Lawinenlagebericht

Tongariro

New Zealand Avalanche Advisory
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Lawinengefahr

High Alpine · above 2,300 m
1 · Gering
Alpine · 1,800 m–2,300 m
1 · Gering
Sub Alpine · below 1,800 m
1 · Gering
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Kernpunkte

Loose wet avalanche activity cannot be ruled out on steep slopes being impacted by direct sun. The surface snow will lock up with an overnight refreeze as it moves into a melt-freeze cycle. The chance of an uncontrolled slide will increase. Recommend a considered assessment of the surface conditions before committing to an ascent.

Lawinenprobleme

  • Loose Wet

    • Alle Höhenlagen
    Wahrscheinlichkeit
    Unlikely
    Größe
    1

    Loose wet avalanche activity on solar aspects. Over the next 24 hours, the sun's radiation may reduce the structural integrity of the surface layer. During the warmest period of the day, steep slopes with a solar aspect may become prone to loose wet avalanche activity. Increasing winds may have a cooling effect, limiting surface breakdown. Visibility will be good over the next 24 hours, benefitting slope assessment and navigation. Plan your route with aspects and time of day in mind. Watch for signs of a developing surface instability, such as roller ball and point release below cliff bands. Monitor foot penetration and cloud cover as you travel.

Recent Avalanche Activity

No avalanche activity has been reported or observed over the past 24 hours.

Current Snowpack Conditions

Surface snow was partially saturated by rain during the last storm cycle. Snowpack is now moving into a melt- freeze cycle. No significant weaknesses currently exist; however, some isolated facet layers have been noted on shady aspects. An overnight refreeze of the surface snow occurred, locking up the snowpack, creating a consolidated mass. Snow cover exists on Mt Ngauruhoe and Mt Tongariro. If doing the Tongariro Crossing, you will be traveling over snow and ice with start zones at threshold. Recommend alpine gear and take avalanche precautions. Threshold elevation is about 1600 metres.

Mountain Weather

Wednesday the 12th of August will be mainly fine. Some cloud about the tops from late afternoon. The winds are light easterly, tending northeast and increasing during the day. The freezing level is at 2600 metres, lowering to 2300 metres over the next 24 hours. Today, Tuesday, a thin ridge covering the country slowly shifts east as a broad trough and its associated front approach from the west. Tomorrow, the front moves eastwards onto the country, followed by the broad trough. Meanwhile, a slim ridge becomes slow-moving to the northeast of the North Island.

Sliding Danger

An overnight refreeze is likely tonight; the surface will be slick and icy. Wind-stripped ridgelines and windward terrain features will have a hard, icy surface. Numerous hazards, such as exposed rocks and cliff bands, remain. Carrying an ice axe and crampons is recommended in the backcountry. It is essential to have strong alpine skills and competence when travelling over slick surfaces with high consequences.

Forecast Confidence

High

  • We have a good understanding of the snowpack structure and confidence in the weather forecast.

New Zealand Avalanche Advisory (NZ Mountain Safety Council)

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