The last forecast for the 2022-2023 season was posted on April 30th. Thanks to everyone who supported the Sierra Avalanche Center this season by submitting observations, assisting with education, volunteering, and/or donating.

The last forecast for the 2022-2023 season was posted on April 30th. Thanks to everyone who supported the Sierra Avalanche Center this season by submitting observations, assisting with education, volunteering, and/or donating.
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October 27, 2012 at 21:23 pm |
Early season conditions update #2 We do not have enough information to issue regular avalanche advisories. We have started to collect data and will be sharing all of the information we gather on our observations page and in intermittent updates to this page. We plan to resume daily avalanche advisories in November as conditions dictate. |
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The snow from the recent storm continues to settle and melt. In some places it still provides supportable coverage; however, many barely hidden rocks, stumps, logs, and other bone-jarring, equipment-breaking obstacles lurk just under the surface. With careful route finding early season can provide fun recreation, but those obstacles and a shallow snowpack also make it more serious even when the avalanche danger decreases.
Earlier this week observations showed that the wind slabs that formed on wind loaded slopes both near treeline and above treeline did fail naturally and in response to human triggers. Observations over the last few days have shown a more stable and "right-side up" (lighter snow on top of more dense snow) snowpack in most places. As the snowpack continues to settle, consolidate, and melt the avalanche concerns should continue to diminish.
The forecast calls for another small storm to reach the region by mid week. The additional snow and wind associated with this storm could create new instabilities including storm slabs and wind slabs. These slabs will form on top of a snowpack that has covered some of the anchors that typically hold early season snow in place. Expect to see avalanche issues increase as this next storm impacts the area.
When traveling in the backcountry continue to make constant observations and look for indications of current or recent snowpack instability. The best indicator is recent avalanche activity. Wind loading, collapse, audible whumpfing sounds, shooting cracks, and/or test slope failure also represent excellent indications that an unstable snowpack exists in the immediate area. Once an unstable snowpack has formed, the only additional ingredients to create an avalanche are a slope steeper than 30 degrees and a trigger.
If you plan to embark on some early season adventures in or near avalanche terrain, each person should travel with avalanche rescue equipment including a transceiver, probe, and shovel with which they are well practiced. Allow only one person at a time to travel on slopes that are steeper than 30 degrees. Also remember those many hazards such as rocks, down trees, and stumps that lie hidden just beneath the snow surface. An injury at this time of year can make for a very long winter. Some great ways to enjoy the early season snow include practice rescue skills and beacon searching while out touring on snow covered forest roads or making turns on a slope where you know the snow is sitting on top of a soft grassy meadow.
Check out the avalanche tutorials specifically designed for skiers and snowmobilers at the Forest Service National Avalanche Center web site.
Current remote weather station data from the NWS can be found by clicking here. A general weather forecast for the area can be found by clicking here.
Please note: If you are intending to travel within the boundaries of a ski area that is not yet open for the season, no avalanche mitigation measures exist at this time. Please treat any closed ski area as the backcountry terrain and snowpack that it currently is. Respect any closure signs that may be in place at the parking lot or base area. Carry proper backcountry equipment and avalanche rescue equipment. Expose only one person at a time to avalanche terrain (which is often widespread and complex within a ski area). Do not traverse above others. Things may look the same and seem very familiar to an operating ski area, but from a safety standpoint, right now the avalanche risk is significantly higher.
Early season conditions update #2
We do not have enough information to issue regular avalanche advisories. We have started to collect data and will be sharing all of the information we gather on our observations page and in intermittent updates to this page. We plan to resume daily avalanche advisories in November as conditions dictate.
0600 temperature: | deg. F. |
Max. temperature in the last 24 hours: | deg. F. |
Average wind direction during the last 24 hours: | |
Average wind speed during the last 24 hours: | mph |
Maximum wind gust in the last 24 hours: | mph |
New snowfall in the last 24 hours: | O inches |
Total snow depth: | inches |
For 7000-8000 ft: |
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Weather: | |||
Temperatures: | deg. F. | deg. F. | deg. F. |
Wind direction: | |||
Wind speed: | |||
Expected snowfall: | O in. | O in. | O in. |
For 8000-9000 ft: |
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Saturday: | Saturday Night: | Sunday: | |
Weather: | |||
Temperatures: | deg. F. | deg. F. | deg. F. |
Wind direction: | |||
Wind speed: | |||
Expected snowfall: | O in. | O in. | O in. |
This website is owned and maintained by the non-profit arm of the Sierra Avalanche Center. Some of the content is updated by the USDA avalanche forecasters including the forecasts and some observational data. The USDA is not responsible for any advertising, fund-raising events/information, or sponsorship information, or other content not related to the forecasts and the data pertaining to the forecasts.