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A lotta snow
Location Name:
Essex Creek
Observation date:
Monday, February 19, 2018 - 12:30
Is this an Avalanche Observation:
Yes
Observation made by:
Public
Location
Tabs
Quick Observation
Toured up the North aspect of Snowshed Mtn. Descended a W/NW aspect into Essex Creek.
Weather
Skies: Clear
Temperature: Below Freezing
Winds: Light Variable
Experienced minor collapsing in the 4500-5500' range as we climbed. No shooting cracks or signs of instability otherwise
Above 6000', ski penetration was waist deep and unconsolidated storm snow totaled in the 3ft range from Fri/Sat system.
Skied a short lap on an East facing aspect (7300-7000'); minor wind affect as the basin is rather sheltered.
Strong easterly winds from the Arctic intrusion were apparent on surrounding peaks (see photo). Surprisingly, very few naturals observed. I did notice a deep slab release off the South shoulder of Mt. Adams. (see photo) Forecaster Comment: This slide likely ran on 2/8/18. We first spotted it on 2/12/18.
Dropped into our run from a timbered saddle @ 7300', although the very-most upper section was loaded, we found unconsolidated storm snow a mere 50ft from the ridge.
As we descended:
-7000-6000: Plenty of sluff occurring, enough to knock a skier down. Mitigated the hazard by sticking to moderate slope angles.
-6000-4000': entered the "crust" zone, small storm slabs (30cm) were running atop a density change within the recent storm snow. We popped out of the trees for a bit and found minor soft slabs developing; they were easy to trigger in small confined pockets and ran very little distance (100-200ft).
As we toured out Essex Creek, most of the North chutes had D1-D2 piles of sluff from loose dry avys during the last storm cycle.
Snowpack, Avalanche, Weather Images:
Avalanche Details
Avalanche Details:
Date and Time of Avalanche:
Saturday, February 17, 2018 - 22:15
Avalanche Type:
Soft Slab
Failure Plane/Weak Layer:
Unknown
Trigger
Trigger:
natural
Terrain
Starting Elevation:
above-treeline
Size
Destructive Size:
D2 Could bury, injure, or kill a person.
Crown Height:
2 ft
Date and Time of Avalanche:
Saturday, February 17, 2018 - 22:15
Avalanche Type:
Loose Dry/ Sluff
Failure Plane/Weak Layer:
Within storm snow
Trigger
Trigger:
natural
Size
Destructive Size:
D1.5
Date and Time of Avalanche:
Thursday, February 8, 2018 - 02:15
Avalanche Type:
Hard Slab
Failure Plane/Weak Layer:
Old snow
More information or comments about the avalanche:
Mt. Adams
Trigger
Trigger:
natural
Terrain
Starting Elevation:
above-treeline
Size
Destructive Size:
D3 - Could destroy a car, a wood house, or snap trees
Relative Size:
R3 Medium
Crown Height:
6 ft
Avalanche Location:
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