Avalanche: Summit

Location: Summit Lake and Moose Pass

Date:

May 17, 2023 9:52

Observer:

Heather Thamm

Route & General Observations

Drove through Summit Lake around 8pm. A number of very large wet avalanches released recently. When I drove through at 3pm I didn’t notice these, but visibility wasn’t very good. Light rain on/off all day today followed by clearing skis and partly sunny this evening.

Spirit Walker, Butch, and Andy Simmons all had large recent avalanche with large crowns.

Avalanche Details

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Trigger	Natural	Remote Trigger	Unknown
Avalanche Type	Wet Slab	Aspect	Unknown
Elevation	unknown	Slope Angle	unknown
Crown Depth	unknown	Width	unknown
Vertical Run	unknown

Avalanche Details

Numerous large to very large web slab avalanches occurred today in Summit Lake and Moose Pass.

Red Flags

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Obvious signs of instability

Recent Avalanches?	Yes
Collapsing (Whumphing)?	No
Cracking (Shooting cracks)?	No

Weather & Snow Characteristics

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Weather

Partly sunny this evening after light rain most of the day
Mid 40's
Calm

Photos & Video

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South aspect of Spirit Walker

North aspect of Butch

2 large avalanches on West aspect of Butch

Largest of the two on the west facing slopes of Butch

Second avalanche on West aspect of Butch

West aspect of Andy Simmons

Location

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