New Zealand Mountan Safety Council

Mackenzie

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Issued at 23/07/2017 5:39pm. Valid till 24/07/2017 6pm

Two Thumbs

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:
Associated with the storm slab, there will be a fair amount of snow being transported by the SE winds and forming windslabs below ridgecrests and mid slope on North to NW aspects above 1400m. Conservative planning and route selection is imperative at the tail end of a storm such as this. Take the time to investigate the bonding of the new and the old snow layers and choose the "safe line" over any desire to go loose when it clears.

Secondary 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:
In early July there was a fine and windless period that favoured the development of fragile frost crystals on the surface of the snow, "surface hoar". This was buried on the 11th of July by a decent snowfall but constitutes a weak layer 20-80cm deep within in the snow that with subsequent loading can easily overload and cause slab avalanches that could have serious consequences. The dynamics of this part of the snow pack are not likely to change, but it could become a reactive layer as extra loading is applied in times like this.

Recent Avalanche Activity

Recent Avalanche Activity
There were reports of large (sz 2+) avalanches occurring naturally on Solar NW aspects north of Round hill into the Coal stream area last week. There have also been occurrences of skier accidental triggered smaller slides on NE aspects (one happened while digging a pit to ascertain stability)at around the 2000m elevation.
No recent reports in yet, but one would have to assume an active avalanche cycle has been through the area early in the weekend.

Current Snowpack Conditions

Current Snowpack Conditions
The previous storm in early July brought 40-60cm of snow to the region and reports from Round Hill have up to 110cm of new snow as of Saturday PM
On many sheltered shady slopes, this new snow will lie over a weak old snow surface and may be slow to bond which would appear to be the case with recent stability test and observations of activity

Mountain Weather

Mountain Weather
Fine weather Sunday.
NW winds picking up overnight and the next frontal band is likely to pass over the forecast area on 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