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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
Castle Lake Castle Lake Snowpack Observation 12/24/2017 - 10:00pm Forecaster
Old Ski Bowl Mt. Shasta Snowpack Observation 12/24/2017 - 7:00pm Forecaster
Eastside photos East of Mt Shasta Snowpack Observation 12/22/2017 - 9:30pm Eastside panorama, Ash Creek Butte and Mt Shasta visible East Bowl, ACB ACB loop road view Forecaster
Green Butte Ridge Mt. Shasta Snowpack Observation 12/20/2017 - 10:00pm Lower Green Butte Ridge Small Isolated Soft Wind Slabs, Stubborn, No Propagation Near Treeline on Green Butte Ridge Avalanche Gulch Sun Bowl Professional Observer
Old Ski Bowl Mt. Shasta Snowpack Observation 12/20/2017 - 9:30pm Forecaster
Crater Lake National Park Outside of the Forecast Area Snowpack Observation 12/20/2017 - 7:00pm Forecaster
Old Ski Bowl, Grey Butte Mt. Shasta Snowpack Observation 12/18/2017 - 10:00pm 40-60cm of coverage on the NW aspect of Grey Butte Tree down on the Everett Memorial Highway on the way to the OSB Forecaster
Castle Lake Castle Lake Snowpack Observation 12/15/2017 - 10:30pm Forecaster
Upper mountain / Mud Creek Mt. Shasta Snowpack Observation 12/13/2017 - 2:15pm Public
Old Ski Bowl Mt. Shasta Snowpack Observation 12/11/2017 - 9:00pm Inversion Sun shiny snow Ski Bowl East Boundary Signs are Posted Professional Observer
Parks Creek Road and Mount Eddy Area Mt Eddy Snowpack Observation 12/11/2017 - 4:00pm Forecaster
Ash Creek Butte/East Side of Shasta East of Mt Shasta Snowpack Observation 12/09/2017 - 9:00pm Forecaster
Avalanche Gulch Mt. Shasta Snowpack Observation 12/08/2017 - 9:00pm Forecaster
Conditions on the East Side East of Mt Shasta Snowpack Observation 12/05/2017 - 7:00pm Surface Hoar Near Ash Creek Butte (~6000') Ash Creek Butte Road Conditions to Ash Creek Butte You May Get Stuck! Ash Creek Butte Road Conditions at Pilgrim Creek Snowmobile Park Clear Creek Road Conditions 5500' Easterly Aspects of Mt. Shasta Professional Observer
General Conditions Across Forecast Area Mt. Shasta Snowpack Observation 12/03/2017 - 8:00pm Castle Lake Upper Sand Flat Lower Sun Bowl Wind Scoured Ridges, Westerly Wind Loading Isolated Slabs Bunny Flat from Lower Green Butte Ridge Sastrugis on Lower Green Butte Ridge Professional Observer