Middle Middle

Location Name: 
Forecaster Observation - Middle Fork
Observation date: 
Monday, February 17, 2020 - 20:15

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

Tabs

Quick Observation

Day off ski taking advantage of snow conditions at mid-elevations in the middle fork.

  • Thin, spongy-feeling slabs of new and drifted snow at low and mid elevations. Some sitting on a recent crust. We tested these w skintracks across and up steep terrain and turns down steep terrain, both open and treed. All were unreactive where we traveled. 
  • Recent winds have had their way with the snow on exposed, mid elevation terrain, leaving some exposed terrain features scoured.
  • Lots of whale-like drifts on mid-elevation ridges from recent westerly winds, along with hard, overhanging cornices, We steered clear of these. 
  • The recent snow sluffed on steep pitches in wind sheltered terrain, though it ran on the snow surface.
  • From a distacne we saw what looked like recent debris in a large, east-facing chute at upper elevations above Rescue Creek. Other parties were closer and might have had a better view. 

We avoided steep start zones in leeward slopes, choosing instead to sneak in from the side.

Travel Details
Region: 
Flathead Range - Middle Fork Corridor
Route Description: 

3400-6100 ft

Activity: 
Skiing
Snowpack Details
Snowpack and Weather Details: 
Hide Terrain
Elevation of observation: 
3500-5000 ft
5000-6500 ft
Aspect(s) of observation: 
N
NE
NW
Persistent Weak Layers: 
Not observed
New Snow in the past 24 hours: 
3.00in.
More comments about the snowpack and weather: 
Skies alternated between broken and overcast, though peaks rarely obscured. Snow showers, the most intense of which was a mid afternoon convective pulse that puked graupel and snow at S5 for about 30 minutes. A few puffs of wind but otherwise dead calm. Snow dry to highway prior to mid-afternoon sunny period. DOn't know after that.
Blowing Snow: 
None
Wind Speed: 
Calm (No air motion)
Air temperature: 
Below Freezing
Snow line: 
2500'
Sky Cover: 
Mostly Cloudy (BRK)
Highest Precipitation Rate: 
Light Snowfall (S1)
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
More information or comments about the avalanche: 
Hide Trigger
Trigger: 
skier
Hide Terrain
Start Zone Slope Angle: 
40
Aspect: 
Northeast
Starting Elevation: 
near-treeline
Hide Size
Destructive Size: 
D1 Relatively harmless to people.
Relative Size: 
R1 Very Small
Avalanche Length (Vertical Run): 
70ft.
Avalanche Location: