fbpx Diamond Lake Area Observations | Central Oregon Avalanche Center (COAC)
Intense precipitation
Rapid temperature rise
Observation Date/Time:
Sun, Feb 21, 2021 - 12:00 PM
Jared Broadwater
Diamond Lake Area (Baily, Crater Lake, Thielson) / 6000'
Report Type:
Snow Conditions  
Travel Mode:
Sky Conditions:
Obscured (eg: fog)
Precip Type/Intensity:
Snow / S2 Moderate snow
New Snow:
60 cm
Height of Snow (HS):
350 cm
Wind Direction/Speed:
SW / Light: 1-16 mph

Written Report:
Bluff east of Sherwood Butte.
Northern Aspect
6° incline
12:00 pm
Light snowfall

Several column test failures today. All sudden planar due to buried surface hoar. I dug a pit and performed a column test. The test consists of isolating a 30cm X 30cm column of snow. Then placing a shovel on top of the column and proceeding to strike the shovel with your hand. Beginning with 10 hits from the wrist. 10 hits from your elbow. Then 10 from the shoulder. CT stands for Column Test. The number reflects the number of total hits it failed on.

CT12 Sudden Planar @25cm.
CT18 Sudden Planar @50cm.
CT22 Sudden Planar @150cm.

GOOD NEWS!!! Our snowpack is healing. The 25 cm faceted layer that we had last week has been compressed to 10 cam and has moisture in it promoting bonding. I suspect this will be remedied completely by next weekend.

BOTTOM LINE: Ride conservatively in Avalanche Terrain. Ride with partners eyes on in these areas. Carry the gear. Use the training. Trees are beyond good right now. No need to expose yourself to unnecessary risk in the alpine. (My opinion). These tests show that the recipe for an avalanche is 100% there. And is likely in 30° or greater inclines. Does this mean you will cause an avalanche if you touch a slope 30° or more? No. But, it could mean it goes on the 10th time it’s touched, 30th time it’s touched, or even the 2nd time.