New Zealand Mountan Safety Council

Southern Lakes

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Issued at 27/07/2016 7:40pm. Valid till 28/07/2016 6pm

Wanaka

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:
Over the next 24 hours, at least 1/2 a meter of new snow is due to fall along the Divide with less in the East. As this snow accumulates, it is likely that storm slab will begin to form on a range of aspects especially above about 1400m. Stay clear of steep terrain if you suspect that slab is developing and avoid slopes exposed to terrain traps. Storm conditions and periods of poor visibility are likely to make identifying avalanche prone slopes difficult.

Secondary 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:
Heavy snow continues to fall across the region. With plenty of snow available for transport and persistent gale force winds from the Westerly 1/2 it is very likely that deposits of wind slab have formed on lee aspects especially, above about 1600m. In many places, these slabs may trigger under the weight of a single skier or rider. Avoid ridge line entry points, convex rolls and other steep terrain if you discover areas of stiff, wind driven snow. Unless you possess advanced snow safety skills stay out of the back country until conditions settle down.

Recent Avalanche Activity

Recent Avalanche Activity
A heli ski operation has reported a natural 1.5 size slide on a steep (40 deg.) SE aspect at around 1850m. Control work at a local ski field over the past week has produced multiple size 1 and 1.5 results lee to the Westerly half. These slides consisted of wind slab running on hard crusts. With another N/NW storm arriving on Wednesday evening, we are very likely to see more avalanche activity over the next few days.

Current Snowpack Conditions

Current Snowpack Conditions
A significant quantity of new snow has fallen over recent days. This snow is being redistributed almost immediately by gale force winds from the Westerly 1/2. As a consequence, the pack remains highly variable in depth. Widespread areas remain very shallow while in other areas, much deeper deposits of snow have formed. In many places, the surface prior to the most recent storm consisted of hard crusts. Mid pack, potential weak layers have been identified including graupel and facets (loose,sugary snow). The facet layers are most likely to be present on steep,shady slopes (S through E) above 2000m. The lower pack appears relatively strong at the moment, with a laminate of stout crusts holding it together.

Mountain Weather

Mountain Weather
The weather deteriorated rapidly on Wednesday afternoon with snowfall and rising NW winds. Over the next 24 hours, we are going to experience further heavy snow to low levels and NW winds of 65 kph increasing to 85 kph before they begin to shift more to the SW. Conditions are currently changing very rapidly and this is a situation which looks likely to continue for several days.


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

Forecast by Simon Howells

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