Observation: Little Water

Observation Date
2/15/2019
Observer Name
Bruce Tremper
Region
Salt Lake » Big Cottonwood Canyon » Mill D North » Little Water
Location Name or Route
Little Water Peak
Weather
Sky
Clear
Wind Direction
West
Wind Speed
Strong
Weather Comments
Beautiful sunny weather most of the day but the clouds built rapidly towards the end of the day as the cold front approached. Winds became stronger as well with the approach of the front.
Snow Characteristics
New Snow Density
High
Snow Surface Conditions
Dense Loose
Snow Characteristics Comments
The snow was what we've become used to in February this year, very dense, rimed, supportable snow. But it actually is good turning conditions in wind and sun sheltered terrain at upper elevations. You only sink in perhaps 5 cm and it's fast and grippy. The rain fell up to around 8,000' yesterday and all aspects had a breakable crust so you had to get above about 8,500' for the snow to be turnable and above 9,000' to get good. Everything below that elevation was very challenging. There was a sun crust on steep, southerly slopes and quite a few wet rollerballs and sluffs from the rain below 8,000' including one recent one covering part of the BCC road today a little ways above the S-turns. The new snow should make lower elevation riding and turning conditions much better.
Red Flags
Red Flags
Wind Loading
Red Flags Comments
At least where I was, my only concern was the recent wind drifting. But as has often been the case this month, the snow is so dense that there's just not as much snow available for transport and it limits the amount deposited in lee terrain. But with dense snow comes a lot of weight and heft of any avalanche that you may be able to trigger. I get the feeling that you need to give it a pretty good thump to get much going because of the very dense snow. But wind loading was actively occurring today. I didn't take the time to create a snow profile graphic but I'll just discuss it here since the Snow Profile box does not allow freeform text: I dug a quick pit on the NW side of Little Water Peak around 9,400' in the aspen glades down off the ridge a couple hundred vertical feet in a wind protected area. The snowpack seems very homogenous and I couldn't even see or feel any layers in the top 120 cm of the snowpack where I tested. HS = 180cm. I did an Extended Column Test and got no shears or propagation. I did not dig to the ground but I could occasionally feel some weaker snow near the ground in places while probing with my ski pole while traveling especially at lower elevations. I suspect with such a deep, dense snowpack everywhere, there's no temperature gradients across the basal facet layers and they have gained a lot of strength. It seems like the thinner snowpack areas might be the only places where you could get it to break that deep or places with a huge amount of wind drifted load.
Avalanche Problem #1
Problem
Wind Drifted Snow
Trend
Same
Problem #1 Comments
Duplicate from the Red Flags above: At least where I was, my only concern was the recent wind drifting. But as has often been the case this month, the snow is so dense that there's just not as much snow available for transport and it limits the amount deposited in lee terrain. But with dense snow comes a lot of weight and heft of any avalanche that you may be able to trigger. I get the feeling that you need to give it a pretty good thump to get much going because of the very dense snow. But wind loading was actively occurring today.
Snow Profile
Aspect
Northwest
Elevation
9,400'
Slope Angle
25°
Comments
Here's some photos:
Photo 1: Reynolds Peak with a larger cornice on it than I've seen in some years. It looks like someone had been going along and kicking cornices along the part of it and only triggering very shallow slabs or sluffs.
Photo 2: A big, fresh cornice on the east face of Little Water Peak (Fire Water on the WBS app). I wanted to know if all the wind loading made another avalanche there since last week's slide but everything is still in place. No, you could not pay me enough to stomp around on that cornice or be on the slope below with all the wind loading in progress today as well as the past few days.
Photo 3: A view of Gobblers and Raymond--just to see some of the wind patterns.
Danger rating for today reflected the steep, recently wind loaded slopes where I was. Most of the other terrain was lower danger rating. I did not choose a danger rating for tomorrow because it all depends on how the storm comes in overnight.
Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
None
Coordinates