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Observation: Snowbasin Backcountry

Observation Date
4/10/2016
Observer Name
Bill Hunt
Region
Ogden » Snowbasin Backcountry
Location Name or Route
Snowbasin backcountry
Weather
Sky
Broken
Weather Comments
Another warm sunny day, with some cloud cover. Appears to have been about a half inch of snow last night at 9300'.
Snow Characteristics
New Snow Depth
1"
New Snow Density
High
Snow Characteristics Comments
I'm putting 1" because there is no 1/2". Warm, wet snow conditions.
Red Flags
Red Flags
Rapid Warming
Red Flags Comments
Its the sustained warm temps without a good refreeze for a few nights that make conditions too wet on days like today.
Avalanche Problem #1
Problem
Wet Snow
Trend
Same
Problem #1 Comments
There was a widespread wet slide cycle above 9000', yesterday afternoon it appears.
Avalanche Problem #2
Problem
Gliding Snow
Trend
Increasing Danger
Problem #2 Comments
Glide cracks are widening above 9000'. A lot of the steep lines around here are over rock slab, and I just don't trust those areas when the last solid overnight freeze was more than two nights ago.
Comments
Glide cracks in upper Mt Ogden bowl, 4/9/2016.
Its been about 4 days since the last solid overnight freeze. On the Ben Lomond snotel at 8000', it looks like early AM on 4/6/2016 was the last time the air temp was below 32 degrees. On 4/8/2016 around 10AM, I found stable enough conditions to get on a steep shaded north-facing line, around 9300'. Firm but not too icy. After that, its just been too warm.
4/9/2016, glide cracks in upper Mt Ogden bowl, around 9100-9200 feet. There was another wet slide cycle in this area that afternoon (photo 4/10/2016); not running too far, but pointing out the sloppy conditions, above 9000' on E and NE.
Since today was the last day for the Mt Allen tram, I went up Mt Allen on the existing boot trail, just to take in the view, mid-day. The existing boot was good, sinking in about 3-4". I didn't venture off the existing boot, but testing the slope by booting fresh areas a bit, was less than boot deep. Snow is melting and settling out fast. The west side of Mt Ogden is getting melted out up high (photo). Since John Paul is staying open (from what I heard today; things can change), Mt Ogden will remain open or closed as per the Avalanche Signline Gate Status sign at the top of John Paul. Its been closed for about a week. There were some brief openings from 10AM to 11:45AM or so. If we get a solid freeze, and then sun, we could see some short openings like that. Rollerballs were easily triggered today, N, 9400'. A careful descent did not trigger a pushalanche. Doesn't look like a freeze till Thursday... I'll be getting out on the rivers, since they are starting to run now, with this heat :-)
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate