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Observation: Mirror Lake Highway

Observation Date
1/15/2017
Observer Name
Mark Staples
Region
Uintas » Mirror Lake Highway
Location Name or Route
West of Mirror Lake Highway
Weather
Sky
Clear
Weather Comments
Temps soared and the sun felt pretty hot. Winds were dead calm. Otherwise absolutely beautiful day.
Snow Characteristics
Snow Characteristics Comments

The snow surface got a little wet on S aspects and stayed dry on N aspects. There is widespread surface hoar and near surface facets. These may get destroyed. What concerns me are small facets under a thin crust. On due south these are likely melting. However on slopes like ENE, they have gotten just enough sun to have a crust and facets but not enough to make it go away. Shaded slopes don't have a crust and just have good riding.

Avalanche Problem #1
Problem
Wet Snow
Trend
Same
Problem #1 Comments

I'm not listing this in order of importance. There were some roller balls and pinwheels and very small point releases coming off rocky, south facing slopes. Despite warm temps, strong sunshine and calm winds, the snow didn't heat up too much.

Avalanche Problem #2
Problem
Persistent Weak Layer
Trend
Decreasing Danger
Problem #2 Comments

This problem is hard to find. I couldn't find any spot where layers in the snow concerned me. However, the layers I have seen on two trips to this area seem like they could be a problem in isolated areas. They were not buried deeply a week ago. Now any problem layers are buried over a meter deep.

Comments

I dug multiple snowpits at many elevations and aspects. Some were on similar aspects and elevations to the recent avalanche that injured and buried 2 snowboarders. That slope is circled in the photo. Nothing I found concerned me, so maybe it's an isolated problem? The main concern could become the snow surface.

The first three pit profiles are from relatively low elevations. The first one shows a very thick crust formed when some of last weeks precipitation fell as rain at this location. The other pits have a slight crust.

The pit graph and the two photos are from the same location. You can see the ECT that broke on 26 hits but did not propagate across.

At 10,100 feet, on a north aspect the snow depth was over 2.5 meters (over 8 ft) deep. Coverage in the Uinta Mountains is unbelievable.

Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate