Buried Surface Hoar Layer

Location Name: 
Goose Lake Road near Goose Lake
Region: 
Goose Lake Area
Date and time of observation: 
Thu, 01/19/2017 - 14:30
Location Map: 
United States
45° 3' 3.9204" N, 116° 8' 57.966" W
US


Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain
Rapid warming

Observation made by: Forecaster
Snowpit Observations
More detailed information about the snowpack: 

12-20 inches of snow is now covering up a layer of Buried Surface Hoar and faceted snow.  Many natural avalanches occurred in the last 24 hours on this layer, however many areas did not slide and are likely waiting for a human trigger. Overnight temperatures fell last night which will likely make the overlying slab more brittle.  This layer is likely to remain a problem until we have another significant weather event.   Snowpack photos show the thin grey line at the height of the saw blade that in a crown profile and the layer prior to the storm cycle.  The video shows the result of a Propagation Saw Test that failed at 15/100... a very good indicator that this layer has the ability to propagate easily and perhaps over large areas where this layer is present.

Snowpit or crown profile photo or graph: 
Snowpit videos (tests, etc): 
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Light
Precipitation: 
Snow
Air temperature trend: 
Cooling
Wind Direction: 
Southwest
Accumulation rate: 
Less than 1 in. per hour
More detailed information about the weather: 

A significant precipitation event was accompanied by warming temperatures(near or above freezing during storm), winds in the upper 20 to low 30 MPH range and intervals of grauple and freezing mist.