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Observation: Mirror Lake Highway

Observation Date
12/17/2016
Observer Name
Mark Staples
Region
Uintas » Mirror Lake Highway
Location Name or Route
West of Mirror Lake Highway
Weather
Sky
Clear
Wind Speed
Calm
Weather Comments
Cloudy skies gave way to sunshine and rapidly dropping temps. The winds at 10,000 feet were dead calm
Snow Characteristics
New Snow Depth
5"
New Snow Density
Low
Snow Surface Conditions
Powder
Snow Characteristics Comments

About 5 inches of very low density fell last night at the tail end of this storm which deliver 2.8 inches of snow water equivalent over about 24 hours from Dec 15 to 16 (Trial Lk SNOTEL). Snow on the 15th was very wet and dense. There was a softer layer under this dense snow that you would break through if you stepped off your sled. That soft layer and all the new snow was rapidly settling and consolidating. The difference in riding conditions was very noticeable between morning and afternoon, as the new snow became much more supportable.

There was evidence of recent strong winds at ridgetops.

Red Flags
Red Flags
Heavy Snowfall
Red Flags Comments
We didn't observe any crackin in the new snow, but the recent storm and heavy snow is enough of a red flag.
Snow Profile
Aspect
West
Elevation
10,000'
Slope Angle
30°
Comments

We found solid snow in all our snowpits. Since just before Thanksgiving, we've been getting a pretty steady stream of snow. This is evident in the snowpack. There are few layers and there aren't big hardness differences. It's hard to find weak layers. The main one was within the storm snow, but that layer was consolidating throughout the day.

I was shocked to find 4 feet of snow on a SE aspect at 9800 feet. Test scores in this pit were all ECTN, which means in an Extended Column Test, layers would break, but the crack never propagated across the column of snow (a good sign). Coverage was incredible. See photo below from this snowpit.

HOWEVER, there is still weak faceted snow to be found near the ground. I would be nervous of any rocky area above treeline or parts of the range that are colder and generally have thinner snow. While the facets near the ground that I saw didn't look to bad, their very existence tells me that there are definitely places where they are weaker. With such a massive load of snow, I'd still be pretty nervous getting into avalanche terrain. If you trigger an avalanche, it could be deep and deadly.

We're off to a good start and the snowpack could become pretty stable if we are willing to be patient and wait for the danger to drop.

Video

The day started with deep riding conditions, but the snow settled quickly and a wide open throttle wasn't necessary any more. Is there a snowmobile in the photo?

A good gauge of the coverage is the slope in this photo. It's a boulder field. You can still hit a rock or two if you aren't careful, but we haven't had a start to the season like this in many years.

Even turbo sleds get stuck occasionally

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