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Issued at 23/07/2014 3:25pm. Valid till 24/07/2014 6pm

Tongariro

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:
More snowfall and strong South East to South West winds have continued to build windslabs on lee slopes. There is currently a lot of variability across the region. In South Western areas very large loads have only triggered very small avalanches, whereas in North Western areas there has been a recent natural avalanche cycle. In saying that, the weather condtions have made it impossible to have a really good look around and see what has happened up high in the mountains. Human triggering will be likely over Thursday, so careful route finding and conservative decision making will be essential if you are heading out. Avoid all areas of fresh windslab, and remember that although the main wind direction has been from the Southerly 1/4, local terrain features can funnel it around, loading a variety of different aspects.

Recent Avalanche Activity

Recent Avalanche Activity
Over Tuesday morning a small natural avalanche cycle occurred on the North Western parts of Mt Ruapehu. These were mostly size 1 windslab avalanches on North - North East facing slopes above 1800m. Explosive avalanche control work at Whakapapa and Turoa produced slabs up to size 1.5 on slopes that face the Northerly 1/2 above 1800m. No recent observations from Tongariro / Ngaruahoe due to poor weather conditions.

Current Snowpack Conditions

Current Snowpack Conditions
Windslabs have continued to form on slopes facing the Northerly 1/2 above 1600m. These are currently reactive above 1800m, and are averaging around 40cm thick at 2000m. There is a softer layer of snow near the base of the slab, which has been the weakness responsible for the above mentioned avalanches. Windward slopes have been scoured back to a slick ice layer.

Mountain Weather

Mountain Weather
Snowfall looks likely to stop late Wednesday evening, bringing a mostly fine day for Thursday with easing South Westerly winds.


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

Sliding Danger

Slide For Life
It will be icy on windward slopes and ridgelines.

Forecast by Ryan Leong

Mountain Safety Council
Avalanche Forecast Regions:
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