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Avalanche Forecast

Archived

Apr 6th, 2026–Apr 7th, 2026

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

Regions

Haines Pass, Chilkat Pass.

Moderate slope angles with thick, consistent snowpack remain your best defense against triggering storm slabs or the deeper, more destructive persistent weak layer below.

Confidence

Low

  • We are uncertain due to a limited number of field observations.
  • We are uncertain about how quickly persistent slabs are gaining strength.

Avalanche Summary

No new avalanche activity has been reported.

We suspect that recently accumulated storm snow may be reactive to human triggering especially where it has been wind-affected.

Snowpack Summary

Roughly 20 cm of new storm snow has further buried old wind affected surfaces in exposed terrain and adds to softer snow found in sheltered areas or faceted northerly aspects.

On sun exposed slopes a sun crust can be found below the most recent storm snow.

A persistent weak layer of facets and crust is buried 80 to 150 cm deep, extending up to about 1400 m. The greatest concern for triggering comes from large loads, such as cornice falls, or from human triggering in areas where the snowpack transitions from thin to thick.

Weather Summary

Monday Night
Mostly cloudy. 10 km/h west ridgetop wind. Treeline temperature -3 °C.

Tuesday
Mostly cloudy. 20 km/h west ridgetop wind. Treeline temperature -5 °C.

Wednesday
Mostly cloudy. 1 cm of snow. 30 km/h west ridgetop wind. Treeline temperature -6 °C.

Thursday
Mostly cloudy. 5 to 10 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -4 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • 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.

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.