Date issued

Apr 21, 2018 - 3:00 PM

Valid until

Apr 22, 2018 - 2:00 PM

Prepared by

matt.mueller

Spring has sprung! The snowpack is now considered to be in "spring conditions". This means it will swing from low avalanche hazard in the morning to high avalanche hazard as the snowpack warms. Starting early is critical to safe mountain travel.

Spring Season Conditions

Avalanche Problem 1: Loose Wet

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

Sun, warm temps and rain will contribute to loose wet avalanche. Avoid avalanche terrain when any of those conditions exist.

Travel and Terrain Advice
  • If triggered the loose wet sluffs may step down to deeper layers resulting in large avalanches.

Avalanche Problem 2: Cornices

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

This year's crop is the biggest in recent memory. Give them lots of respect, regardless if it sunny or not. Avoid being under, or on top of them.

Travel and Terrain Advice
  • Pay attention to overhead hazards like cornices which could easily trigger persistent slabs.
  • Give cornices a wide berth when travelling on or below ridges.

Avalanche Summary

Nothing new today.

Snowpack Summary

The forecasted storm lacked the punch we were expecting. Crusts and cornices are the main concern at the moment, and for the rest of the spring. Any new snow that does come in will sit on a crust and will be reactive for a day or two after the snow. As we move through spring, temperatures largely dictate the snow stability and avalanche hazard. Once the frozen snowpack warms up and melts, hazard will rapidly increase.  Future storms will certainly offer more snow, but these will only pose short term concerns immediately after, or during the storm.

Weather Forecast

The next week we will settle into a spring weather pattern. Warm days and cool nights will put the snowpack through a daily freeze/thaw cycle.

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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