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Issued at 2/08/2015 5:45pm. Valid till 4/08/2015 6pm

Arthur's Pass

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
4
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 wind slab hazard is HIGH above 2000M and MODERATE above 1000M. Gale force winds up high will continue to form lee NW slabs at rapid rates. Avoid all avalanche terrain above 2000M and be very careful of what terrain is above you as avalanches will run well below the freezing level - if you don't know - don't go!

Secondary Avalanche Danger

Dangerous Aspects
high
Danger Rose
4
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 loose wet hazard is HIGH anywhere there is old snow that is below the anticipated freezing level of 2300M. The heavy rain will saturate and lubricate the snowpack and all avalanche terrain should be avoided until the the precipitation rate decreases Tuesday AM at the earliest. Watch out for run-out zones and avalanche terrain above you even if you are not traveling in/on snow.

Tertiary 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:
Cornices have been building rapidly since Saturday evening above 1500M and are present on multiple aspects (but predominantly lee to the NW). Be careful traveling on or beneath cornices and remember that cornice falls can trigger avalanches on slopes below. Watch for cornices that are getting rained on which adds new load and weakens cornice's structure.

Recent Avalanche Activity

Recent Avalanche Activity
We saw numerous wet slides on Thursday and Friday (both natural and skier triggered) but have had limited visibility...please share any observations if you get out!

Current Snowpack Conditions

Current Snowpack Conditions
There is a lot variability mostly depending on elevation in the snowpack. Freezing levels have been changing drastically between 1000-2000M and are expected to rise to 2300M. This means that much of the park's snow has been rained on or will be rained on HARD by end of day Monday. Above the 2000-2300M there is a lot of new NW wind affected snow. Below 2000-2300M rain crusts have been forming and melting, and melting and forming since Friday. Most of the current snowpack is undergoing a lot of change right now....if you choose to go out use all of your assessment skills. 100-200mm of moisture is expected by Tuesday morning and we will have nearly zero field observations between Sunday night and Tuesday AM.

Mountain Weather

Mountain Weather
At 6pm on Sunday the freezing level is 1800M and rising to about 2300 Monday. We expect up to 200mm of moisture is coming in by early Tuesday with gale NW winds up high. Tuesday's freezing levels should drop to 1500M in the early PM and 1000M overnight as the moisture volume tapers significantly.


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

Forecast by Peter Biskind

Mountain Safety Council
Avalanche Forecast Regions:
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