Avalanche Forecast

We continue to receive reports of large storm slab and wind slab avalanches, size 2-3, that likely occurred within the storm earlier this week in both Haines Pass and White Pass.

No new avalanches were reported yesterday though wind slabs remain possible to human trigger.

If you head out in the backcountry, let us know what you are seeing by submitting a report to the Mountain Information Network.

Around 50 cm of storm snow has fallen around White Pass, with lesser amounts as you move east. Southerly winds have built deeper deposits on north facing terrain features near ridges.

In Haines Pass upwards of 50 cm of storm snow fell, with rain on snow occurring below 700 m. Storm totals also taper inland here, with winds rapidly redistributing snow and leaving soft snow to be found in sheltered gullies and side valleys.

In all areas, storm snow is settling with warm temperatures. This overlies previously wind affected snow (sastrugi) in exposed areas and faceted snow in sheltered features.

A buried weak layer of surface hoar can be found about 80 cm deep in Powder Valley, Tutshi, and Paddy Peak areas, 150 to 200 cm around White Pass and 80-200 cm deep in Haines Pass. This layer is most prominent on northerly slopes sheltered from the wind. On other aspects, this layer is a hard melt-freeze crust with weak facets around it. To date this layer is has been most problematic in alpine terrain.

The remainder of the middle of the snowpack is consolidated and strong. Weak faceted grains are found near the base of the snowpack, particularly in thin snowpack areas.

Sunday Night

Cloudy with scattered flurries, 6 cm expected for Haines and 2 cm for White Pass. Moderate southeast winds. Alpine temperature low -4°C. Freezing levels reach 800 m.

Monday

Cloudy with isolated flurries, 1-3 cm accumulations. Moderate south winds. Alpine temperature high -3°C. Freezing levels 1000 m.

Tuesday

Cloudy with clear periods. Strong southwest winds. Alpine temperature high -7°C. Freezing levels 500 m.

Wednesday

Mainly cloudy with isolated flurries, 1-3 cm accumulations. Strong southwest winds. Alpine temperature high -5°C. Freezing levels 700 m.

More details can be found in the Mountain Weather Forecast.

• Stay off recently wind loaded slopes until they have had a chance to stabilize.
• Be carefull around freshly wind loaded features.
• Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
• Conditions may have improved, but be mindful that deep instabilities are still present.