Northwest Avalanche Center

Observation: Public

All Observations

Observation Details

Name:
Benjamin R Eyer
Observation Date:
December 17, 2022
Submitted:
December 17, 2022
Zone or Region:
Mt Hood
Activity:
Skiing/Snowboarding
Location:
Tilly Jane Snow Park, Cloud Cap Rd, Mt Hood, OR 97041

Observed Avalanches

Did you observe any avalanches? 
Yes
Avalanche Type:
Hard Slab
Size:
Size 2: Could bury, injure, or kill a person
Elevation:
5800 ft
Aspect:
N
Comments:
Observed several slab avalanches that appeared to be older on the far side of Polallie canyon from the Tilly Jane Trail uptrack

Signs of Unstable Snow

Did you see shooting cracks? 
Yes, Isolated
Did you experience collapsing or whumpfing? 
No

Observations

Started at 9 am and toured up Tilly Jane from the snowpark with the goal of skiing some good snow on N/NE aspects while avoiding avalanche terrain. Dug a pit around 6200 ft to fine SH layer. Found good snow holding and high winds that forced us to turn around in the alpine around 7000 ft just before the shelter. Lots of wind transport on the upper mountain shown in the attached pictures but winds were mellow below 6600 ft. Did find some wind slab evidence with probing with a weak/strong/weak layering in the alpine.

Media

Public Field Report: Tilly Jane Snow Park, Cloud Cap Rd, Mt Hood, OR 97041
Wind transport on upper mountain observed from 6300 ft.  While the wind has high and we turned around, there was not much snow moving locally
Wind transport on upper mountain observed from 6300 ft.  While the wind has high and we turned around, there was not much snow moving locally

Advanced Observations

Observed Avalanche Problem #1: 
Persistent Slab
Comments: 
Dug a pit to find the PWL of SH around 6200 ft near the Polallie canyon on the Tilly Jane uptrack on NE aspect in an open meadow. Found the layer 70 cm down (4 inch of F and 12-14 inch of 4F above SH layer) but were not able to trigger with a column test. Climbing above with skis on and jumping on the column did cause propagation. Seems possible to trigger but grains did not seem as sugary.
WordPress Lightbox