Date of Observation: 05/21/2023
Name: Turner Peterson
Zone: Southeast Mountains
Route Description: Whetstone
Observed avalanche activity: Yes
Avalanches: More whetstone NE/E wet slabs lake bowl
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Date of Observation: 05/18/2023
Name: Zach Guy
Zone: Northwest Mountains
Route Description: Scarp Ridge, viewed from Snodgrass TH
Observed avalanche activity: Yes
Avalanches: A pair of large wet avalanches ran sometime since I had views of that area yesterday at noon. They appear to be cornice-triggered wet slabs
Photos:
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Date of Observation: 05/17/2023
Name: Zach Guy
Zone: Southeast Mountains
Route Description: M Face on Whetstone. Viewed from Mt. CB
Observed avalanche activity: Yes
Avalanches: Another fresh wet slab on Whetstone. M Face ran sometime this afternoon.
Photos:
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Date of Observation: 05/17/2023
Name: Zach Guy
Zone: Southeast Mountains
Route Description: Gothic Peak, traveled on southerly and easterly aspects to 12,600′
Observed avalanche activity: Yes
Avalanches: The bulk of recent avalanches have been D1-1.5 wet loose on northerly aspects N/ATL, where the snow is still in a transitional phase.
Weather: Scarp Ridge (@12k) had a minimum temp of 37 last night under clear skies. Mountain temps rose to the mid 40’s to mid 50’s, with partly cloudy skies developing by mid day. Calm winds where we traveled.
Snowpack: About 5″ refreeze which was just enough for mostly supportive boot pen and supportive ski pen before sunrise. Good corn around 8:30 a.m. on easterly aspects. Once crusts broke down later in the morning, ski pen became trapdoor near rocky areas and trees. It was easy to trigger small wet loose avalanches, but they didn’t gain volume; just ran slowly down existing runnels. Cornices are still big and saggy looking; we chose routes that avoided being underneath them given the warm day.
Photos:
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Date of Observation: 05/16/2023
Name: Zach Guy
Zone: Southeast Mountains
Route Description: Whetstone. Viewed from town.
Observed avalanche activity: Yes
Avalanches: Two large wet slabs ran today, adjacent to but independent of each other in Barcelona Bowl, probably cornice triggered.
Weather:
Snowpack:
Photos:
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Date of Observation: 05/10/2023
Name: Zach Guy
Zone: Southeast Mountains
Route Description: Copper Creek and West Brush Creek areas, viewed from Whiterock
Observed avalanche activity: Yes
Avalanches: Numerous previously undocumented D2 to D3 wet slabs likely ran during our April 9 to April 13 wet cycle. I coded their failure dates during the peak of the cycle 4/10 – 4/11, although I suspect activity was distributed across a wider date range than that.
Photos:
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Date of Observation: 05/10/2023
Name: Zach Guy
Zone: Southeast Mountains
Route Description: Copper Creek area
Observed avalanche activity: Yes
Avalanches: Numerous previously undocumented D2 to D3 wet slabs likely ran during our April 9 to April 13 wet cycle. I coded their failure dates during the peak of the cycle 4/10 – 4/11, although I suspect activity was distributed across a wider date range than that.
Photos:
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Date of Observation: 05/12/2023
Name: Zach Guy
Zone: Northwest Mountains
Route Description: Mt. Axtell 4th Bowl
Observed avalanche activity: Yes
Avalanches: A recent-looking large wet slab in Evan’s Basin. I’m guessing it ran sometime in the past few days.
Weather: Partly cloudy skies. Light northeast winds.
Snowpack: Less than 1″ of new snow above 10k, with isolated drifts up to 5″ from northeasterly winds ATL. Marginal refreeze due to last night’s cloud cover and insulating new snow, but the snow surface remained supportive under skis with good corn-like skiing through 9:30 a.m on northeast aspects. No signs of instability this morning.
Photos:
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Date of Observation: 05/09/2023
Name: Zach Guy
Zone: Southeast Mountains
Route Description: Red Ridge to Queen Basin to Whiterock Mtn
Observed avalanche activity: Yes
Avalanches: Skier triggered and observed a few fresh natural wet loose avalanches on high, north-facing terrain up to D1.5 in size.
Numerous previously undocumented wet slabs from the April cycle, D2-D3. I’ll document those in a separate ob later this week.
Weather: Clear to few clouds, warm temps, light breeze.
Snowpack: Wet loose avalanches became reactive to ski cuts by mid day on ATL northerly terrain, where the top 6″ of dry powder was just now transitioning to wet snow. Elsewhere, the snow surface has matured through numerous melt-freeze cycles and wet loose avalanches appeared to be unreactive, even on steep terrain late in the day. The snow surface remained supportive to skis through 4 p.m. at all elevations except for a few spots near evergreen trees below treeline.
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Date of Observation: 05/07/2023
Name: Chris Martin
Zone: Northwest Mountains
Route Description: Today we traveled up Purples SE ridge to the top of the S couloirs and descended the couloirs with careful evaluation of snow totals and slab cohesion, with techniques that mitigated our exposure.
Observed avalanche activity: No
Avalanches: Dry loose, slow running
Weather: Low visibility, Light-Moderate winds and blowing snow. Cold.
We decided after last weeks warmup to wait for weather stations to reveal the refreeze this weekend and the cold temps that persisted throughout yesterday and today gave us the confidence to push into the alpine for today. The refreeze remains minimal below 2′ down on South Aspects.
Snowpack: 6-8″ of wind blown snow on top of a MfCr. We observed minimal and shallow cracking that remained local to the tips of our skis. The new snow seems to be bonding quite well to the old crust.
We observed pockets of deeper wind transported snow, we did not encounter anywhere these totals were connective across an entire slope as a recipe for propagation.
While traveling we also noticed the warm up from last week in the snowpack. Specifically on South aspects the freeze penetrated about 2 feet down from the past freezing temps since the morning of 5/4 and snow was moist/wet below that.
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