Issued: Tue, Nov 29, 2016 at 8AM

Expires: Wed, Nov 30, 2016

A strong strong storm will hit the area Tuesday. Avoid all avalanche terrain and lower runouts.

Above 2,500ft High

1,500 to 2,500ft High

Below 1,500ft High

Degrees of Avalanche Danger ?

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

Avalanche Danger Rose ?

Avalanche Problems ?

Problem Details

Fresh storm slabs will be building during the storm, 30-90cm thick. The new snow will be upside-down (weak at the bottom and heavy/wet at the top) which makes it prone to avalanche, especially during periods of rapid loading or rapid warming. We expect both of these things to happen throughout the storm, with strong north winds, then strong south winds, very heavy snowfall, and finally a strong warm up at the end of the storm.

Below 1500ft the danger will transition to wet slides after the southerly push Tuesday evening. Rain on snow will cause natural avalanches in steep terrain that is sparsely treed. This includes meadows, gullies, and avalanche chutes.

Recent Avalanche Activity

Recent Weather

A strong storm will slam into the coast Monday night and jump into the Yukon by Tuesday evening. Winds will turn northwest Monday night, and increase to 20-30mph. Sometime Tuesday evening there will be a dramatic switch to south winds 40-60mph.

This system is loaded with tropical moisture, and cool air will be sucked out of Canada under north winds for most of the storm, leading to a heavy overrunning snow event. Snowfall rates up to 3″  per hour are likely during the heaviest snowfall Tuesday morning. Snow levels will be at sea level until the southerly wind burst raises them to around 1,200 feet Tuesday evening. Total snowfall will be 12-18″ in the valleys and 16-30″ over the mountains. Liquid equivalent will be 2-3″.

Additional Info & Media

Avoid all avalanche terrain during this storm. This includes the runout zones of large paths on the valley floor. Some natural avalanches may reach these lower runout zones.

Posted in Lutak Forecasts.
Erik Stevens

Forecaster: Erik Stevens