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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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December 20, 2017 at 2:50 am

Avalanche danger is MODERATE near and above treeline due to wind slabs forming on leeward aspects greater than 35 degrees. Moderate means human triggered avalanches are possible and natural avalanches are unlikely. If riding in the backcountry today, watch out for rocks hidden below the new snow. Avalanche danger below treeline is LOW.

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December 19, 2017 at 7:00 am

LOW avalanche danger continues throughout the advisory area today. The National Weather Service has issued a WINTER WEATHER ADVISORY IN EFFECT FROM 1PM THIS AFTERNOON TO 7AM WEDNESDAY. The avalanche danger will rise overnight. Wind slabs are expected to form near and above treeline by tomorrow.   

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December 18, 2017 at 6:55 am

LOW avalanche danger continues throughout the advisory area. Firm and icy snow surfaces are widespread, and climbers should exercise caution in alpine terrain on Mount Shasta. The National Weather Service has issued a winter storm watch in effect Tuesday afternoon through Wednesday morning.

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December 17, 2017 at 6:51 am

LOW avalanche danger exists throughout the advisory area and will continue until a significant precipitation event occurs. Early season hazards associated with our shallow snowpack are still problematic. Climbers should exercise caution in alpine terrain on Mount Shasta where firm and icy snow surfaces are widespread.  

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December 16, 2017 at 6:31 am

LOW avalanche danger remains for all elevations and aspects. Gale force winds out of the north will preside near and above treeline on Mt Shasta today.  

Other notable hazards for the backcountry include: 

*firm, icy snow surfaces making self-arrest difficult

*numerous exposed and barely covered obstacles.  

*rime ice / rockfall 

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December 15, 2017 at 6:42 am

LOW avalanche danger remains for all elevations and aspects.

Notable hazards for the Mt Shasta backcountry today include: 

*increasing northwest winds near and above treeline.

*firm, icy snow surfaces making self-arrest difficult

*numerous exposed and barely covered obstacles.  

*rime ice / rockfall 

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December 14, 2017 at 6:20 am

LOW avalanche danger exists at all elevations. Natural and human triggered avalanches are unlikely. Exercise normal caution when traveling in the backcountry. Smooth and firm snow surfaces exist and a slide for life could occur in the event of a fall. Keep an eye out for falling rime ice. Wear a helmet, carry an ice axe and crampons, know how to use them.

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December 13, 2017 at 6:20 am

LOW avalanche danger exists in all elevation bands. Natural and human triggered avalanches are unlikely. Exercise normal caution when traveling in the advisory area. Smooth and firm snow surfaces exist and a slide for life could occur in the event of a fall. Bring the proper equipment and know how to use it. Keep an eye out for falling rime ice.

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December 12, 2017 at 6:21 am

Triggering an avalanche is unlikely, and LOW avalanche danger exists throughout the advisory area. In terrain 7,000ft and higher on Mount Shasta, backcountry travelers will encounter a firm, icy, and thin snowpack. Watch out for shallowly buried objects. A slide for life could easily occur in these conditions.

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December 11, 2017 at 6:40 am

LOW avalanche danger exists throughout the advisory area. Natural and human triggered avalanches are unlikely. Normal caution is advised. Very firm and icy snow surfaces can be found above treeline on Mount Shasta. Arresting a fall in these conditions could be difficult.

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December 10, 2017 at 6:52 am

The avalanche danger is LOW at all elevations and on all aspects today. Both human triggered and natural avalanches are unlikely.  Small wind slabs may exist in leeward terrain 10,000ft and higher on Mount Shasta. Very firm and icy snow surfaces can be found on the upper mountain as well. Arresting a fall in these conditions could be difficult.   

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December 9, 2017 at 6:09 am

The avalanche danger is LOW at all elevations and aspects today. Use extra caution when traveling in exposed, steep terrain with high consequences where typically small and benign avalanches pose a significant hazard. Also, watch out for sudden patches of icy snow surfaces on the upper mountain. Self arrest could be difficult.

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December 8, 2017 at 5:57 am

The avalanche danger is LOW at all elevations and aspects today. Extra caution is warranted when traveling in exposed, steep terrain with high consequences where typically small and benign avalanches pose a significant hazard. 

Watch out for sudden patches of icy snow surfaces on the upper mountain. Self arrest could be difficult and a slide for life possible.

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December 7, 2017 at 6:30 am

Today, Mt Shasta hosts low avalanche danger. Normal caution is advised. Watch out for sudden patches of icy snow surfaces. Self arrest could be difficult and a slide for life possible. Isolated small, hard wind slabs exist near and above treeline and will be difficult to trigger.

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December 6, 2017 at 6:45 am

The avalanche danger is LOW at all elevations throughout the advisory area. Natural and human triggered avalanches are unlikely. Exercise NORMAL CAUTION when traveling in the backcountry. Small wind slabs are unlikely to be seen, but could still linger in some alpine areas unaffected by the current warming trend.

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December 5, 2017 at 7:00 am

The avalanche danger is LOW at all elevations throughout the advisory area. Small wind slabs may exist in isolated areas above treeline on Mount Shasta. Natural and human triggered avalanches are unlikely. Be sure to monitor changing snow surface conditions as temperatures rapidly warm up today.   

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December 4, 2017 at 6:57 am

Wind slabs 1-2ft thick exist on NE-E-SE-S-SW aspects near treeline and above treeline. The avalanche danger is MODERATE above treeline and LOW near and below treeline today. Natural avalanches are unlikely while human triggered avalanches remain possible.

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December 3, 2017 at 6:59 am

Shallow wind slabs have formed on NE-E-SE-S aspects near and above treeline on Mount Shasta. MODERATE avalanche danger exists above treeline, while the avalanche danger is LOW near and below treeline. Natural avalanches are unlikely, but small human triggered avalanches are possible on steep wind loaded slopes. Thin snow cover also poses a significant hazard for skiers and riders.  

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December 2, 2017 at 6:46 am

A winter weather advisory is in effect today. Southwest winds will dominate along with a couple inches of new snow. Low danger and normal caution is advised. Early season conditions rule. Large objects like rocks, trees and shrubs can be seen easily, other small hazards may lurk below new snow surfaces. Tread lightly. 

Extremely icy conditions will be encountered on Mt Shasta above 8,000 feet. Be prepared. A climb of Mt Shasta with these conditions brings increased difficulty and consequences.

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December 1, 2017 at 6:45 am

LOW Danger and Normal Caution is advised for the Mt Shasta area backcountry. Early season conditions prevail with our barely usable snowpack above 6,500 feet. Watch for rocks, trees and other objects sticking above the snow surface.

Extremely firm and icy conditions will be encountered on Mt Shasta above 8,000 feet. Self-arrest is nearly impossible, even on low angle slopes. Be prepared. A climb of Mt Shasta with these conditions brings increased difficulty and consequences.

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