Observation: Snowbasin

Observation Date
4/2/2020
Observer Name
Hardesty, Dye, Hall
Region
Ogden » Snowbasin
Location Name or Route
Snowbasin and periphery
Weather
Sky
Broken
Precipitation
Light Snowfall
Wind Direction
West
Wind Speed
Moderate
Weather Comments
Good to get out with SB patroller Jon Hall and Powder Mountain snow safety Nichole Dye. Broken to scattered to obscured with light snowfall during the afternoon. Good cold lock-up of the previous few days of mountain temps in the upper 30s to upper 40s. Temps in the teens.
Snow Characteristics
New Snow Depth
2"
New Snow Density
Medium
Snow Surface Conditions
Powder
Melt-Freeze Crust
Damp
Snow Characteristics Comments
Dry to damp couple inches on a supportable crust; easy travel; excellent riding on smooth underlying surfaces.
Red Flags
Red Flags Comments
See below
Avalanche Problem #1
Problem
Cornice
Trend
Same
Problem #1 Comments
If, as they say, that depth hoar was invented in the San Juans of southern Colorado, then it must be true that the great cornices of the world are forged along the Ogden Skyline.
SB patroller Ken Snoy's observation of cornice fall on Tuesday the 31st in the upper Middle Bowl Cirque followed by another large release in the Sisters/Strawberry area likely yesterday/Wednesday April 1. (1st two pics). These entrained some snow with them, mostly loose dry and perhaps a shallow wind slab; each leaving a size 1 or 2 debris pile. These cornices face generally east along the Snowbasin resort/Ogden Skyline.

Two snowshoers were ahead of us to gain the Strawberry ridgeline and we chose to look at the older debris pile from adjacent terrain. Despite the light snowfall and flat light, one of my partners pointed to the huge chunks of snow and loose snow debris now cascading down the slope...and seeing dark objects in with the debris (snow-shoers?), we made a hasty beacon search and looked through the shallow debris for what, thankfully, was nothing. Unknown trigger; perhaps the snowshoe party; perhaps just enough wind. Three good size cornice falls in three days along the Ogden Skyline.
Avalanche Problem #2
Problem
Persistent Weak Layer
Trend
Decreasing Danger
Problem #2 Comments
Looked for the buried facets, SH, and crust combination that was the culprit in last Friday's (March 27th) close call on No Name; and that observer Derek Debruin also found a few days later on the 30th. Neither we on the 27th nor Derek - with much testing and prodding - would elicit much of a response from this layering. Today I could not find any layering of great interest and could not even find the surface hoar.
Comments
Mostly Low danger in our terrain. Possible someone could trigger a shallow wind drift in very isolated terrain or shallow loose dry. Expect avalanche danger to be in lock-step with either storms or sun/warming in the next several days.
Today's Observed Danger Rating
Low
Tomorrows Estimated Danger Rating
None