Sun and powder

Location Name: 
BNSF Avalanche Safety - Snowslip Mtn. GNP
Observation date: 
Monday, February 17, 2020 - 23:30

Is this an Avalanche Observation: 
Yes
Observation made by: Public

Tabs

Quick Observation
  • Toured up the SE ridge of Snowslip Mtn and above the Burnout, Shed 4D, and Shed 5 avalanche paths to our high point at 6400 feet at the Shed 7 weather station.
  • Descended the Shed 5 path. 

Objectives were to:

  • Perform welfare checks on the Shed 4 and Shed 7 weather stations.
  • Observe new snowfall totals and wind-loading from the past few days and look for any recent avalanche activity.
  • Conduct a full snowpit profile in the Shed 5 avalanche path.
  • A handful of very small (D1) loose dry sluffs on steep sun-exposed slopes.
  • Small cornice fall in the Shed 7 West path.
  • No slab avalanche activity observed.
  • No wind-loading occurring throughout the day but evidence of older wind slabs near ridgelines. Only some minor cracking in these with ski cuts.
  • 3-5 inches of new snow over the past 24 hours.
  • The 2/1 crust is now buried about 12 inches deep on the Canyon floor, about 20 inches deep at 5000 feet, and 2-4 feet deep above 6000 feet.
  • No collapsing or audible failures observed.
  • Full profile conducted in the upper starting zone of Shed 5, 5800 feet, E aspect, 37° slope. Total snowpack depth at profile location was 79” (pit profile below). 
  • Stability tests were limited to one Extended Column Test. Non-propagating results in the upper 20 inches. No fractures on the 2/1 crust and buried 30 inches down at the pit location.
  • Intense, but very brief snow showers at times (S2-S5) alternating with longer periods of broken skies and sunshine. Only a trace to 1 inch of new snowfall over the day.
  • Calm or sometimes light SW winds at all elevations.
  • Air temperatures in the mid to high-20s (0F) throughout the day.
Snowpack, Avalanche, Weather Images: 
Travel Details
Region: 
Flathead Range/Glacier National Park - John F. Stevens Canyon
Activity: 
Skiing
Avalanche Details
Avalanche Details: 
Date and Time of Avalanche: 
Monday, February 17, 2020 - 13:30
Number of avalanches: 
4
Avalanche Type: 
Loose Dry/ Sluff
Failure Plane/Weak Layer: 
Within storm snow
Hide Trigger
Trigger: 
natural
Hide Terrain
Aspect: 
East
Starting Elevation: 
near-treeline
Hide Size
Destructive Size: 
D1 Relatively harmless to people.
Relative Size: 
R1 Very Small
Avalanche Length (Vertical Run): 
200ft.
Avalanche Location: