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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 occurrence Videos Avalanche photos Videos Snowpack photos Snowpit or crown profile photo or graph Observation made bysort descending
Gray Butte Mt. Shasta Snowpack Observation 12/03/2016 - 9:30pm Gray Butte area Board of Directors
Right Peak Castle Lake Avalanche Observation 03/04/2017 - 7:00pm Board of Directors
Avalanche Gulch Mt. Shasta Snowpack Observation 12/05/2016 - 4:30pm Avalanche Gulch, 50/50 Flat area, icy sheen on snow! Windy, firm conditions Lower Avalanche Gulch Board of Directors
Avy Gulch/Casaval Ridge/The Catwalk/Trinity Chutes Mt. Shasta Snowpack Observation 12/30/2016 - 7:30am The Catwalk Trinity Chutes Riming Thumb Rock & Sargents Climbing Ranger
Old Ski Bowl Mt. Shasta Snowpack Observation 12/20/2017 - 9:30pm Forecaster
Castle Lake Castle Lake Snowpack Observation 03/07/2018 - 8:30pm Right Peak, Castle Lake Left Peak, Castle Lake Forecaster
Avalanche Gulch Mt. Shasta Snowpack Observation 01/19/2018 - 7:00pm Looking up Avalanche Gulch From Lake Helen Sargent's Ridge Forecaster
West Side: Mumbo Basin & Whalen Summit Castle Lake Snowpack Observation 03/29/2018 - 8:00pm Trinity Mountains Mumbo Basin snow survey Forecaster
Green Butte Ridge and Sun Bowl Mt. Shasta Snowpack Observation 02/01/2018 - 10:45pm Lower portion of Green Butte Ridge, below treeline, thin snowpack Texturing of snow surface Old wind slab avy debris, looking down into Sun Bowl from Broadway Broadway with Mount Shasta in background, near treeline Forecaster
Ash Creek Butte East Bowl East of Mt Shasta Snowpack Observation 12/05/2016 - 9:30pm A view of the east side of Mt Shasta on 12/5/16 Our new Ash Creek Butte weather station! Forecaster
Giddy Giddy Gulch Mt. Shasta Snowpack Observation 12/23/2016 - 10:30pm Forecaster
Old Ski Bowl Mt. Shasta Snowpack Observation 01/04/2018 - 9:00pm Bunny Flat trailhead on 1.4.18 at 1300 hrs About 1-2 inches new snow at 8900 feet, Old Ski Bowl on 1/4/18 Bare forest, just above Bunny Flat along road. This is the typical return for skiers skiing Sun Bowl/Powder bowl Everett Memorial Highway, just above Bunny Flat Forecaster
Powder Bowl Mt. Shasta Snowpack Observation 03/17/2018 - 8:30pm Forecaster
Above Treeline Snowpit & Conditions Mt. Shasta Snowpack Observation 01/26/2018 - 8:30pm Recent avalanche (estimated 1.24.18) Surface conditions, Old Ski Bowl, upper elevations Snowpit, 10,000 ft, Old Ski Bowl Scoured moraine tops, 9,500 feet Forecaster
Old Ski Bowl Mt. Shasta Snowpack Observation 02/17/2018 - 9:00pm Forecaster