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Snowpack, Weather, and Avalanche Observations

Please remember that these observations indicate what was going on in the snowpack at a single point in time and space. They may not represent conditions where you are or where you plan to be. They also come from a variety of sources. MSAC cannot vouch for the quality or accuracy of any observations that come from the general public. Some of these may be professional quality observations; some may not. Please use observations listed on this page as part of your information gathering process, but as always don't make decisions based on a single piece of information.

If you are looking for more information on how to understand the information on this page, all of the pit data graphs and stability tests are part of what is presented in a Level II avalanche class that follows the American Avalanche Association (AAA) or American Institute for Avalanche Research and Education (AIARE) curriculum guidelines. All of the coding and abbreviations for data presented follows the publication Snow, Weather, and Avalanches: Observational Guidelines for Avalanche Programs in the United States (SWAG) which is the standard for all professional avalanche programs in the US. An electronic copy is available here. Most of what you are looking for is in Chapter 2 and Appendix F part 1. We use a program called SnowPilot to create the snowpit graphs. This program is available as a free download at A video on how to download and use this program is available here.

Location Region Observation Type Date and time of observation or avalanche occurrence Videos Avalanche photos Videos Snowpack photos Snowpit or crown profile photo or graph Observation made by
Left Peak Castle Lake Castle Lake Snowpack Observation 01/11/2017 - 2:30pm Middle Peak Rain Runnels Skin Track Cornice CT7 Failure Bathrooms Professional Observer
Grey Butte NE Aspects Mt. Shasta Snowpack Observation 01/10/2017 - 3:00pm Windloading Human Triggered Avalanche - Location Professional Observer
Coyote Butte Mt. Shasta Snowpack Observation 01/09/2017 - 2:30pm Snowpack layers Professional Observer
Gerald's Bowl Mt. Shasta Snowpack Observation 01/09/2017 - 12:00pm Forecaster
Roadbank, Above Box Canyon Dam Mt. Shasta Avalanche Observation 01/08/2017 - 11:00am Forecaster
NE Aspect Grey Butte 7800' Mt. Shasta Snowpack Observation 01/04/2017 - 3:00pm Quick column test cut just below new/old snow interface. Professional Observer
Green Butte Ridge Mt. Shasta Snowpack Observation 01/03/2017 - 2:30pm Forecaster
Castle Lake area Castle Lake Avalanche Observation 01/03/2017 - 12:00pm Forecaster
Left peak Castle Lake Snowpack Observation 01/03/2017 - 12:00pm Public
Deadfall Lakes, Mount Eddy Mt Eddy Snowpack Observation 01/01/2017 - 1:30pm Mount Eddy 01.01.17 Snowpack Summary and ECT Forecaster
Avy Gulch/Casaval Ridge/The Catwalk/Trinity Chutes Mt. Shasta Snowpack Observation 12/29/2016 - 11:30pm The Catwalk Trinity Chutes Riming Thumb Rock & Sargents Climbing Ranger
Powder Bowl Mt. Shasta Avalanche Observation 12/29/2016 - 11:00am Public
North Side of Green Butte Mt. Shasta Snowpack Observation 12/28/2016 - 2:30pm Forecaster
Castle Lake Castle Lake Snowpack Observation 12/27/2016 - 12:00pm Professional Observer
Green Butte, Powder Bowl, Lower Sun Bowl Mt. Shasta Snowpack Observation 12/25/2016 - 12:30am Forecaster