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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
Trigger
Trigger:
natural
Terrain
Aspect:
East
Starting Elevation:
near-treeline
Size
Destructive Size:
D1 Relatively harmless to people.
Relative Size:
R1 Very Small
Avalanche Length (Vertical Run):
200ft.
Avalanche Location:
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