A persistent weak layer of faceted snow still exists near treeline and above on NW-N-NE-E aspects beneath a slab that is 2'-3' thick. Time and recent warm temperatures have helped this layer to gain strength. Yesterday I found a strong, stiff slab overlying the weak layer. The buried weak layer did not react to stability testing yesterday, but we're not entirely out of the woods yet. The weekend heat wave was an unusual and significant event and I'd like to see a few more snowpits that show strong snow and no failures. For now, you should expect some lingering instabilities involving this buried persistent weak layer. I am most suspect of sparsely treed areas right around treeline. Other spots where you could possibly trigger this layer include shallow snowpack areas, near rock outcroppings, and gully walls.

For more details check out my observation from yesterday's field work.

Be on the lookout for recently deposited wind slabs on all aspects above treeline. The new snow came in with strong winds from the South, which have now shifted to the North and continue to blow. Expect to find fresh drifts right below ridge lines. This problem should be easily managed today. Wind drifted snow will have a smooth, rounded appearance and cracking is a sign of instability.