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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. Please send us your observations using the buttons below.

Location Region Observation Typesort descending Date and time of observation or avalanche occurrence Videos Avalanche photos Videos Snowpack photos Snowpit or crown profile photo or graph Observation made by
Right Peak Castle Lake Avalanche Observation 03/04/2017 - 7:00pm Board of Directors
Powder Bowl Mt. Shasta Avalanche Observation 12/29/2016 - 7:00pm Public
Human triggered storm slab on Gray Butte Mt. Shasta Avalanche Observation 02/18/2017 - 9:20pm Forecaster
Old Ski Bowl Mt. Shasta Avalanche Observation 01/27/2018 - 11:00am Forecaster
Sun Bowl Mt. Shasta Avalanche Observation 02/28/2017 - 4:00pm Professional Observer
Middle Peak, Castle Lake Avalanche Observation 04/13/2017 - 10:30pm Professional Observer
Wind Slab Avalanche off Green Butte Mt. Shasta Avalanche Observation 01/25/2018 (All day) Forecaster
Green Butte, Sun Bowl Mt. Shasta Avalanche Observation 12/18/2016 (All day) Forecaster
Castle Lake area Castle Lake Avalanche Observation 01/03/2017 - 8:00pm Forecaster
Natural Avalanches in Sun Bowl Mt. Shasta Avalanche Observation 12/03/2017 - 2:00pm Forecaster
Gray Butte Mt. Shasta Avalanche Observation 03/24/2018 - 7:30pm Public
Green Butte Mt. Shasta Avalanche Observation 11/22/2016 - 7:00pm Forecaster
Ash Creek Butte East of Mt Shasta Avalanche Observation 02/20/2017 - 7:00pm Forecaster
Avalanche Gulch Mt. Shasta Avalanche Observation 04/02/2017 - 5:05pm Public
Lassen Park- Diamond Peak and Emerald Sidehill Outside of the Forecast Area Avalanche Observation 12/24/2016 - 10:00am Public