Public Observation #2023-1175

Observation Details

Submitted:
May 24, 2023 8:30 PM
Observation Date:
May 22, 2023
Zone or Region:
Central Cascades
Activity:
Skiing/Snowboarding
Location:
Middle and North Sister

Triggered Avalanches

Did you trigger any avalanches? 
Yes
Was it intentional? 
Yes
Avalanche Type:
Wet Loose
Size:
D1: Relatively harmless to people
Elevation:
10000
Aspect:
SE
Comments:
Diller Headwall sz 0.5 very small and slow moving loose avalanche, ran 1000 ft.

Observed Avalanches

Did you observe any avalanches? 
Yes
Avalanche Type:
Wet Slab
Size:
D3: Could bury and destroy a car, damage a truck, destroy a wood frame house, or break a few trees
Elevation:
9500
Aspect:
E
Comments:
East face of Middle Sister. Ran 1200+ feet. Approximately 400 feet wide. Crown depth varied from approximately 5-10 feet. Would call this a size 3.5.

Signs of Unstable Snow

None reported

Observations

More photos of the very large avalanche on the East face of Middle Sister

Media