Manto nivoso

Esha Peak -

Mike PhillipsEastside Region
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Quick report

I set out with low expectations and a conservative mindset this morning given the poor freezing conditions overnight. I was surprised by the surface conditions and the lack of observed instability. However, temps were rising quickly, the sun was strong and I heard a few cracks of rockfall in the distance. All good reasons to get down early according to plan.

  • Esha Canyon had a surprisingly good overnight surface freeze. The snow was hard and slick. I was still skittering around with ski crampons on until about 10000' where the east facing side of the canyon was approaching ripe corn conditions at 9:15.
  • East aspects at high elevation in this area catch strong morning sun early. I was sinking about 4" deep with my skis off at 10900' by 10:15.
    • I found 15 cm of very wet (soaking gloves) to wet (make a hard snowball) snow sitting on a 5cm thick, icy crust at this elevation.
  • I moved over to a North aspect at a similar elevation to compare. Here the surface snow was moist (make a snowball) 5-10 cm below the surface where it turned drier. 
    • Here I was sinking about 6" deep on foot and 2" on skis.
    • High elevation north aspects were a mix of dappled wind affect, old scabby wind board and discontinuous patches of thin, shiny sun crust.
  • The temperature was 48F at my highpoint of 11200' at 11:15 a.m.
  • I ski cut through a small bowl feature that faced North, then East. I saw no signs of instability on this test slope at 10900' around 11:15.
  • Skiing out there were several small cascades of water draining hanging snowfields on the ridge which divide Esha Canyon from McGee Creek. These were not active when I climbed the canyon early in the morning.
Observed recent, but not fresh, small loose wet avalanches (D1.5) on E aspect with start zones at approx. 10200'. There were several old, small loose wet avalanches on a variety of aspects at lower elevations. I started hearing small rock fall at 9:45. I timed it well to not directly experience any instability today, returning to the trailhead by noon. I expected to see more signs of instability earlier in the day given the cummulative effect of the recent warmth.

Weather

Air Temp
45F - 64F
Cloud Cover
clear

Clear skies, Light SW winds, rising temperatures.

Snowpack

High elevation N aspects on Esha Peak are still transitioning from dry winter snow. East aspects above 10000' are getting wet.