Observation: Summit

Location: Road Obs

Route & General Observations

Took photos of avalanche activity reported and observed along the corridor from Silvertip to Tenderfoot, including the large human triggered avalanche on Silvertip, a large slab avalanche on a gully sidewall below treeline (~1300′?) on Northern end of Summit Lake area, and several wet loose avalanches W aspects on Moose Mountain and Lonestar.

Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?No
Cracking (Shooting cracks)?No
Observer Comments

Large human triggered avalanche triggered yesterday on Silvertip. Large slab avalanche on South aspect on gully sidewall below treeline (~1300'?) on Northern end of Summit Lake area on East side of pass. Several wet loose avalanches from ridgelines on steep terrain on Westerly aspects on Moose Mountain and Lonestar. (See separate Summit Road Obs for photos).

Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.

Overcast skies at 12 pm turning to obscured skies at 4 pm. Calm winds at 12 pm becoming light around 3 pm and turning to moderate around 4 pm. Snowing less than 1 cm per hour starting at 3 pm, increasing to 1 cm per hour at 4 pm. Low 20s F at ridgetops and low 30s F increasing to upper 30s F at valley bottoms.

Snow surface

Not observed


Not observed

Photos & Video
Please upload photos below. Maximum of 5 megabytes per image. Click here for help on resizing images. If you are having trouble uploading please email images separately to staff.