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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 Type Date and time of observation or avalanche occurrencesort ascending Videos Avalanche photos Videos Snowpack photos Snowpit or crown profile photo or graph Observation made by
Grey Butte Mt. Shasta Snowpack Observation 12/24/2016 - 1:00pm Forecaster
East side of Coyote Butte Mt. Shasta Snowpack Observation 12/24/2016 - 8:45am Public
Lassen Park- Diamond Peak and Emerald Sidehill Outside of the Forecast Area Avalanche Observation 12/24/2016 - 2:00am Public
Giddy Giddy Gulch Mt. Shasta Snowpack Observation 12/23/2016 - 2:30pm Forecaster
Castle Lake Castle Lake Snowpack Observation 12/22/2016 - 4:30pm Forecaster
Green Butte, Sun Bowl Mt. Shasta Avalanche Observation 12/17/2016 - 4:00pm Forecaster
Casaval Ridge, Avalanche Gulch Mt. Shasta Avalanche Observation 12/17/2016 - 6:00am Large Natural Avalanche, Casaval Ridge into Avalanche Gulch Forecaster
Ash Creek Butte East Bowl East of Mt Shasta Snowpack Observation 12/16/2016 - 2:30pm Wind Transport Ash Creek Butte Ridge Weather Station Shooting Cracks, shallow wind slab pocket on test slope Forecaster
Lower Sunbowl Snowpack Observation 12/15/2016 - 2:30pm Professional Observer
East Powder Bowl area Mt. Shasta Snowpack Observation 12/15/2016 - 2:00pm Not the best lighting, but crown line of recent wind slabavalanche visible along ridgeline Forecaster
West Aspect, Green Butte Ridge, Treeline Mt. Shasta Snowpack Observation 12/14/2016 - 3:56pm Professional Observer
Treeline, road above bunny flat Mt. Shasta Snowpack Observation 12/14/2016 - 11:00am Public
NW Slope Left Peak Castle Lake Snowpack Observation 12/13/2016 - 1:15pm Forecaster
Old Ski Bowl Mt. Shasta Snowpack Observation 12/11/2016 - 3:00pm Strong NW winds continue to transport snow Forecaster
Old Ski Bowl Mt. Shasta Snowpack Observation 12/10/2016 - 3:30pm Mt Shasta, old ski bowl, 12.10.16 Old Ski Bowl Old Ski Bowl Old Ski Bowl Old Ski Bowl weather station Small wind slab natural off east aspect Green Butte Forecaster