Issued: Mon, Mar 13, 2017 at 8AM

Expires: Tue, Mar 14, 2017

Above 2,500ft Considerable

1,500 to 2,500ft Considerable

Below 1,500ft Low

Degrees of Avalanche Danger ?

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

Avalanche Danger Rose ?

Avalanche Problems ?

Problem Details

Problem #1: Wind Slab

Distribution: On southwest through southeast aspects and cross-loaded terrain features, treeline and up. Wind loading over the last week has created areas of hard slab in the alpine with weak snow underneath. New wind loading on top will only make the problem worse. Slopes below ridgelines, and any other areas of recent wind loading will have cold, dry hard slabs that need to be avoided. Stay well away from cornices and the wind-loaded slopes beneath them. Stick to wind-sheltered areas where the snow is still soft.

 

Recent Avalanche Activity

The last observed avalanche activity was during the last storm cycle Feb 11-15th. There was a natural avalanche cycle within the new storm snow, with widespread D2-D3 slides on all aspects. These were dry slabs above 4000ft, and some nasty wet slabs below that level. A few large avalanches occurred, with crowns up to 2m tall. Some slides hit the valley floors and lower runouts.

Recent Weather

Snow totals are expected to be 8-14″ by Monday evening. Moderate north winds will be continuing with alpine temperatures 5-15F.

Low pressure over the Gulf will be spinning light-moderate snow into our area through the week. A few impulses may bring heavier bursts of snow Tuesday and/or Wednesday, but the timing is hard to pin down right now.

Additional Info & Media

This is an important time to practice good group management skills and risk-reduction. This means keeping your group spread out while traveling in avalanche terrain. Ride one-at-a-time in any areas of risk, and only group up in safe zones well out of harms way. Evaluate each slope carefully, have an escape route, and a plan for what to do if an avalanche occurs. Always make sure every rider has a beacon, shovel, and probe, and knows how to use them.

Posted in Transitional Zone Forecasts.
Erik Stevens

Forecaster: Erik Stevens