Issued: Mon, Mar 27, 2017 at 10AM

Expires: Wed, Mar 29, 2017

Above 2,500ft Considerable

1,500 to 2,500ft Considerable

Below 1,500ft Moderate

Degrees of Avalanche Danger ?

1. Low
2. Moderate
3. Considerable
4. High
5. Extreme

Avalanche Danger Rose ?

Avalanche Problems ?

Problem Details

Problem #1: Storm Snow

Distribution: All aspects above 1000ft. 6-12″ of new snow Monday combined with moderate and variable winds will be creating fresh storm slabs to watch out for. Wind-protected areas will be your best bet, just watch out for anywhere the new snow becomes cohesive and slabby.

Problem #2: Persistent Slab

Distribution: All aspects above 1500ft. If you dig down 60-90cm deep, we have layered hard slab with lots of weak, facetted snow underneath. There’s also an old rain crust below that with facets above and below (see profile below). Last week, we saw lots of natural and human-triggered slides on these layers. These weak layers have started to slowly strengthen, but they remain an area of concern and triggering is still quite possible. You still need to be thinking about deeper layers and digging to assess them. Although the likelihood of triggering these layers is decreasing, slides this deep are very dangerous and high consequence.

Recent Avalanche Activity

We’ve had recent avalanches reported several days over the last week. Most slides have been D3, running about a meter deep on the troublesome facet layer we’ve been warning about. This includes some slides that have been remotely triggered from ridgelines, and some skier-triggered slides and close calls.

Recent Weather

Onshore flow this week will bring a series of weak/moderate storms, with winds turning southerly and a warming trend. Snow levels will rise to 1000-1500ft Monday afternoon. 6-12″ of new snow is likely above that level by Tuesday morning. Another wave of steady precipitation hits Wednesday.

March 19th-23rd brought 8-16″ of snow.

24-36″ of snow fell march 12th-17th.

Additional Info & Media

We’ve been getting widespread reports of sketchy conditions for the last several days. This includes lots of whumphing, shooting cracks, and fresh avalanche activity. Be conservative, and avoid avalanche terrain when possible.

Posted in Transitional Zone Forecasts.
Erik Stevens

Forecaster: Erik Stevens