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Observation: North Ogden Divide

Observation Date
1/20/2017
Observer Name
Evelyn
Region
Ogden » North Ogden Canyon » North Ogden Divide
Location Name or Route
North Ogden Divide south to 7,600'
Weather
Sky
Obscured
Precipitation
Light Snowfall
Wind Speed
Calm
Weather Comments
Fog and light snow at the trailhead, mostly fog and stratus for the whole tour, with only a few short breaks.
Snow Characteristics
New Snow Depth
6"
New Snow Density
Medium
Snow Surface Conditions
Powder
Snow Characteristics Comments

6" of settled snow at the trail head, more like 4 to 5" up higher, especially along wind affected ridge line. New snow was moist (could easily make a snowball) at trailhead, drying with elevation. Excellent turning conditions.

Red Flags
Red Flags
Cracking
Poor Snowpack Structure
Comments

Dug in numerous places and did dozens of shovel tilt tests at a variety of elevations. Buried small near surface facets were widespread beneath the 4 - 6" of new snow. I couldn't find any buried surface hoar, except at the low elevation trail head (see below). But it didn't matter - the near surface facets themselves can form a dangerous weak layer.

It was easy to get cracking in the new snow down to the facets, interesting as the "slab" was so very thin and soft. Sensitive enough we avoided steep slopes. Whenever this snow pack gets additional snow and or loading from winds, (tomorrow or Sunday/Monday), I expect this weak layer to be sensitive, and slides could be triggered remotely.

Photos below of the buried surface hoar at 6,200'. Upper photo is of surface hoar stuck onto the snow above it (called the upper block) and flipped over. The upper block is the 6" of denser new snow, and rather hard to flip over because it's so soft. So in the snow pit wall, these surface hoar crystals would be hanging down - imagine the photo upside down. Flipping the top block over when you get a shear on potentially buried surface hoar is a good way to look for buried surface hoar.

Lower photo is buried surface hoar pieces on a crystal card, a few pointed out with arrows.

Poor visibility - first photo: "find my partner". Second photo: "who wants first tracks into the ping pong ball..."

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