Issued: Mar 29th, 2023 4:00PM
The alpine rating is, the treeline rating is , and the below treeline rating is
Watch for unstable snow on isolated terrain features. Although triggering slabs on deeply buried weak layers is unlikely under the current conditions, we'll be avoiding rocky start zones and thick to thin transitions for the remainder of the season.
White Pass: Over the weekend, small (size 1) rider-triggered wind slabs were reported in the alpine. A natural loose wet avalanche cycle up to size 2 occurred on steep south aspects around treeline on Friday.
Haines Pass: On Monday, a couple of large, deep avalanches were observed in the alpine. A size 3 on a northeast aspect was thought to have run during a wind event on Sunday, and a size 2.5 on a south aspect was thought to have been triggered by strong sun. These have been isolated occurrences so far but may be a sign of things to come as the spring warms up.
If you head out in the backcountry, let us know what you are seeing by submitting a report to the Mountain Information Network.
Generally, surfaces are wind-pressed in the alpine and crusty on solar aspects especially around treeline. Soft snow may be found in shady, wind-sheltered areas. At Haines Pass, 5-10 cm of snow sits over a rain crust below 1300 m.
Weaknesses in the mid and lower snowpack are unlikely to produce avalanches under the current conditions. A weak layer of surface hoar/crust/facets buried in early January is now over 1 m deep in most areas, and has not produced avalanche activity for several weeks. The lower snowpack consists of basal facets, particularly in thin snowpack areas.
Increasing cloud. Light to moderate southwest wind. Alpine low -8 °C.
Cloudy with flurries bringing a trace of snow. Moderate southwest wind. Alpine high -6 °C.
3-8 cm of new snow. Moderate southwest wind. Alpine high -5 °C.
A trace of new snow. Light southeast wind. Alpine high -5 °C.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
- Small avalanches can have serious consequences in extreme terrain. Carefully evaluate your line for wind slab hazard before you commit to it.
- Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
Valid until: Mar 30th, 2023 4:00PM