Avalanche Forecast
Avalanche Bulletin - Glacier National Park
Watch for reactive surface layers. Plan your day around being finished before daytime warming increases the avalanche danger.
Avalanche Problem 1: Loose Wet
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Daytime warming will weaken surface layers, plan your day around being back to the trailhead early.
Avalanche Problem 2: Storm Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Over 30cm in last 72hrs initially accompanied by strong to extreme S'ly winds has created storm slabs on all aspects at and above Treeline . Wind effect may have hardened the slab on alpine lee slopes. Today's snow may mask this problem.
Travel and Terrain Advice
- Use caution in lee areas in the alpine and treeline. Storm snow is forming slabs.
Avalanche Summary
Solar input and daytime warming yesterday afternoon initiated a widespread loose wet snow avalanche cycle to size 2.5 up into the alpine on solar aspects and all aspects below treeline. These were mainly loose point release slides with the occasional thin slab release confined to the recent storm snow. Glide cracks are releasing, avoid exposure.
Snowpack Summary
Yesterday's field trip found moist storm snow up to our high point at 2100m. Ski cuts on steep rolls produced sluggish, heavy surface slab with little propagation propensity. Below 1400m the surface layer was rain soaked. The sun rapidly effected surface layers yesterday afternoon. Overnight storm snow will be insulating underlying moist snow.
Weather Forecast
Snow mixed with rain at lower elevations as daytime warming pushes freezing levels up. Alpine temperatures should stay just below freezing and winds in the light range with occasional gusts to moderate. Tonight another pulse of storm should bring an additional 15cm. Snowfall should slow to flurries on Tuesday.
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Loose wet slides can be expected as daytime warming pushes freezing levels upwards of 1800m. Expect surface snow layers to be moist and reactive on convexities and unsupported features treeline and below this afternoon.