Avalanche Forecast

Northwest Inland

Date issued

Mar 19, 2018 - 5:04 PM

Valid until

Mar 20, 2018 - 2:00 PM

Prepared by

mgrist

Low danger does not mean no danger: Normal caution applies and be alert for lingering wind slabs at high elevations. Use caution if wet snow is found at low elevations, especially if the sun comes out for any length of time.

Regular season
Monday - March 19, 2018
Alpine

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Below Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Tuesday - March 20, 2018
Alpine

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Below Treeline

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

Wednesday - March 21, 2018
Alpine

3 - Considerable

Dangerous avalanche conditions. Careful snowpack evaluation,cautious route-finding and conservative decision-making essential.

Natural avalanches possible;human-triggered avalanches likely.

Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas.

Treeline

3 - Considerable

Dangerous avalanche conditions. Careful snowpack evaluation,cautious route-finding and conservative decision-making essential.

Natural avalanches possible;human-triggered avalanches likely.

Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas.

Below Treeline

3 - Considerable

Dangerous avalanche conditions. Careful snowpack evaluation,cautious route-finding and conservative decision-making essential.

Natural avalanches possible;human-triggered avalanches likely.

Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas.

Avalanche Problem 1: Wind Slabs

What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?

Wind slabs may linger in lee and cross-loaded features at higher elevations.

Travel and Terrain Advice
  • Approach lee and cross-loaded slopes with caution.
  • Avoid steep, rocky, and wind affected areas where triggering slabs is more likely.

Avalanche Summary

Over the past several days, wet loose avalanches to size 2.5 were reported at all elevations on sunny aspects. Some of these stepped down to basal facets in northern parts of the region.

In the south of the region, cornice failures on north facing ridge lines in the alpine were also reported, to size 2, but not triggering slabs below.

Snowpack Summary

Variable snow surfaces are found in the region. In the east of the region, 5 to 10 cm of snow fell late last week onto a melt-freeze crust from previous warm temperatures and rain. In the west of the region, the melt-freeze crust is on the surface. Wet snow may still exist at low elevations on all aspects. High elevation north aspects may have lingering wind slabs in immediate lee features. This overlies a surface hoar and sugary facet layer in sheltered locations.

A surface hoar and crust layer from January is buried around 80 to 140 cm in the southwest of the region. This layer still has the potential to be triggered from a thin snowpack spot, or with a large trigger like a cornice fall.

Sugary facets exist at the bottom of the snowpack in steep, rocky, and shallow snowpack areas.

Weather Forecast

Light snowfall on Tuesday ahead of what looks like significant snowfall on Thursday. Stay tuned!

TUESDAY: Scattered flurries (2-5 cm possible) / Moderate south westerly winds / Alpine temperature near -1 C / Freezing level 700 m.

WEDNESDAY: Cloudy with isolated flurries / Light south east winds / Alpine temperature -4 C / Freezing level 500 m.

THURSDAY: Heavy snow (15-30cm by day's end) / Strong east winds / Alpine temperature -4 C / Freezing level 300 m.

Danger Ratings Explained

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

2 - Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

3 - Considerable

Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.

Natural avalanches possible; human-triggered avalanches likely.

Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas.

4 - High

Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.

Natural avalanches likely; human-triggered avalanches very likely.

Large avalanches in many areas; or very large avalanches in specific areas.

5 - Extreme

Avoid all avalanche terrain.

Natural and human-triggered avalanches certain.

Large to very large avalanches in many areas.

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