Lawine

White Pass backcountry

Dallas GlassWest Slopes South
Auf der Karte ansehen
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Quick report

Wow! It's deep! I mean really deep. At middle elevations, there's typically 5 feet of settled snow over the 3/8 crust. It's so deep that travel was very difficult. 

The stormy weather definitely limited observations. However, despite viewing several avalanche paths on various aspects at middle elevations, we only found one small natural storm slab. Even still, with all the interstorm layers, we weren't willing to travel on or under any large slopes. 

Treebombs and deep snow were also very notable hazards today. Some of the tree bombs brought huge branches down with them. At times, it was scary, even in the forest. 

No notable cracking or collapsing

Weather

Air Temp
30
Cloud Cover
obscured
Wind Loading
moderate
Rain Elevation
4000
Recent Snowfall
150
Snow Avail For Transport
large amounts

It was a very very very stormy day in the White Pass backcountry. Heavy snowfall rates of 1-2 inches per hour were sustained throughout the day. Moderate to occasionally strong winds were common.

Snowpack

It's hard to say too much about all the recent snow. Several interstorm layers are visible and discernible in snowpack tests. However, none showed sudden failures, nor the potential to propagate. Here's a rundown of major layer depths by elevation. 

  • 6400ft: 3/8 down 155-170cm, 3/12 down 75-80cm
  • 5850ft: 3/8 down 155-165 cm, 3/12 down 75-80cm
  • 5500ft: 3/8 down 130-140cm, 3/12 down 65-70cm
  • 4900ft: 3/8 down 120-130cm, 3/12 down 60-65cm

The 3/12 was a discernible crust at 5500 ft, but not at 5800ft. 

Winds were definitely shaping the snowpack at middle and upper elevations. Drifts and blowing snow were common, however, the distrabution of the snow over the 3/8 crust was not generaly affected. 

The snow became notably heavier and more moist below 5000ft. Conversely, it was much drier above 5500ft. 

Wet snow issues were really limited to near and below 4500ft at White Pass. 

Avalanche

We were able to view several startones at middle and lower elevations. The only avalanche we found was a small natural storm slab avalanche, likely triggered by loose snow falling off Gunsight Peak. At and below Pass level, natural wet loose slides ran on many of the road cuts and highway paths. They were all small, however some included rocks and dirt.