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Avalanche Forecast

Archived

Mar 29th, 2026–Mar 30th, 2026

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely.
Below Treeline
Below Threshold.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely.
Below Treeline
Below Threshold.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Below Threshold.

Regions

Haines Pass, Chilkat Pass.

A dangerous, persistent weak layer remains the primary concern in the alpine

Make conservative terrain choices and avoid overhead hazards.

Confidence

Moderate

  • We are confident that there are persistent slabs in the snowpack, but uncertain about how likely they are to trigger.

Avalanche Summary

Friday & Saturday

  • Several naturally triggered size 1-2.5 slabs were observed on east through south aspects, at 1400 m and below.

Wednesday,

  • The field team saw both natural and rider-triggered slabs, see photos below.

Tuesday

  • Multiple widely propagating natural avalanches were observed, and a cornice was remotely triggered by sledders. More in this MIN.

Snowpack Summary

At ridgeline and in exposed terrain, strong winds have left slabs and hard wind-pressed surfaces. Soft snow may still be found in wind-sheltered areas.

A persistent weak layer of facets and a crust is buried 80 to 150+ cm and extends up to around 1400 m. It continues to show reactivity in snowpack tests, and recent avalanches have failed on it. With the depth of this layer, the greatest concern for triggering is in shallow, thin to thick snowpack areas or from a large trigger, such as a cornice fall. It also appears to be most reactive in areas closest to the coast, with diminished reactivity further inland.

Weather Summary

Sunday Night
Clear skies. 10 km/h southwest ridgetop wind. Treeline temperature -12 °C.

Monday
Sunny. 10 km/h southwest ridgetop wind. Treeline temperature -12 °C.

Tuesday
Mix of sun and clouds. 20 km/h southeast ridgetop wind. Treeline temperature -9 °C.

Wednesday
Mostly sunny. 10 km/h southeast ridgetop wind. Treeline temperature -8 °C.





More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Stay off recently wind loaded slopes until they have had a chance to stabilize.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.