Observation: Skyline

Observation Date
1/2/2019
Observer Name
Brett Kobernik
Region
Skyline
Location Name or Route
Skyline Region
Red Flags
Red Flags
Wind Loading
Red Flags Comments
On Wednesday I noted a minor amount snow getting drifted by northwest wind.
Avalanche Problem #1
Problem
Wind Drifted Snow
Problem #1 Comments
Wind drifted snow along the higher peaks and ridgelines is our biggest concern at this point. A handful of small snowmobile triggered avalanches have been reported to me this week. These were on steep high elevation slopes where the wind has drifted snow. The avalanches haven't been real big but enough to perhaps catch a person if they are off guard.
Comments
I took a look at the snowpack above Miller Flat on a north facing slope at 9850'. Overall, I liked what I found. Two things interested me.
  1. Status on weak sugar snow near the ground
  2. Any weakness in the mid portion of the snowpack from the dry period in mid December.
I was pleased with what I found near the ground. There was a small amount of old faceted sugar snow from early in the season. This layer has gained a lot of strength. I was still able to get it to propagate in Extended Column Tests but I had to force it with my boot before it would fail. Combine the strong bridge of snow that is above it and it seems quite unlikely that this is going to cause avalanches.
Looking at the layer of snow from mid December, it showed small faceted grains although they didn't alarm me at first glance. I performed ECT tests on this layer with no results. I did get all of the snow since the week before Christmas to fail and propagate (ECTP-25) above the layer I was concerned about. The failure did not involve the layer of snow I was looking at but rather failed on a wind crust above it. I am not all that concerned about this minor weakness. My hunch is that it will strengthen fairly quickly and won't pose a long term threat.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate