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Issued at 21/09/2014 7:32pm. Valid till 24/09/2014 6pm

Nelson Lakes

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:
Further snow fall associated with strong southerly winds, in combination with the recent snow fall that is available for transport ,will see wind slab form on steep slopes lee to the southerly half.

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:
Strong to gale force westerly winds and storm snow totals of 70cm have created wind slab lee to the westerly quarter. Associated cornice development is also likely. Caution will be required on aspects lee to the west ,where the slopes are steep and unsupported, particularly at upper elevations of the park. This danger will be most widespread in the south and western areas of the national park where more substantial snow cover exists. It is expected that this danger will decrease significantly by sunday afternoon.

Recent Avalanche Activity

Recent Avalanche Activity
No new avalanches observered.

Current Snowpack Conditions

Current Snowpack Conditions
August snow storms saw snow fall in the park that was associated with winds from the northwest and southwest. Most loading occurred lee to the westerly quarter. As a consequence the snowpack is very shallow on north and western aspects. It is expected that the snow pack has completed its transition into a spring snow pack on all aspects and elevations with substantial loss of snow during the last weekend. Further snow of up to 40 cm during Monday night and Tuesday has seen this covered with new snow, most being delivered to eastern aspects due to gale force westerly winds. Further snow falls of up to 50cm fell durning Friday and early Saturday morning in light to moderatet winds from the westerly half. Existing snowpack that survived the rain event from last weekend has not had a chance to refeeze below 1800 metres.

Mountain Weather

Mountain Weather
Showers , falling as snow above 700 metres.Clearing early morning and becoming fine. Southerly gales about the tops.



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

Forecast by Adrian Briggs

Mountain Safety Council
Avalanche Forecast Regions:
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