Persistent Slabs
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 1–2
Avalanche forecast
View on mapSouthern San Juan
Colorado Avalanche Information Center
Avalanche danger
Mon
Tue
Alpine
3 · Considerable
Treeline
3 · Considerable
Below
2 · Moderate
Out of date — this forecast expired 7 months ago. You’re viewing past conditions, not the current bulletin.
Avalanche problems
Avalanche Summary
A Special Avalanche Advisory is in effect from Friday evening through Sunday for the San Juan Mountains. A winter storm will dramatically change conditions, making it easy for backcountry travelers to trigger dangerous avalanches this weekend.
You can trigger avalanches where you find more than around 8 inches of snow that has formed into a cohesive slab on slopes steeper than about 35 degrees. Watch for cracking in the snow as an indication that a slab has developed. If you experience this sign of unstable snow, avoid steep slopes.
Once the recent snow forms a slab over what was a very weak snowpack, avalanches could be triggered from a distance or from below.