Observation Date
4/9/2014
Observer Name
Bruce Tremper
Region
Salt Lake » Little Cottonwood Canyon » Grizzly Gulch
Location Name or Route
Quick trip up Grizzly Gulch
Weather
Sky
Clear
Wind Speed
Moderate
Weather Comments
Sunny and very warm again. The ridge top winds were blowing at moderat speeds, which helped to keep things a little cooler and there was a better refreeze last night than the night before.
Snow Characteristics
Snow Characteristics Comments

The snow surfaces reportedly became breakable by about 10 am. I went up for a quick trip in the afternoon just to look at wet snow activity so I did not expect the snow to be very good and it did not disappoint. It was pretty horrid, sinking into wet snow on all the slopes. As usual, you need to get it quick in the morning and be off of the snow by mid morning.

Red Flags
Red Flags
Recent Avalanches
Red Flags Comments
Only red flags are wet avalanches and continued thaw.
Avalanche Problem #1
Problem
Wet Snow
Problem #1 Comments

The main problem is wet avalanche activity from the prolonged warming . Most of the activity has probably alread occurred but this is the first time this snowpack has undergone a prolonged thaw with percolating melt water, so you always have to be a bit suspicious of deeper weak layers that can be activated by becoming wet for the first time. Luckily, our snowpack is fairly stable but in the thinner snowpack areas we could have some monkey business going on with faceted snow becoming wet, which is always a danger.

The north facing slopes above about 9,000' remain dry under a thinner skin of damp snow on the surface. But the lower elevation north faces seem to be going through a minor wet cycle. Most of the southerlly facing slopes have been sluffing and producing roller balls for the past 3 days and I suspect that most of the activity is probably already occurred but Friday is supposed to be the hottest day of this warming so we should continue to avoid being on or underneath steep slopes when they get wet in the mid day to afternoon.

The water seems to be pooling within the recent, finer-grained snow just above the dusty layer of more mature melt-freeze snow buried about a foot down in the snowpack. I was getting collapsing on that layer in the compression tests and it's the layer that shears off, but with a hard shear. In the steeper terrain where slabs have been occurring, I suspect it's on this layer.

Comments

Here are a couple more photos of recent snow surface conditions and wet activity from the past few days.

Roller balls on the northwest face of Millicent Peak

More larger, wet sluffs on the south face of Superior. Many of the wet sluffs are coming from point releases from the rocks heating up in the sun.

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