New Zealand Mountan Safety Council

Tongariro

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Issued at 23/07/2017 3:33pm. Valid till 24/07/2017 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
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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:
The danger rating is MODERATE above 2300m and LOW below to 1800m for Wind Slab avalanche activity on aspects North through South as highlighted on the aspect rose. Significant deposits of wind slab can be found on the hazardous aspects, these slabs have had time to heal and are becoming very stubborn to triggering. Pay special care on steep unsupported terrain, these areas are the areas most likely to fail.

Secondary 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
10am - 3pm
Alpine level
High Alpine: Above 2000m
Alpine: 1000 to 2000m
Low Alpine: Below 1000m
Description:
The danger rating is LOW for loose wet avalanche activity on solar aspects between 1600m to 2200m. The northern region of the park has experienced some heating which has increased the chance of loose wet avalanche activity. Moderate winds and some cloud will limit the hazard however it is still worth considering when moving into the backcountry.

Recent Avalanche Activity

Recent Avalanche Activity
A size 2 wind slab avalanche was triggered just above the Turoa ski field with explosives on a southeast aspect at 2400m, this occurred within the new loading on a steep isolated slope.

Current Snowpack Conditions

Current Snowpack Conditions
Wind slab deposits still exist on the easterly half above 1800m, in many areas this is capped by a brittle rime crust all the way to the summit slopes, the slab is healing rapidly however still reactive to very large loads on steep unsupported start zones above 2000m. Solar aspects are seeing a fair bit of warming, this is isolated to the Northern slopes of Ruapehu, the concern is small and solar input has been limited.

Mountain Weather

Mountain Weather
Conditions should clear briefly Sunday afternoon, especially in the northern part of the forecast region with light to moderate southerly winds and occasional snow flurries above 1500m. Monday is forecast to start with scattered cloud increasing towards the afternoon, winds will turn northwest and strengthen during the day, snow flurries above 1300m to start rising to 1500m by evening.


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

Sliding Danger

Slide For Life
Wind stripped slopes and ridge tops have been thoroughly buffed and are now very slick, slide for life conditions will exist on many of these area. Carry necessary safety gear: ICE AXE and CRAMPONS.

Forecast by Dave Wright

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