Glacier National Park Avalanche Forecast

Issued: Apr 21st, 2022 4:00PM

Thu Apr 21st Current Conditions
Alpine Moderate Treeline Moderate Below Treeline Moderate
Fri Apr 22nd 2 Day Outlook
Alpine Moderate Treeline Moderate Below Treeline Low
Sat Apr 23rd 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 moderate. Known problems include Wind Slabs, Loose Wet and Cornices.

A spring storm could bring up to 15 cm of new snow, with rain below treeline tonight and tomorrow.  Hazard is moderate if the forecast amounts come true.

Summary

Weather Forecast

Spring flurries tonight and Friday, possible mod to heavy rain/snow, FZ Lvls remain elevated through Sunday

Tonight: Flurries, up to 15 mm possible, FZL 1500m, light ridge winds

Fri: Cloudy with sunny periods and isolated flurries, Alp high -2*C, FZL 2000m, light W winds

Sat: Cloudy with sunny periods, Alp high -2*C, FZL 2000m, light W winds

Snowpack Summary

Uncertain amount of snow/rain forecast for Thurs night / Fri, will refresh surfaces at treeline and alpine. This will cover 20 cm of storm snow that fell on Tuesday, with strong SW winds. The April 18th interface, down 5-30 cm which is a crust on all aspects up to 2200 m and into the alpine on solar aspects. The below treeline crust is supportive.

Avalanche Summary

No new natural avalanches have been observed recently. No reports of human triggering of recent storm snow in the park.

Neighbours are reporting reactive storm snow on top of an April 18th Crust.

Confidence

Intensity of incoming weather systems is uncertain on Friday

Problems

Wind Slabs

An icon showing Wind Slabs

Likelihood

Possible

Expected Size

1 - 2.5

Lingering wind slabs can be found on lee features. New snow might increase the likelihood of triggering on Friday. These slabs are up to 30 cm deep and sitting on top of a crust on all but northerly alpine aspects.

  • Recent snow may be more sensitive to human triggering on a crust
  • Use caution in lee areas in the alpine and treeline.

Aspects:

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

Elevations:

Alpine, Treeline.

Loose Wet

An icon showing Loose Wet

Likelihood

Possible

Expected Size

1 - 2

Rainfall and warm temperatures will increase the hazard below treeline on Friday. Watch for loose, wet snow as a sign of instability.

  • Avoid terrain traps, such as gullies, where the consequences of a small avalanche could be serious.
  • Use extra caution on slopes if the snow is moist or wet.

Aspects:

All aspects.

Elevations:

Below Treeline.

Cornices

An icon showing Cornices

Likelihood

Possible - Unlikely

Expected Size

1.5 - 3

Cornices are LARGE and may be sensitive to temperature fluctuations, solar radiation, wind loading or just your mere presence nearby. Take necessary precautions if approaching them to access your line and limit your exposure below them.

  • Minimize exposure to cornices. They will squish you.
  • Give cornices a wide berth when traveling on ridges.

Aspects:

All aspects.

Elevations:

Alpine.

Valid until: Apr 22nd, 2022 4:00PM

Forecast Trend

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