Provo

Problemi valanghivi

• 

  Persistent Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alta quota
  • Limite del bosco
  • Sotto il limite del bosco

  Probabilità

  Possible

  Dimensione

  4

  The snowpack is adjusting to last week's heavy new snow and becoming more and more stable every day. However, the poor snowpack structure of really strong snow over weak snow remains in many places across the mountains. The most suspect slopes will continue to be on the north half of the compass including southeast and/or in areas where the snowpack is shallow. Steep rocky terrain or terrain that has previously avalanched will also be more suspect to avalanching.

  The likelihood of triggering a deep and dangerous avalanche is going down, BUT if you do trigger an avalanche on any faceted weak layer, it's likely going to be unsurvivable. These avalanches are tree snapping, bone-crushing avalanches that shouldn't be messed with. We have entered the era of low probability, high consequence.

  Personally, I am not ready nor willing to trust steep northerly terrain. I am fine with waiting. This is one of those years where the snowpack is dangerous, and avoidance is key. It will be hard not to be lured into steeper terrain because the snow and powder will be very enticing. I am not writing this and heading out the door to ride steep lines. All of us at the UAC are being very patient and avoiding avalanche terrain. Every professional I've talked with over the past week is also being very conservative and giving this snowpack time to heal. If you are heading into the backcountry, here are a few tips and reminders:

  • Before committing to any steep slope -dig down (in a safe location), and if you see weak facets in the snowpack, then avoid that terrain.
  • Choose a completely safe uptrack. You are often more vulnerable while ascending.
  • Expose only one person at a time and keep tabs on people all the time. Keep people in places ready to aid in a rescue if needed, but remember, 1 out of 4 people die before the avalanche stops.
  • Know what's above and connected to you - these avalanches can be triggered from a distance or below.
  • Slope cuts and cornice drops can be dangerous and dangerously misleading indicators of stability.

  If all of this sounds confusing and hard to understand (it's okay) - take a step back and only ride in terrain that's under 30 degrees in steepness and continue to avoid avalanche terrain altogether. (my plan)

• 

  Wind Slabs

  N

  NE

  E

  SE

  S

  SW

  W

  NW

  • Alta quota
  • Limite del bosco
  • Sotto il limite del bosco

  Probabilità

  Possible

  Dimensione

  2

  The past few days, the winds have been from the northwest and blowing with elevated wind speeds that drifted snow on many aspects at the mid and upper elevations. Overnight the winds veered to the northeast and are blowing 10-20 mph across the upper elevation terrain. I don't expect these northeast winds to change much out in the mountains, but wind drifted snow should always be on your radar.

  Remember, winds can deposit the lingering snow around terrain features on almost any aspect, called cross-loading. For this reason, I would expect to find hard or soft slabs of wind drifted snow at all upper elevations and on leeward mid-elevation slopes, especially along with terrain features such as ridgelines, sub ridges, and gullies. As always, look for and avoid slopes that look rounded, pillowy, or sound hollow.

  Cornices have grown to an unmanageable size. Stay well back from - and avoid travel below - corniced ridges.