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Issued at 31/07/2014 2:44pm. Valid till 1/08/2014 6pm

Ohau

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:
With conditions ripe for avalanching already and continuing bad weather in the forecast you can expect to encounter areas of reactive windslab on slopes lee to the N/NW. Swirling winds will mean that other aspects, and areas well down slope from ridge top may harbor reactive slab as well. Poor visibility at times and strong winds will make identification of these areas difficult so it's probably a good idea to let this spell of weather pass through before venturing into the backcountry. The hazard described will be amplified in the northern part of the region where more snow has fallen. A rise in temperature Thursday may well see another weakness develop with denser snow falling over todays lighter snow.

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:
As pulses of precipitation come in expect the danger level to rise accordingly, especially about lee slopes and features above about 1900m

Tertiary 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:
If the forecast rise in freezing level up to 2200m does eventuate then you could expect to see Thursdays rain fall on Wednesdays snow that will likely result in a round of loose wet slides around the 1600-1900m elevation band.

Recent Avalanche Activity

Recent Avalanche Activity
None reported as of Wednesday afternoon but plenty expected, especially close to the Divide where precipitation is focused.

Current Snowpack Conditions

Current Snowpack Conditions
As of late Wednesday afternoon about 15 cm of heavy snow has accumulated on the upper ski hill at Ohau with about 5cm at base level. Nearer the Divide closer to 50cm or more is likely to have fallen tapering with elevation and distance from the Divide. This new snow has fallen with gale NW winds (surprise, surprise) depositing areas of stiff slab on many aspects, not limited to those directly lee. In many areas this will be landing on weak facetted snow that formed with the recent cold, clear weather. In turn this weak snow sits atop a hard rain crust that will provide a most excellent bed surface for avalanching. Exposed aspects will be severly punished by this wind, with loose gravel being blown about, along with the snow.

Mountain Weather

Mountain Weather
Windy with snow and rain showers heavier near the divide


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

Forecast by Ben Taylor

Mountain Safety Council
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