New Zealand Mountan Safety Council

Canterbury

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Issued at 23/07/2017 2:43am. Valid till 24/07/2017 6pm

Mt Hutt

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
4
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 HIGH rating continues through Sunday for persistent slab avalanches. Weather from the past few days has added increased weight to the weak layers and this hazard cannot be reduced until further information is gathered over the coming days. These avalanches are amazingly hazardous and tricky to trigger in one place and very touchy in another. Travel in the backcountry is not advised. Please avoid terrain which could leave you or your travel team exposed.

Secondary Avalanche Danger

Dangerous Aspects
high
Danger Rose
3
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 CONSIDERABLE danger exists for wind slab avalanches today. Very strong winds from the south and southwest have made large wind loads in areas lee to this wind direction. The wind affected snow is well bonded to the old snow surface but can exist as a serious burial threat if triggered, as some of the wind drifts are very large. Take note of areas that may face toward the wind, but can collect snow from spinning snow directions and collect in protected places (around rock features, for example).

Tertiary 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
1pm - 4pm
Alpine level
High Alpine: Above 2000m
Alpine: 1000 to 2000m
Low Alpine: Below 1000m
Description:
Warm temperatures and mild wind speeds will allow the energy of the sun to warm the surface of the snow in areas prone to the most sunlight during the day. This should be a small problem as it acts alone, but will bear significance for the primary and secondary avalanche dangers for Sunday, as the wet loose could stress other avalanche problems with too much extra snow weight.

Recent Avalanche Activity

Recent Avalanche Activity
While there has been little opportunity to see activity in the range, it can be all but guaranteed that natural avalanche activity has taken place. Late Saturday evening, a size 2 avalanche was triggered by explosives at Mt. Hutt in a slope near ridgeline facing towards the Northeast. With a sunny and clear Monday, please be sure to share all finding with the site, as any information will help us gather more clues to the activity that may have taken place during the storm cycle and after.

Current Snowpack Conditions

Current Snowpack Conditions
The snow from before the snow remains as a primary concern. Buried layers of weak snow with frozen layers (crusts) in between have created a very poor structure, and should be a concern because this represents the bottom, the foundation, for any snow which may lie on top. The storm cycle deposited roughly 1 meter of snow with intense winds, leaving some areas bare, and other areas with very large piles of wind affected snow.

Mountain Weather

Mountain Weather
The storm has ended. Sunday will have clear skies, calm winds eventually switching to a Northwestrely direction. Temperatures will be warm, right around the freezing point.


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

Sliding Danger

Slide For Life
Icy areas exist where the high winds have stripped the snow down to older icy layers.

Forecast by Luke Ochs

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