Glacier National Park Avalanche Forecast

Issued: Feb 12th, 2021 8:00AM

Thu Feb 11th Current Conditions
Alpine Moderate Treeline Moderate Below Treeline Low
Fri Feb 12th 2 Day Outlook
Alpine Moderate Treeline Moderate Below Treeline Low
Sat Feb 13th 3 Day Outlook
Alpine Moderate Treeline Low Below Treeline Low

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs and Persistent Slabs.

With temps below -20 C, and daily MIN reports of skiers/riders triggering avalanches, it doesn't really seem like the time to tackle big objectives.

Summary

Weather Forecast

Temperatures will gradually warm up through the weekend as the Arctic high begins to break down.

Today: Sunny, Alpine High -17 C, Moderate Northerly winds.

Tonight: Clear, Low -18 C, Moderate E wind.

Saturday: Mix of sun and cloud, High -16 C, light SE wind.

Sunday: Sunny with cloudy periods. Low -16 C, High -15 C. Light S wind.

Snowpack Summary

Renewed Northerly winds have added to previously formed slabs in exposed areas, these are facetting quickly, but remain reactive in lees. Facetting of surface snow is also making sluffs possible in steep terrain. A weak interface of a suncrust with facets and surface hoar, was buried in late January and is now down 60-100cm. Cornices are weakening.

Avalanche Summary

Skiers triggered windslabs on the standard uptrack for Avalanche Crest yesterday.

A group of skiers had a close call Wednesday on the South face of Corbin Peak, triggering a couple of large avalanches on the Jan 24th persistent weak layer.

A skier-triggered sz 2 windslab on Bagheera was reported Tuesday.

Confidence

Due to the number and quality of field observations

Problems

Wind Slabs

An icon showing Wind Slabs

Likelihood

Likely - Possible

Expected Size

1 - 2.5

Alpine winds have been steadily blowing moderate from the North for the past 36hrs; expect windslabs in unusual places.

  • Be careful with reverse loaded pockets of wind slab at ridgeline.

Aspects:

East, South East, South, South West, West.

Elevations:

Alpine, Treeline.

Persistent Slabs

An icon showing Persistent Slabs

Likelihood

Unlikely

Expected Size

1.5 - 3

The January 24th weak interface may be triggerable on solar aspects, where facets and/or surface hoar is sitting on a suncrust.

The bond at this interface may be weakening, with cold temps promoting facetting.

  • Dig down to find and test weak layers before committing to a line.
  • Be wary of slopes that did not previously avalanche

Aspects:

South East, South, South West.

Elevations:

Alpine, Treeline.

Valid until: Feb 13th, 2021 8:00AM

Forecast Trend

The latest forecast danger ratings, broken down to elevation. See how an elevation is trending.