New Zealand Mountan Safety Council

Mackenzie

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Issued at 23/07/2017 5:36pm. Valid till 24/07/2017 6pm

Aoraki/Mt Cook

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:
Two days of NW wind-loading late last week built slab on many S and E facing slopes especially up near the divide. Triggering right now is more likely on slopes just below ridgeline but pockets of slab could exist downwind of terrain features in many places. Then as the storm came through we had a lot of wind early in the piece from the South and SE which will have had a significant loading effect on North and NW slopes giving a broad range of aspects to be wary of. Good decision making and investigation of slopes and snow layers are the tools to see you safely through this period during and post storm. Traveling as a group and having the right equipment and training is also important.

Recent Avalanche Activity

Recent Avalanche Activity
Several sz 2 avalanches occurred during the last storm at higher elevations on Eastern and South to SE aspects in the Gammock ranges and the Burnetts.
Lots of small loose wet activity on solar aspects as well.

Current Snowpack Conditions

Current Snowpack Conditions
The regions snowpack is becoming increasingly variable following the latest series of alternating cold and warm storms. Key features at the moment are; A rain crust below 1900m, this was covered with a thin layer of dry snow Tuesday, but most of that is likely to have blown away by now. Moderate shears observed in the upper 20 cms of the pack Tuesday have also probably settled out thanks to wind and warmth. Deeper in the snowpack, at 50 to 80cms down, a weak faceted old surface layer buried on July 11th remained reactive to snow tests on SE aspects at high elevations on Tues. This layer is gaining strength and it will be interesting to see if extra loading from the coming storm tips the scales to trigger avalanches on it. Windslab development continues on S and E aspects and other sheltered spots. Snow cover, in general, is still comparatively thin but does extend well down to low elevations.
The storm cycle from Friday and Saturday lay down 80-100cm in the East with a tapering effect further West with only 40-50cm there. Some exposed slopes had significant wind sculpting.

Mountain Weather

Mountain Weather
Sunday was fine weather but during the night and into Monday the NW will pick up and precipitation falling as snow initially above 1500m, sometimes heavy will likely be the pattern for the rest of Monday


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

Forecast by Dave McKinley

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