Issued: Sat, Nov 18, 2017 at 8AM

Expires: Sun, Nov 19, 2017

We will be providing an AIARE Avalanche Level 1 Class this winter in Haines, February 23-25, 2018

More info and signup here.

Above 2,500ft Considerable

1,500 to 2,500ft None

Below 1,500ft None

Degrees of Avalanche Danger ?

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

Avalanche Danger Rose ?

Avalanche Problems ?

Problem Details

Above treeline: human-triggered avalanches are possible-likely. There will be pockets of CONSIDERABLE danger on high, wind loaded aspects.

Our current alpine snowpack is characterized thus: 3mm depth hoar at the ground, with a pencil-hard rain crust above, and varying cold wind-packed layers above that. The upper slab has been tender and reactive, sliding on planar crystals above the ice crust.

The takeaway: our snowpack is thin, highly variable from place to place, and generally weak with very poor structure. 

Snowpit from Nov. 11th near the Chilkat Pass. Click for larger version.

A few notes:

  • Avalanche season is here. We’ve already had a significant skier-triggered avalanche reported (see below).
  • We have an extreme lack of snow so far this season. Total precipitation since October 1st is at 38% of normal. Snow depths are around 10cm at 3,500ft, ranging up to 100cm in wind loaded areas above 5,000ft.  Variability is high due to persistent dry, windy conditions.
  • Temperatures above treeline are around 0 – 5°F. This has caused faceting of the thin snowpack. These 3mm facets are setting up a weak base to hold up future heavy snows. Keep this in mind as November progresses and snow depths increase. This will likely turn into a deep-persistent slab problem.

Start the season with fresh batteries in your beacon, and practice with your beacon, shovel, and probe.

If you get out on the snow, send in your observations! We will start regular forecasting when enough obs start coming in.

Recent Avalanche Activity

SS-AR-D2-R3-S | A snowboarder-triggered D2, Nadahini-area, 10-28-2017

October 28th: First rider-triggered slide reported from the peak north of Nadahini (“Sunny Bunny”). D2 soft slab ran in storm snow from Oct 26-27. Nobody caught or injured. [ SS-AR-D2-R3-S ] South aspect @ 6,200ft.

Small – Moderate natural avalanche activity is occurring during/after storms. So far it has been mostly loose-snow slides, with a few slab avalanches as well.

Recent Weather

Alpine temperatures have been (5 – 15°F) for the last 2 weeks. North winds have been moderate-strong with occasional blowing snow. Some clearing is possible for this weekend.

 Snow Depth [in] Last 24-hr Snow/SWE [in] Last 3-days Snow/SWE [in]  Today’s Freezing Level [ft]  Today’s Winds Next 24-hr Snow/SWE
Mount Ripinsky @ treeline


9″ / 0.50 9″ / 0.50 0  strong, N  0″ / 0.00 *
Flower Mountain @ treeline


 3″ / 0.15  3″ / 0.15 0 strong, NW  0″ / 0.00 *
Chilkat Pass @ 3,500ft
 5″ 2″ / 0.10 2″ / 0.10 0 strong, NW  0″ / 0.00 *

( *star means meteorological estimate )



Additional Info & Media

Posted in Transitional Zone Forecasts.
Erik Stevens

Forecaster: Erik Stevens