New Zealand Mountan Safety Council

Tongariro

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Issued at 23/08/2017 2:36pm. Valid till 24/08/2017 6pm

Tongariro

Mountain
Current avalanche advisory
High Alpine

Above 2000 meters

Alpine

1000 to 2000 meters

Sub Alpine

Below 1000 meters

Avalanche Danger Scale
Avalanche Danger Scale
Report TutorialPrint Reporthear report

Primary Avalanche Danger

Dangerous Aspects
high
Danger Rose
2
Highest Danger Rating
Likelihood
indicator
gauge
Certain
Likely
Unlikely
Size
indicator
gauge
Largest
Small
Trend
indicator
gauge
Increasing
No change
Decreasing
Time of day
clock
Time of day
All day
Alpine level
High Alpine: Above 2000m
Alpine: 1000 to 2000m
Low Alpine: Below 1000m
Description:
A MODERATE danger exists for cornice fall above 2000m on the aspects highlighted on the rose. Very large and sensitive cornice can be found across the region. Many of these cornices have more mass than a car and have failed by simply skiing up to the edge. Be aware that the cornice may fracture well back from the edge potentially dragging you into very hazardous terrain amongst large dense debris. It has also proven to be a very effective trigger for lingering wind slab below. This hazard is easy to avoid during periods of good visibility. Weak terrain familiarization coupled with poor visibility will be a recipe for disaster. It is worth while staying well away from large cornice lines.

Secondary Avalanche Danger

Dangerous Aspects
high
Danger Rose
2
Highest Danger Rating
Likelihood
indicator
gauge
Certain
Likely
Unlikely
Size
indicator
gauge
Largest
Small
Trend
indicator
gauge
Increasing
No change
Decreasing
Time of day
clock
Time of day
All day
Alpine level
High Alpine: Above 2000m
Alpine: 1000 to 2000m
Low Alpine: Below 1000m
Description:
The danger rating is MODERATE for wind slab avalanche activity above 2000m on the highlighted aspects. It is stubborn to human triggering however sensitive cornice above has been a very effective trigger. For this reason it would be wise to stay well away from slopes with overhanging cornice. The wind slab is high in start zones with failures occurring down 20cm to 40cm, the initial failure has stepped down in some areas to a secondary weakness located about 60cm deep in the slab.

Tertiary Avalanche Danger

Dangerous Aspects
high
Danger Rose
1
Highest Danger Rating
Likelihood
indicator
gauge
Certain
Likely
Unlikely
Size
indicator
gauge
Largest
Small
Trend
indicator
gauge
Increasing
No change
Decreasing
Time of day
clock
Time of day
9am - 5pm
Alpine level
High Alpine: Above 2000m
Alpine: 1000 to 2000m
Low Alpine: Below 1000m
Description:
A LOW danger rating exists for loose wet avalanche activity on solar aspects above 1700m. High solar input will affect the snow surface resulting in a loss of surface cohesion. Slopes that are steep and receive a lot of sun will be most prone to this type of activity. Think of areas like the Pinnacles at Whakapapa or the summit crater rim. These are the types of slopes that are susceptible to this particular avalanche problem. Deep boot penetration through wet unconsolidated snow will be a sure sign things are becoming unstable. The key to a good days touring in these conditions is timing. Simply change to a cooler aspects to manage the hazard. A small avalanche with a high consequence can lead to a poor outcome.

Recent Avalanche Activity

Recent Avalanche Activity
No natural avalanche activity reported or observed over the past 24hrs.

Current Snowpack Conditions

Current Snowpack Conditions
Isolated lingering wind slab above 2000m is still reactive to heavy loads. Degree of reactivity has been proven over the last 48hrs as cornice failure continues test the wind slab. These failures have triggered isolated pockets of wind slab below resulting in a combo of dense wind slab and large cornice debris which would be hazardous to someone caught. This wind slab has a density variation which is graphically illustrated in step down crown walls. Some surface hoar is developing around the 2000m elevation band on shady slopes. Overall the snowpack is becoming consolidated and strong.
The Northern region is moving into a melt freeze cycle with loss of surface cohesion on solar aspects.

Mountain Weather

Mountain Weather
Fine and clear weather continues with light winds. The freezing level is around 1800m into Thursday. Winds Northerly trending North Westerly tomorrow.



MetService
For more information go to: http://www.metservice.com/mountain/index

Sliding Danger

Slide For Life
Carry an ICE AXE and CRAMPONS. Various forms of ice will be encountered on your day in the backcountry. Having the right gear and knowing how to use it will be necessary to manage the hazard.

Forecast by Richard Te Ua

Avalanche Forecast Regions:
Mountain Safety Council managed websites
Mountainf Safety Council websiteAdventure Smart websiteNew Zealand Avalanche Center