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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 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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March 23, 2017 at 6:45 am

Avalanche danger is CONSIDERABLE above treeline, MODERATE near treeline, and LOW below treeline. Up to 17 inches of snow was received during the storms beginning on Monday afternoon. Above 8000' wind slabs exist and will continue to be loaded with blowing snow and new snow tonight. When venturing into terrain that is steeper than 30 degrees, pay attention. Avalanches are possible and likely on slopes covered with snow transported by the wind. 

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March 22, 2017 at 7:45 am

Avalanche danger is CONSIDERABLE near and above treeline.  With 11 inches of new snow and poor bonding between the new snow and an underlying crust, wind slabs on leeward slopes will be sensitive to human trigger. With 4 inches of additional snow today and continued wind transport, natural avalanches are possible. Watch out for sloughing snow as well. Though less likely, isolated slabs could be encountered below treeline on slopes greater than 35 degrees. Below treeline, avalanche danger is MODERATE.

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March 21, 2017 at 6:46 am

The avalanche danger is CONSIDERABLE above treeline and MODERATE near treeline.  New snow and strong southeast winds have allowed wind slabs to form in lee areas near and above treeline, with the most dangerous conditions in alpine terrain above 9000ft.  Snowfall will continue as freezing levels lower, and backcountry travelers should carefully evaluate changing conditions throughout the day.  LOW avalanche danger exists below treeline.     

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March 20, 2017 at 6:21 am

The avalanche danger is MODERATE on all aspects above treeline. Variable winds have redistributed the recent snow in the alpine, creating fresh wind slabs on lee slopes and terrain features, primarily above 9000ft. LOW avalanche danger exists near treeline and below treeline.

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March 19, 2017 at 6:39 am

MODERATE danger exists above treeline on all aspects.  New snow over the past 24 hours paired with strong and variable winds has formed fresh wind slabs in leeward terrain features, primarily above 9000ft.  The avalanche danger near treeline and below treeline is LOW.

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