** IMPORTANT ANNOUNCEMENT **

As of March 30th, COAC has suspended backcountry avalanche advisories and pro observations until further notice.

On March 23rd, Governor Brown of Oregon issued Stay at Home orders for the public regarding the COVID-19 outbreak. The directives are clear in that “to the maximum extent possible, individuals stay at home or in their place of residence.” On March 27th the Deschutes National Forest issued a closure of all developed recreation sites including trailheads and snoparks. COAC is committed to supporting our community, local emergency services, and agency partners and because of this we felt it important to cease operations as we all work together to minimize the impacts and spread of COVID-19.   

This decision was not taken lightly. Aside from the need to maintain congruency with the Governors' orders, there are inherent risks with backcountry activities in alpine environments and it’s important to consider unnecessary exposure to COAC forecasters, first responders, and local medical staff in light of the current situation.

We look forward to getting back into the mountains and providing you all with the tools to recreate safely in the backcountry. Until then we thank you for your continued support and wish all our mountain community the best of health and wellness.

Skier triggered avalanche on east side cliffs of Tumalo

Location Name
East side cliffs of Tumalo Bowl
Region
Three Sisters Area
Name
CJ Svela
Email Address
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Position
Public
Date and time of avalanche (best estimate if unknown)
Red Flags
Recent avalanche activity
Recent loading by new snow, wind, or rain
Obvious avalanche path
Terrain Trap
Avalanche Type
Slab
Blowing Snow
Yes
Trigger type
Skier
Wind Speed
Moderate
Slope
38degrees
Wind Direction
Northwest
Air temperature
Below Freezing
Aspect
East
Air temperature trend
Cooling
Elevation
6825ft.
Bed Surface
Storm Snow
Cloud Cover
100% of the sky covered by clouds
Precipitation
Snow
Weak Layer
Old Snow
Crown Height
2 ft
Accumulation rate
<1
Avalanche Width
400ft.
Avalanche Length
500ft.
Terrain
Near Treeline
Number of people caught
1
Number of partial burials
0
Number of full burials
0
More detailed information about the avalanche

 CJ Svela-, Nick Hall, Jacob Holcombe; skier triggered avalanche on the East Side cliffs of the Tumalo bowl. Good example of a a perfect 38degree (the sweet spot), lee side w/ lots of new snow and wind loading just below the cliffs, aka, trigger point. First skier initiated the fracture and propagation and second skier initiated the total release of the slab. Crown of the slab was 47cm. Flank-flank was approx 500' wide. Top to noticeable staunchwall was approx 350'. Runnout/path into trees/terrain trap was approx 500'-600' long. We knew the potential for this particular area to slide and demonstrated due diligence in setting off this particular slide path. This was a good exercise to learning how to notice terrain features for initiation or trigger points and recognizing terrain traps.