| Trigger | Natural | Remote Trigger | Unknown |
| Avalanche Type | Hard Slab | Aspect | East |
| Elevation | 4000ft | Slope Angle | 40deg |
| Crown Depth | unknown | Width | 500ft |
| Vertical Run | unknown |
Avalanche: Seward
Location: Lost Lake
Numerous fresh natural windslab avalanches observed on Sunday on south through east facing aspects. One propagated 500+ feet wide. Crown depth unknown but deep enough to be highly visible from a distance.
Avalanche Details
The largest windslab observed occurred on E facing aspect at 4000 ft on the far east face of Mt. Ascension (Peak 5151 according to Caltopo).
Obvious signs of instability
| Recent Avalanches? | Yes |
| Collapsing (Whumphing)? | No |
| Cracking (Shooting cracks)? | No |
Observer Comments
Active wind loading from northerly winds Saturday and Sunday. Small shooting cracks in windloaded pockets on small slopes. Intentionally triggered very small wind slabs on small test slopes on loaded convexities.
Weather
Sunday was clear with comfortable temps in 20s. Strong winds had scoured all slopes near and above treeline. Much better riding conditions Saturday but with worse vis.
Snow surface
Wind hammered anywhere the wind touched it. Waist deep powder elsewhere.
Large wind slab Peak 5151 E aspect 4000 ft.
Smaller windslabs Mt. Ascension E aspect 3500 ft.
Strong northerly winds creating plumes