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Issued at 8/07/2015 11:45am. Valid till 9/07/2015 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
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:
The large avalanche that ran spontaneously during fine cold weather on the 7th in sawyers stm occurred at about the same elevation and aspect where snow tests in a nearby valley on the 1st july revealed a weak layer of facets on an ice crust buried in the pack. This layer now lies buried up to a meter ( or more in some spots) down and is likely to have been responsible for the Sawyers stm event. Steep high consequence terrain on SE1/4 aspects should be regarded as suspect. especially in the 2300 to 1700 m elevation band.

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:
The recent sequence of winds from NW through W to S along with snowfall over the last 5 days has led to a generalized danger of windslab avalanching. Small human triggered slabs are possible in many places with the potential for larger events on the SE1/4 where deeper weaknesses laid down earlier in the period could still exist. Conditions are generally quite variable from one spot to another and caution is advised.

Recent Avalanche Activity

Recent Avalanche Activity

A size 3 slab avalanche ran sometime during the day (7th) in sawyers stm east aspect 2150 m.
Not much activity seen along the main divide on tuesday apart from one significant event ,size 3, S aspect 2400m on Mt Green than ran on the 6th. Several slab avalanches size 2 observed from the village on E and SE aspects on the Sealy range and hooker valley also ran during the storm on the 6th

Current Snowpack Conditions

Current Snowpack Conditions
Around 40 cms of new snow fell on the 6th with NW winds turning lighter SW during the latter part of the storm. The wind effect was less than previous snowfalls but windslab conditions could persist on lee slopes in many places.

At higher elevations beneath the recent windslab the old pack seems to be reasonably well bonded. Below 2300m multiple crusts buried with weak facetted snow between have been reactive to snow tests lately and could become reactive to human traffic with extra loading. These weaknesses could now lie buried up a meter or more down in the pack depending on a slopes exposure to windloading and proximity to the main divide. (The further east you go the shallower the layer)

Southerly winds today are shifting snow at ridgeline creating windslab potential on N and W aspects.

Fresh loose dry snow will lie over previously wind stripped rocky or icy ground on some exposed upper slopes.

Mountain Weather

Mountain Weather
Cold temps , broken cloud, light winds in the valley with moderate to strong Southerly winds across the tops.


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

Sliding Danger

Slide For Life
A serious sliding hazard exists in places . Steep snowy low elevation terrain or upper slopes exposed to the wind could be slick and hard. In some areas icy slopes will be disguised by loose dry snow. Please don't attempt to cross even short steep icy sections with out the aid of an ice axe and crampons.

Forecast by Trevor Streat

Mountain Safety Council
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