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Observation: Big Springs

Observation Date
2/25/2023
Observer Name
Staples, Kelly
Region
Provo » Provo Canyon » South Fork Provo R. » Big Springs
Location Name or Route
South Fork Provo River, Big Springs
Weather
Sky
Clear
Weather Comments
High thin clouds moved in throughout the day. Winds were calm to light. We noted some rollerball activity on southerly facing slopes around 8000'
Snow Characteristics
New Snow Density
Medium
Snow Surface Conditions
Powder
Snow Characteristics Comments
New snow had settled out to medium dense powder on north-east aspects. Southwest aspects around 9100' skied well. Below 7000' the snow was damp and will be a refrozen mess in the morning.
Photo of settlement around the base of aspen trees at 7100'.
Photo of surface conditions on a west facing ridgeline.
Avalanche Problem #1
Problem
Wind Drifted Snow
Trend
Decreasing Danger
Problem #1 Comments
Photo of small wind-drifted snow avalanche at 9100' on a northwest facing slope.
Avalanche Problem #2
Problem
New Snow
Trend
Decreasing Danger
Problem #2 Comments
We noted signs of recent avalanche activity that occurred most likely February 21-23 on the southeast side of Cascade Ridge. We observed one mid-slope avalanche around 7800' on a northeast facing slope that stood out because it was mid-slope and did not entrain the snow above. This smaller avalanche on the northeast facing slope is the isolated kind that can only be identified by looking in the exact locations you want to travel or to continue to avoid steep terrain as this isolated inconsistency within the new/old snow interface continues to settle out.
Comments
We dug a number of snowpits on various aspects and elevations to determine how the new snow had bonded to the old snow, if there were any weak interfaces, and if wind-drifted snow had created any slabs at lower elevations.
There are isolated areas where you may find faceted or rounding faceted crystals at the interface of the new/old snow. These may or may not be associated with a crust and I would continue to dig down to determine how reactive these layers are and if you are getting propagation with snowpack tests prior to committing to a slope. These instabilities will most likely settle out and I will continue to look for them as long as we are seeing avalanche activity.
The N facing pit at 7600 ft was interesting. In the first ECT, it propagated on 28 taps with an audible pop about 2 feet deep. Then the second one wouldn't break at all. This seems so typical of what we've been seeing as we've been hunting for weaknesses in the snowpack.
The danger felt overall Moderate where we traveled. Not game on by any means with the avalanches we spotted. But we felt comfortable traveling under steep terrain. Riding steep terrain involves two steps for me (1) is avoiding obviously wind loaded locations, and (2) is checking for any weak layers within the upper 2-3 feet of the snowpack. There are some isolated, non-wind loaded slopes that could produce a soft slab avalanche. My guess is that these would be maybe 50' wide and 2' deep. These locations seem very spotty but are out there.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate
Coordinates