Observation: Alta Periphery

Observation Date
4/17/2013
Observer Name
Greg Gagne
Region
Salt Lake
Location Name or Route
Upper LCC
Weather
Sky
Few
Wind Direction
North
Wind Speed
Moderate
Weather Comments
Pesky northerly winds with Moderate gusts along ridgelines. -13C at 8 am
Snow Characteristics
New Snow Depth
4"
New Snow Density
Low
Snow Surface Conditions
Powder
Wind Crust
Snow Characteristics Comments

Rather difficult to measure new snow amounts as it appears snow totals are very localized due to snow showers. Overall it seems about 10 cms (4") new overnight, with storm totals easily exceeding 30 cms (1'). Snow surface was very light density with stellars at the surface. There may be some faceting that occurred as well, but again it seems very aspect dependent. Some wind deposits along ridge lines with 1F/4F soft slabs that would crack easily.

Comments

Quick dawn patrol in upper LCC skiing into Silver Fork and then back out to Alta. It appears there was about 10 cms (4") new overnight with very light-density snow at the surface. Snow that looked more like a December storm, not something from April. The biggest difference I noted between Tuesday and Wednesday mornings was that there was no wind on Tuesday morning, yet the winds had picked up along the ridgelines by Wednesday morning, apparently blowing NE through NW. I was finding some sensitive wind pockets on leeward aspects primarily along upper elevation ridgelines.Thicknesses were mostly in the 15 cm (6") range, although some drifts were approaching 30 cms. Some fresh cornices on SE through SW aspects. I was expecting the snow to sluff easily, but ski cuts on steep aspects would only produce minor sluffing at best. Saw lots of fresh tracks throughout upper LCC this morning - nice to see that others are still thinking skiing as well. Mostly Low danger with Moderate hazard related to any recent wind loading. But wind drifts are easy to identify and quite manageable. If the sun comes out it's a totally different story.

Oh yes, the skiing is superb with soft snow on all aspects.