| Trigger | Natural | Remote Trigger | 0 |
| Avalanche Type | Unknown | Aspect | Northwest |
| Elevation | 3500ft | Slope Angle | unknown |
| Crown Depth | unknown | Width | unknown |
| Vertical Run | unknown |
Avalanche: Summit
Location: Road obs Summit Lake
Strong ridgetop winds and active wind loading caused natural avalanche activity throughout Summit Lake zone. I observed an avalanche in motion on the NW face of Moose Mountain. See photo series below. Winds were from a Southerly direction, but also shifted at times from the West, both unusual wind directions for this area. Northern aspects appeared to have the most wind loading during the 2 hours I was in this zone. There were natural avalanches on North, West, and South aspects throughout Summit.
Avalanche Details
Witnessed one natural avalanche triggered by active wind loading on Moose Mnt.
Obvious signs of instability
| Recent Avalanches? | Yes |
| Collapsing (Whumphing)? | No |
| Cracking (Shooting cracks)? | No |
Observer Comments
Numerous natural avalanches (D2 - D3) on:
Moose Mnt (NW and SW aspects)
Twin (W)
Lonestar (W)
Butch (W)
Tri-Tip (W)
Active wind loading on all ridges - very large plumes
Weather
Southerly winds that shifted at time (40s' gusting 60mph)
30F
4" new snow from overnight
Patches of sun
NW shoulder of Moose Mountain. Took a photo of very large plume loading a Northern aspect
Seconds after the photo above, an natural avalanche was observed on the NW shoulder of Moose Mountain.
Powder cloud was impressive!
West aspect of Tri-Tip had multiple crowns. Its hard to see in this photo, but crowns stepped to the ground in a few places.
Large crown on the west face of Lonestar Peak, with multiple crowns along the Southern terrain of Twin in the background.
Large crown on Lodestar, W aspect
Crown on the SW shoulder of Moose Mountain
NW facing ridge on Butch
Winds were stripping Southern aspects, which is an unusual wind direction for our region.