Avalanche Forecast

Lizard Range and Flathead

Date issued

Mar 22, 2018 - 3:20 PM

Valid until

Mar 23, 2018 - 2:00 PM

Prepared by

swerner

Storm slabs will likely be reactive to skier and rider triggers. Changing winds from the East to the Southwest will potentially form wind slabs on most aspects.

Regular season
Thursday - March 22, 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

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.

Below Treeline

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.

Friday - March 23, 2018
Alpine

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.

Treeline

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.

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.

Saturday - March 24, 2018
Alpine

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.

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.

Avalanche Problem 1: Storm Slabs

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

The new snow may not bond well to the plethora of underlying surfaces, especially where it sits on a slippery melt-freeze crust or surface hoar on northerly aspects in upper elevations.

Travel and Terrain Advice
  • Use caution in lee areas in the alpine and tree line, especially on NE-E facing slopes.
  • Avoid large slopes and convex features.
  • Use ridges or ribs to avoid pockets of wind loaded snow.

Avalanche Problem 2: Loose Wet

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

Loose wet avalanches may occur below treeline due to higher freezing levels and rain.

Travel and Terrain Advice
  • Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.

Avalanche Summary

No recent avalanches reported on Thursday. Wednesday, several natural loose wet releases from sunny aspects and loose dry from northerly aspects were reported up to size 1.
The avalanche hazard will rise with forecast wind and precipitation.

Snowpack Summary

Up to 10 cm of new snow will likely have a poor bond to the plethora of old snow surfaces including a melt-freeze crust on sunny aspects, surface hoar on north aspects above 1600 m and moist snow surfaces below 1600 m. Isolated wind slabs are building on most aspects due to the changing winds and overhanging cornices exist along ridgelines.

Deeper in the snowpack, the mid-December and late-November weak layers are composed of crusts and sugary facets, which are down 150-300 cm. These layers are currently dormant.

Weather Forecast

Overnight Thursday: New snow 5-10 cm accompanied by strong southwest winds and freezing level at valley bottom.

Friday: Cloudy with sunny periods. Snow 2-10 cm possible, but low confidence with actuals. Ridgetop winds light gusting strong from the southwest. Alpine temperatures near -2 and freezing levels 1500 m.

Saturday: Mix of sun and cloud. Snow amounts near 5 cm and ridgetop wind strong from the southwest. Alpine temperatures near -3 and freezing levels 1500 m.

Sunday: Mix of sun and cloud. Freezing levels near 1300 m. Ridgetop winds mostly light with strong gusts from the southwest.

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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