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Observation: Snowbird periphery

Observation Date
4/26/2018
Observer Name
B
Region
Salt Lake » Little Cottonwood Canyon » Snowbird periphery
Location Name or Route
Snowbird Periphery
Weather
Sky
Clear
Wind Direction
Southeast
Wind Speed
Light
Weather Comments
Early morning temperatures dipped close to freezing with daytime highs skyrocketing to 50 plus above 10,000. Light SE winds only perceptable on the hightest ridgelines.
Snow Characteristics
Snow Surface Conditions
Melt-Freeze Crust
Damp
Snow Characteristics Comments

Damp probably isn't the right description for the snow surface and below, and wet or saturated would be a more correct descriptor. Boot pen at least 25 cm by noon, and ski pen ranged from 7 cm to much deeper later in the day. Fortunately the snowpack appears to have made a significant transition towards a true spring pack; and with the last two evenings of clear skies there have been solid refreezes, Mostly supportable "Shmoo" was observed out there on all aspects and elevations. The smoother the surface the better the riding, and old tracks and "clinkers" need to be avoided if possible.

Two items are of note: 1) Stream flows over the past two days have ramped up considerbly and on Wednesday the stream was very muddy. 2) Snowpack temperatures are indicating an isothermal pack as high as 10,300 on northerly aspects.

Red Flags
Red Flags
Recent Avalanches
Rapid Warming
Red Flags Comments
MInimal wet loose observed over the past two days. Yet, the temperatures and depth of the wet grains in the upper snowpack appear to be a red flag for the possibility of initiating a wet slide that could potentially entrain signifcant amounts of snow on steep slopes nearing 40 degrees and greater during the daytime heating periods.
Avalanche Problem #1
Problem
Wet Snow
Trend
Increasing Danger
Problem #1 Comments

See above. With the temperatures forecast to continue to be unseasonably warm, plus the combination of warmer evenings and a lack of refreeze this problem may esclate over the next 48 hours. And any sustained periods of lack of refreeze may help initiate wet slab potential by the middle of the weekend.

Avalanche Problem #2
Problem
Cornice
Trend
Increasing Danger
Problem #2 Comments

Any cornices may be suspect for the next 72 hours.

Moderate with daytime heating appears to be danger, and it may escalate by Saturday late afternoon into evening. Fortunately it appears that temperatures will lower by Sunday.

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