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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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April 12, 2017 at 6:28 am

Avalanche danger is expected to rise to CONSIDERABLE throughout the day due to the continued growth of wind slabs. Stay clear of wind loaded aspects greater than 35 degrees. Wind slabs will be most prevalent on NW-N-NE aspects, but mountain winds can be unpredictable so pay attention near all steep terrain. Avalanche danger is MODERATE below treeline due to the potential of a storm slab problem.

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April 11, 2017 at 6:43 am

The avalanche danger is MODERATE near and above treeline. A potent winter storm will begin today bringing snowfall, gale force winds, and unseasonably cold temperatures. Wind slabs are the primary avalanche concern. Southerly winds continue to form wind slabs on W-NW-N-NE-E-SE aspects near and above treeline. Be sure to monitor conditions as they change, and anticipate increasing avalanche danger as the storm progresses over the next 24-48 hours. The avalanche danger is LOW below treeline.

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April 10, 2017 at 6:51 am

The avalanche danger is MODERATE near and above treeline. Human triggered wind slab avalanches are possible. New snow and southwesterly winds continue to form shallow wind slabs on NW-N-NE-E-SE aspects near and above treeline. Natural avalanches are unlikely. LOW avalanche danger exists below treeline.

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April 9, 2017 at 6:32 am

Avalanche danger is MODERATE near and above treeline. MODERATE means natural avalanches are unlikely and human triggered avalanches are possible. Unlikely does not mean impossible so evaluate the snowpack when traveling on or near slopes greater than 35 degrees. Avalanche danger below treeline is LOW.

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April 8, 2017 at 6:56 am

CONSIDERABLE avalanche danger exists above treeline and near treeline. Wind slab avalanches are the primary concern.  Natural avalanches are possible and human triggered avalanches are likely on wind loaded slopes 35 degrees and steeper. The avalanche danger is MODERATE below treeline. A storm slab avalanche problem is an additional concern today as the snowpack adjusts to the weight of the recent snow.

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April 7, 2017 at 6:33 am

Avalanche danger near and above treeline is HIGH. HIGH means natural and human triggered avalanches are likely. The primary concern is wind slabs on leeward facing slopes. A secondary concern is storm slabs below treeline. Traveling on or near slopes greater than 30 degrees is not recommended. Avalanche danger below treeline is MODERATE.

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April 6, 2017 at 6:42 am

Avalanche danger will increase throughout the day to CONSIDERABLE near and above treeline as new snow combines with moderate to strong winds to form wind slabs. Evaluate changing conditions throughout the day. Avoid slopes greater than 30 degrees where wind loading is occurring. Avalanche danger below treeline is MODERATE.

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April 5, 2017 at 6:13 am

Overall avalanche danger today is LOW at all elevations. NORMAL CAUTION is advised. Expect high winds in the alpine region. Falling rime ice continues to be the primary concern for skiers and climbers venturing above treeline on Mount Shasta. A winter storm starting late tomorrow will bring up to 3 inches of water and possibly 2 feet or more of snow above 4400'.

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April 4, 2017 at 6:54 am

Falling rime ice continues to be the primary concern for skiers and climbers venturing into high alpine terrain on Mount Shasta. Natural and human triggered avalanches are unlikely, and the avalanche danger is LOW at all elevations. NORMAL CAUTION is advised. A potent storm is set to begin on Thursday.  Expect a return to winter conditions in the backcountry by the weekend.

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April 3, 2017 at 6:31 am

Natural and human triggered avalanches are unlikely, and the avalanche danger is LOW at all elevations. LOW danger does not mean the backcountry is free of hazard, and NORMAL CAUTION is advised. As it warms up throughout the day, watch for isolated wet loose avalanches on steep sun exposed slopes, and for falling rime ice at upper elevations on Mount Shasta.

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April 2, 2017 at 6:44 am

The avalanche danger is LOW at all elevations, and natural and human triggered avalanches are unlikely. Generally safe avalanche conditions exist, and NORMAL CAUTION is advised. As it warms up throughout the day, be sure to watch for falling rime ice in alpine terrain on Mount Shasta, and for loose wet avalanches on sun exposed slopes 35 degrees and steeper.

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April 1, 2017 at 6:43 am

LOW avalanche danger exists at all elevations, and Normal Caution is advised. Extreme northerly winds have scoured most snow surfaces over the past 48 hours, and strong north winds will continue today above 10000ft. Warm temperatures and intense solar radiation will create a significant falling rime ice hazard in the alpine on Mount Shasta.  Also, watch for isolated wet loose avalanches on steep sun exposed slopes as it warms up throughout the day.

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March 31, 2017 at 6:30 am

Avalanche danger near and above treeline is MODERATE due to the formation of new wind slabs.  Near treeline, expect wind slabs on east and southeast aspects. Above treeline, slabs may exist on all aspects. Slopes greater than 35 degrees are most prone to avalanche. Below treeline, avalanche danger is LOW.

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March 30, 2017 at 6:30 am

Avalanche danger above treeline is MODERATE due to the potential for wind slab avalanches. Wind slabs may exist on all aspects above 9000' and are a concern on slopes greater than 35 degrees. Near and below treeline, avalanche danger is LOW.

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March 29, 2017 at 6:45 am

Avalanche danger above treeline is MODERATE due to the existence of wind slabs. Near treeline avalanche danger is LOW overall though isolated areas of MODERATE danger could exist on leeward slopes greater than 35 degrees. Cornice falls and wet loose avalanches are a secondary concern below 8500'.  Below treeline, avalanche danger is LOW.

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March 28, 2017 at 6:33 am

Near and above treeline, MODERATE avalanche danger exists.  Strong and variable winds have created fresh wind slabs in leeward terrain, primarily on Mount Shasta between 9,000-12,000ft on easterly aspects.  Natural avalanches are unlikely, while human triggered avalanches remain possible. Below treeline, the avalanche danger is LOW.   

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March 27, 2017 at 6:50 am

The avalanche danger is MODERATE near treeline and above treeline.  Wind slabs exist in leeward terrain, primarily on S-SE-E-NE-N aspects. Precipitation will taper off by the early afternoon, but steady, westerly winds will continue. Watch for blowing snow and fresh wind slab development throughout the day. The avalanche danger is LOW below treeline.      

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March 26, 2017 at 6:06 am

LOW danger this morning will rise to MODERATE with brief windows of CONSIDERABLE avalanche danger today. New wind slabs are possible near and above treeline due to gusty west/southwest winds and fresh snow. Pay attention to areas where blowing snow is observed. Evaluate the snow carefully and identify features of concern.

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March 25, 2017 at 6:21 am

Above 6,500 feet, a foot of new snow over the past 36 hours accompanied by strong westerly winds has contributed to several avalanche problems for today. Human triggered avalanches are possible. Expect overall MODERATE avalanche danger for most aspects and elevations with CONSIDERABLE danger on leeward, NE-E-SE aspects above treeline. Slopes greater than 35 degrees should be approached with caution. Be able to make solid snow observations and don't ignore obvious signs of avalanche danger!

 

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March 24, 2017 at 6:37 am

Wind slab avalanches will be likely for human trigger today above treeline due to new snow and windy conditions. Expect CONSIDERABLE danger above treeline in exposed areas, along ridgelines and near the edges of open bowls. Some isolated, exposed areas near treeline could experience CONSIDERABLE danger as well, however near treeline MODERATE danger will prevail overall. Below treeline, avalanche danger is LOW. 

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