Bulletin d’avalanche

Ohau

New Zealand Avalanche Advisory
Voir sur la carte

Danger d’avalanche

High Alpine · above 1,800 m
1 · Faible
Alpine · 1,200 m–1,800 m
1 · Faible
Sub Alpine · below 1,200 m
1 · Faible
Open full map
Périmé — ce bulletin a expiré last month. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Afternoons will warm up after a cold start. This may rise the likelihood of small loose wet avalanching in steep solar terrain.

A small avalanche could have nasty consequences with a minefield of shallowly buried rocks about.

Problèmes avalancheux

  • Loose Wet

    • Toutes altitudes
    Probabilité
    Unlikely
    Taille
    1

    A cycle of loose wet avalanching has already taken place. Small loose wet avalanches are possible through the warmth of the afternoon on steep sunny slopes.

  • Wind Slabs

    • Toutes altitudes
    Probabilité
    Unlikely
    Taille
    1.5

    Several pulses of SE snow and wind have come through over the first half of the week. Several layers of windslab may be present as well as a buried rime crust. We suspect a reasonable bond of any layers but the snowpack is generally unobserved in the Ohau back country. I would be taking my time and having a look at the structure and strength of recent snowfall, as well as what might lie in the runout, ie, rocks!

Recent Avalanche Activity

Ohau ski patrol report several small loose wet avalanches, size 1, on E aspects on the 9th.

Current Snowpack Conditions

Approximately 90cm of new snow has fell in the Ohau area over the early half of the week at 1800m, tapering to around 45cm at 1500m. The stormy period finished with up to 30cm of new snow on Wednesday with moderate SE winds. Windslab development will be mostly restricted to higher elevation slopes lee to the recent SE winds. Many slopes are only just getting to threshold for avalanching and many rocks will be lurking. Two rime crusts are buried around 20cm -30 cm below surface, but the depth is variable depending on local wind effect. Direct solar slopes will have some degree of melt freeze crust, and facetting has been observed below this crust, while surface hoar has been developing on shadey slopes.

Mountain Weather

Fine and frosty with winds trending NW later on Sunday. Freezing level around 1500m.

Sliding Danger

Probably not much of sliding hazard at present, though there maybe firm snow exposed at ridgelines and solar slopes will have a melt freeze crust.

Forecast Confidence

Moderate

  • We are confident due to a stable weather pattern.
  • We are uncertain due to a limited number of field observations.

New Zealand Avalanche Advisory (NZ Mountain Safety Council)

Régions couvertes