Glacier National Park Avalanche Forecast

Issued: Apr 4th, 2021 8:57AM

Sat Apr 3rd Current Conditions
Alpine Considerable Treeline Moderate Below Treeline Low
Sun Apr 4th 2 Day Outlook
Alpine Moderate Treeline Moderate Below Treeline Low
Mon Apr 5th 3 Day Outlook
Alpine Moderate Treeline Moderate Below Treeline Moderate

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

New snow and wind changed conditions overnight on Saturday. Carefully evaluate how the wind has loaded features before committing to them

Summary

Weather Forecast

A cold front is exiting this morning

Sun: 2cm snow, sky becoming scattered, high -2, freezing level 1800m, light W wind

Mon: Nil precipitation, high -1, freezing level 1800m, light SW wind

Tue: Trace precipitation, high 0, freezing level 1900m, light S wind

Snowpack Summary

15cm of new snow fell at treeline overnight, dwindling to rain below 1200m. Wind blasted surfaces exist below the new snow, suncrusts and meltfreeze conditions below treeline. Recent snow over the March 18th suncrust and surface hoar has settled significantly to about 70cm at treeline. Cornices are huge.

Avalanche Summary

A group triggered a size 2 in a shallow, wind loaded area on Saturday. The infrasound network detected an avalanche this morning from a N aspect. A group of skiers accidentally triggered a size 3 in the Teddy Bear Trees on Tuesday, this slab avalanche failed on the March 18th melt-freeze crust.

Confidence

Timing or intensity of solar radiation is uncertain on Sunday

Problems

Wind Slabs

An icon showing Wind Slabs

Likelihood

Likely

Expected Size

1 - 2.5

15cm of new snow with strong S wind has created new wind slabs. Pockets of old wind slab in lee and crossloaded features may still be reactive to human triggering. Use extra caution in shallow and or crossloaded features

  • Use caution in lee and cross-loaded terrain near ridge crests.

Aspects:

North, North East, East, North West.

Elevations:

Alpine, Treeline.

Loose Wet

An icon showing Loose Wet

Likelihood

Possible - Unlikely

Expected Size

1 - 2

Rain soaked snow below 1200m, warm snow at treeline and new snow over a crust on solar aspects may be susceptible to solar and human triggering if sunny spells occur this afternoon

  • Use extra caution on solar slopes or if the snow is moist or wet.
  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Aspects:

South, South West, West.

Elevations:

All elevations.

Valid until: Apr 5th, 2021 8:00AM

Forecast Trend

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