Archived

Avalanche Forecast

Mar 23rd, 2018–Mar 24th, 2018

Alpine

3: Considerable

The avalanche danger rating in the alpine will be considerable

Treeline

2: Moderate

The avalanche danger rating at treeline will be moderate

Below Treeline

1: Low

The avalanche danger rating below treeline will be low

Alpine

2: Moderate

The avalanche danger rating in the alpine will be moderate

Treeline

2: Moderate

The avalanche danger rating at treeline will be moderate

Below Treeline

1: Low

The avalanche danger rating below treeline will be low

Alpine

2: Moderate

The avalanche danger rating in the alpine will be moderate

Treeline

2: Moderate

The avalanche danger rating at treeline will be moderate

Below Treeline

1: Low

The avalanche danger rating below treeline will be low

Regions: South Rockies.

Strong winds are driving the alpine danger to CONSIDERABLE. Watch for whumphing and cracking below your feet and continue to make observations while gaining elevation towards alpine terrain.

Confidence

Moderate - Wind effect is extremely variable

Weather Forecast

Saturday: Mainly cloudy. New snow 5-15 cm accompanied by strong southwest ridgetop winds. Alpine temperatures near -4 and freezing levels 1700 m.Sunday: Mix of sun and clouds with isolated flurries. Ridgetop wind strong from the West and freezing levels near 1400 m.Monday: Cloudy with some sunny periods and isolated flurries. Ridgetop wind strong from the southwest. Alpine temperatures near -8 and freezing levels 1300 m.

Avalanche Summary

Natural loose dry avalanches were reported on Friday from steeper slopes and terrain features.

Snowpack Summary

Up to 15 cm of new snow, accompanied by strong easterly winds in the beginning of the storm and now switching to the southwest are forming wind slabs on a variety of aspects. Forecast snow for Saturday will add to these totals and may initially have a poor bond to the underlying old snow surfaces which consist of crusts up to 2100 m and dry snow or surface hoar on north aspects above 2100 m. Snowpack testing on the March 15th surface hoar interface (down 20-40 cm on sheltered North aspects) has shown no significant results in the Barnes area. The mid-pack is is well consolidated. Deeper in the snowpack (50-80 cm down) a surface hoar buried mid-February may exist. This interface is dormant. Digging towards the bottom of the snowpack you'll find a combination of crusts and facets that are reportedly widespread.

Avalanche Problems

Wind Slabs

Changing winds from East to West continue to be strong, redistributing the new storm snow onto most aspects. Wind slabs will likely be reactive to skier/rider triggers. Loose dry avalanches may occur from steeper terrain features.

Avoid large slopes with thin-thick snow coverage and convex features.Use caution in lee areas in the alpine and tree line.Watch for signs of instability such as whumpfing, or cracking.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2