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Archived Avalanche Advisories from the Mount Shasta Avalanche Center

Use this page to view archived advisories. The table below shows the overall danger rating and the bottom line for the 20 most recent advisories. Click on the time and date link above each danger rating icon to view the full advisory for that day. Use the date chooser or the pager at the bottom to scroll through the older advisories.

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Date the advisory was published: Bottom Line
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March 31, 2016 at 6:25 am

This morning, LOW avalanche danger will prevail for all elevations and aspects. As daytime warming occurs, MODERATE danger is likely for loose-wet related instabilities on sunny slopes. Aspects east, southeast, south and southwest below 10,000 feet will host the best chance for human triggered loose-wet rollerballs, pinwheels and perhaps a larger point release loose wet slide. Calm winds and warm temperatures will persist through the week. ​

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March 30, 2016 at 7:01 am

LOW avalanche danger exists for all elevations and aspects throughout the forecast area.
Remember, LOW danger is not a green light... Small avalanches in isolated areas or extreme terrain are possible.
Continue to evaluate snow and terrain carefully looking for unstable snow on isolated terrain features. 

 
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March 29, 2016 at 6:29 am

LOW avalanche danger exists for all elevations and aspects throughout the forecast area.  Warming temperatures and sun may produce some loose wet snow instabilities near and below treeline.  Cooling north winds may limit distribution, however.  Danger for loose wet avalanches will increase tomorrow. Southerly aspects, slopes 37 degrees and steeper will be most suspect in the afternoon. Watch for clues like roller balls and pinwheel activity. Evaluate snow and terrain carefully looking for unstable snow on isolated terrain features. 

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March 28, 2016 at 6:19 am

LOW avalanche danger exists for all elevations and aspects across the forecast area.  Sun shine and warm temperatures have helped wind slabs continue to bond with underlying snow, and are becoming less sensitive to trigger.  Above treeline, in the typical starting zones, on slopes 37 degrees and steeper will be where one might find lingering slabs. Cold temperatures today will limit any loose wet instabilities. Evaluate snow and terrain carefully looking for unstable snow on isolated terrain features. 

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March 27, 2016 at 6:47 am

LOW avalanche danger exists for all elevations and aspects.  Warm temperatures helped wind slabs continue to bond with underlying snow, and are becoming less sensitive to trigger.  Some may remain above treeline at the tops of bowls, ridgelines, near rock outcroppings, and in steep chutes.  They will be most sensitive on slopes 37 degrees and steeper. Cooling temperatures will prevent any loose wet instabilities. Evaluate snow and terrain carefully, and look for unstable snow on isolated terrain features. 

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March 26, 2016 at 7:01 am

The strong northwest flow aloft continued yesterday.  This created some small to medium sized wind slabs/pillows in isolated areas near and above treeline.  MODERATE avalanche danger exist for these wind loaded pockets on SW-S-SE-E-NE facing slopes.  Human trigger of lingering wind slabs along the tops of bowls, ridgelines, near rock outcroppings, and steep chutes may be possible. LOW avalanche danger exist below treeline. Evaluate snow and terrain carefully. 

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March 25, 2016 at 7:01 am

Over the past 48 hours, strong northwest flow aloft has created pockets of unstable snow near and above treeline. Human triggered wind slabs along ridgelines, bowls, near rock outcroppings and steep chutes are possible. MODERATE avalanche danger with isolated areas of CONSIDERABLE danger exist for these wind loaded pockets on SW-S-SE-E-NE facing slopes. Later in the day, MODERATE danger is possible for loose-wet related instabilities on south and east aspects, below and near treeline.

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March 24, 2016 at 6:57 am

For most slopes in the forecast area, LOW avalanche danger will exist. 
Near and above treeline, strong northwest flow aloft has created new wind slabs in the past 24 hours and will continue today. Human triggered wind slabs along ridgelines, bowls, near rock outcroppings and steep chutes are possible and MODERATE avalanche danger exists for these wind loaded pockets. Small/medium size avalanches are possible and most likely to be found on SW-S-SE-E-NE facing slopes. Identify wind loading, proceed cautiously.

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March 23, 2016 at 7:08 am

MODERATE avalanche danger overall, with areas of CONSIDERABLE danger, exist near and above treeline today for wind slab avalanches. Recent new snow and wind blowing from both the N/NW and S/SW has loaded leeward terrain near ridgetops and bowls. A human triggered avalanche is possible today, and likely in wind loaded, steep terrain. You need to be able to identify wind loaded terrain and take appropriate action to avoid triggering an avalanche.

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March 22, 2016 at 7:01 am

MODERATE avalanche danger exists on all aspects and elevaitons, slopes 35 degrees and steeper for newly formed storm and wind slabs.  Storm slabs will be most prevalent near and below treeline in wind protected areas. Pockets of CONSIDERABLE danger remain on wind loaded, leeward NW-N-NE-E-SE aspects near and above treeline.  Human trigger of wind slabs may be possible. Evaluate the snowpack and terrain careully before committing to a slope. Conservative decision making is essential.
 

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March 21, 2016 at 7:02 am

Overall, MODERATE avalanche danger exists on all aspects and elevaitons, slopes 35 degrees and steeper for newly forming storm and wind slabs.  Storm slabs will be most prevalent near and below treeline as strong southerly winds limit development above. Pockets of CONSIDERABLE danger may develop on wind loaded, leeward NW-N-NE-E-SE aspects near and above treeline.  Human trigger of said problems is possible. Careful snowpack and terrain evaluation necessary.  Conservative decision making advised.
 

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March 20, 2016 at 6:59 am

Overall, LOW avalanche danger exists for all elevations and aspects this morning and will prevail below treeline all day.
Late in the day, high snow levels will create new wind and storm slabs near and above treeline and MODERATE with pockets of CONSIDERABLE danger are possible on wind loaded, leeward NW-N-NE-E facing slopes.
Expect windy southwesterly flow, ample precipitation (.7" today) and snow levels >7,000 feet to cause the avalanche danger to rise over the next several days. Use caution!

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March 19, 2016 at 6:14 am

Overall, LOW avalanche danger exists through out the forecast area for all elevations and aspects.
Temperatures will remain above normal today. Increasing clouds, and light to moderate southerly winds will make formation of any loose wet snow instabilities unlikely. Avalanche danger will begin to increase Sunday into Monday with back to back storms in the forecast. 
 For today, normal caution advised. Watch for unstable snow on isolated steep terrain features.

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March 18, 2016 at 6:27 am

Overall, LOW avalanche danger will be found in the forecast area today for most elevations and aspects.
As daytime warming occurs, expect pockets of MODERATE danger on E-SE-S-SW aspects, below and near treeline, due to wet-loose instabilities. While likely inconsequential today, loose-wet instabilities such as roller balls and point release style slides have the ability to entrench more snow as they move downhill and become potentially large. 
Normal caution advised.

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March 17, 2016 at 7:02 am

Overall, LOW avalanche danger will be found in the forecast area today. As daytime warming occurs, expect pockets of MODERATE danger on E-SE-S-SW-W aspects, all elevations, due to wet-loose instabilities.

Lingering pockets of MODERATE danger for a human triggered wind slab is possible on steep W-NW-N-NE-E facing slopes, near and above treeline.

As always, continue to use safe travel practices and evaluate slopes carefully before committing.

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March 16, 2016 at 6:56 am

MODERATE avalanche danger exists near and above treeline for remaining wind slabs on W-NW-N-NE-E aspects. LOW danger will be found below treeline on all aspects.  Human trigger of lingering wind slabs may be possible on slopes 37 degrees and steeper. Loose wet snow instabilities may develop on southerly aspects during the warmest portions of the day. Continue to evaluate the snow carefully and identify features of concern. Use caution on steeper slopes.

 

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March 15, 2016 at 7:00 am

MODERATE avalanche danger exists near and above treeline for remaining wind slabs on W-NW-N-NE-E aspects. Some isolated storm slabs may remain at higher elevations. LOW danger will be found below treeline on all aspects.  Human trigger of lingering wind slabs may be possible on slopes 37 degrees and steeper. Loose wet snow instabilities may develop on southerly aspects, but are unlikely. Continue to evaluate the snow carefully and identify features of concern. Use caution on steeper slopes.

 

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March 14, 2016 at 7:00 am

CONSIDERABLE avalanche danger exists near and above treeline. Pockets of HIGH danger are possible on W-NW-N-NE-E-SE slopes above treeline. Storm snow yesterday continued to build new storm and wind slabs.  Natural trigger of said slabs will be possible, and human trigger will be likely today. MODERATE danger exists below treeline. Be very cautious on or near slopes 35 degrees and steeper. Careful snowpack evaluation and route finding will be essential.

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March 13, 2016 at 7:08 am

Today, expect overall CONSIDERABLE danger for all avalanche terrain below, near and above treeline. Pockets of HIGH danger are possible on W-NW-N-NE-E-SE slopes near and above treeline. Storm snow since Saturday morning has created new storm and wind slabs that have been easily triggered. Remaining storm/wind slabs that did not slide yesterday could reach there tipping point today with additional new snow and wind loading. Use extreme caution on or near avalanche prone slopes.

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March 12, 2016 at 7:06 am

A winter storm warning is in effect - 10am today to 5am Monday. Moderate to high south wind and rapid accumulation of snow expected. Up to 2.75" snow/water equivalent by 3/14.
Today, the avalanche danger will begin at MODERATE for all elevations and aspects, but will rise to CONSIDERABLE with pockets of HIGH danger late in the day. Heavy precipitation will quickly build wind and storm slabs. Use extreme caution during these series of storms this weekend. 

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