New Zealand Mountan Safety Council

Southern Lakes

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Issued at 23/07/2017 11:22am. Valid till 24/07/2017 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
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:
Storm activity from the Northerly 1/4 pounded the region on Thursday. On Friday, storms from the Southerly 1/4 delivered a further lashing. Reactive wind slab is likely to be found on a range of aspects but especially on slopes in a North facing arc from East through to West above 1650m. This wind driven snow is sitting on a pack which contains numerous suspect layers including, buried surface hoar, facet layers and depth hoar at ground. Dangerous avalanches could trigger under the weight of a single skier or rider. Avoid ridge line entry points, convex rolls and other steep terrain if you discover deposits of stiff wind slab.

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 substantial amount of snow has fallen over the past few days and this will stress weak layers buried in the snow pack. Rain/rime crusts buried at least 60cm below the surface have layers of facets (weak, sugary forms) growing above and below them. Failures involving these weaknesses in the mid and lower pack are likely as the load on them increases.

Recent Avalanche Activity

Recent Avalanche Activity
Control work at a local ski field on Saturday produced several Size 2 hard slab results on North facing slopes. Since last weekend, storms have dumped a substantial load onto a snow pack which is riddled with weaknesses. A cycle of natural avalanches occurred earlier in the week with paths running on a multitude of aspects.These slides will have cleaned out some of the weak layers. If the slope does not show evidence of having run recently, weaknesses may well still be present. Settlements and cracking continue to occur.

Current Snowpack Conditions

Current Snowpack Conditions
A significant quantity (50cm plus) of new snow fell along the Divide a few days ago and more has fallen over the past 48 hours. This recent snow has landed on a pack which is weak in many places with areas of buried surface hoar, facet layers and some depth hoar evident at ground. Rain/rime crusts which formed several weeks ago are now buried down at least 60 cm. Temperatures have fluctuated wildly over the past few days. The only certainty at the moment is that snow pack conditions are highly variable and unpredictable - be prepared for the unexpected.

Mountain Weather

Mountain Weather
Conditions have been very volatile all week with ongoing storm activity, wild changes in temperature, and frequent wind shifts.This tempestuous weather continued on Friday with snow to low levels and severe gales from the SE/South.The weather is forecast to improve on Sunday but unless you possess advanced back country skills, out of bounds skiing and riding is not advised.


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