and cold temperatures forecast for the day there will a high sliding hazard at mid and lower elevations. Carry an ice axe and crampons. Above 1900m there was fresh snow with NW and then Southerly winds. There may remain isolated pockets of unstable wind slab in steeper terrain.
Avalanche problems
Recent Avalanche Activity
On the 14th wet slab and loose wet avalanches were observed at mid and lower elevations due to the a warm wet cycle. Above 1900m isolated natural wind slab activity was observed in pockets of steeper terrain on slopes lee to the west.
If you see any recent avalanche occurrences or have any relevant snowpack information or photos, you can share them via the Public Observations link on the NZAA home page.
Current Snowpack Conditions
Above 1900m: There was a dusting of snow Saturday accompanied by moderate southerly winds. Approximately 15-40cm of new snow fell from Tuesday to Thursday. This snow has largely bonded well to the old snow surface and the upper and mid pack are generally showing settled characteristics as total snow depths have increased and with warmer temperatures recorded. With the very strong winds experienced throughout the winter there is a high degree of spatial variability in the distribution of snow and there are still areas of unusually shallow snowpack at all elevations. The lower part of the snowpack appears consolidated and unreactive. Large cornices have also formed above 1800m.
Below 1900m rain has saturated the snow pack turning it isothermic. With colder temperatures there is a very slick snow surface.
Caution should still be taken, particularly in steeper, more extreme terrain where unknown weaknesses may exist.
Mountain Weather
Wind at 1000 metres: Southerly 45 km/h, but gale 65 km/h in exposed places until mid morning.
Wind at 2000 metres: Southerly gale 80 km/h, easing to 60 km/h for a time this afternoon.
Wind at 3000 metres: Southerly severe gale 90 km/h, easing to gale 70 km/h this morning, then to 50 km/h this evening.
Freezing level: 1400 metres, lifting to 1700 metres at night.
Sliding Danger
Rain has fallen to 1900m creating a very slick frozen snow surface which with cold temperatures will present a sliding hazard all day. Take care. An ice axe and crampons could be necessary.
Forecast Confidence
High
- The snowpack structure is well understood.
- We have a good understanding of the snowpack structure and confidence in the weather forecast.
New Zealand Avalanche Advisory (NZ Mountain Safety Council)