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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
Deadfall Lakes/Mount Eddy Mt Eddy Snowpack Observation 04/01/2018 - 6:30am Lower Deadfall Meadows Halfway up to Deadfall Lake from the trailhead. One has to snowmobile to the trailhead at this point Deadfall snow survey site Looking back down the Deadfall/Trinity drainage Looking up at the upper Deadfall drainage Looking toward Mt Shasta The final push to the summit of Mt Eddy Forecaster
West Side: Mumbo Basin & Whalen Summit Castle Lake Snowpack Observation 03/29/2018 - 8:00pm Trinity Mountains Mumbo Basin snow survey Forecaster
Castle Lake Castle Lake Snowpack Observation 03/27/2018 - 9:00pm Middle Peak, Traveling on Lake Ice Not Recommended Middle Peak Up Close Middle Peak Up Close Left Peak Right Peak Professional Observer
Giddy Giddy and Anaconda Mt. Shasta Snowpack Observation 03/26/2018 - 9:00pm wind loading quickly filling in recent tracks above treeline Anaconda, WSW aspect, 8400 ft, HS 160cm, ECTN 25 down 60cm Forecaster
Shastarama, Red Butte Snowpack Observation 03/26/2018 - 7:00pm Wind Transporting SnowStrong Winds Transporting Snow N-NE Winds Transporting Snow Down Ridgelines 5-12 cm (2-5 in) of Ski Penetration Red Butte Solar Radiation Effecting Sun Exposed Aspects and Surfaces Deeper Dryer Snow on Northerly Aspects Professional Observer
Gray Butte Mt. Shasta Avalanche Observation 03/24/2018 - 7:30pm Public
Mount Bailey Outside of the Forecast Area Avalanche Observation 03/24/2018 - 4:00pm Public
Gray Butte Mt. Shasta Snowpack Observation 03/23/2018 - 11:30pm minor cracking in storm snow surfaces, near treeline Gray Butte, poor visibility 4-6 inches of new, low density snow at 1630 hours at 8,000 ft. Old snow surface firm A poor picture of an easily triggered loose dry sluff Forecaster
Skies clear for the afternoon on Mt Shasta Mt. Shasta Snowpack Observation 03/22/2018 - 8:30pm Wind - 3.22.18 Below treeline rain runnels Below treeline rain runnels Near treeline, a look over at Gray Butte Above treeline, Green Butte Above treeline, looking south from 9,000 feet Above treeline, looking up at the upper mountain Forecaster
Rainbow Mountain, NE of Ash Creek Butte East of Mt Shasta Snowpack Observation 03/18/2018 - 10:00pm Test Profile, 6200 ft, North Facing, 32 Degree Slope Rainbow Mountain Professional Observer
Powder Bowl Mt. Shasta Snowpack Observation 03/17/2018 - 8:30pm Forecaster
Mount Shasta and Gray Butte Mt. Shasta Snowpack Observation 03/16/2018 - 11:30pm Gray Butte Gray Butte Forecaster
Old Ski Bowl, Grey Butte Mt. Shasta Snowpack Observation 03/14/2018 - 9:00pm Old Ski Bowl Old Ski Bowl Grey Butte Professional Observer
Castle Lake area still struggling... Castle Lake Snowpack Observation 03/14/2018 - 8:30pm Castle Weather Station Castle overview Forecaster
Old Ski Bowl, Bunny Flat Mt. Shasta Snowpack Observation 03/13/2018 - 9:00pm Conditions at Bunny Flat @ 1 PM Bunny Flat Trailhead @ 3 PM Whiteout Conditions above Treeline Test Profile Professional Observer