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.

E.g., 07/24/2017
E.g., 07/24/2017
Date the advisory was published: Bottom Line
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January 7, 2017 at 7:06 am

CONSIDERABLE avalanche danger exists on all aspects and at all elevations.  A Winter Storm Warning is in effect until 10pm this evening, and the avalanche danger will increase as snow accumulates.  Wind slabs avalanches are the primary concern, and can be found near and above treeline on NW-N-NE-E-SE aspects.  Persistent slab avalanches on NW-N-NE-E aspects near and below treeline are a concern as well  Today, natural avalanches are possible, and human triggered-avalanches are likely.

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January 6, 2017 at 6:58 am

Today, MODERATE avalanche danger prevails for all aspects and elevations. The avalanche danger will gradually increase to CONSIDERABLE or HIGH danger tonight into tomorrow. A winter storm watch is in affect beginning this evening. Southwesterly winds will increase and abundant precipitation is in the forecast.  Persistent slab avalanches are unlikely today, but should be monitored as this wet winter storm will rapidly add weight to the snowpack. Human triggered wind slabs remain possible today.

 

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January 5, 2017 at 6:42 am

Wind slabs, storm slabs and persistent slabs continue to present a complex mix of avalanche problems today. Expect overall MODERATE danger for all elevations on W-SW-S-SE facing slopes. For NW-N-NE-E facing slopes, expect CONSIDERABLE danger on slopes steeper than 37 degrees.  Be especially cautious if traveling anywhere in the west side of the advisory area. Numerous signs of instability have been observed in the Castle Lake area recently. Continue to use cautious route finding and sound decision making skills!

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January 4, 2017 at 6:51 am

Wind slabs, storm slabs and persistent slabs present a complex mix of avalanche problems today. Dangerous avalanche conditions exist in the backcountry. Expect MODERATE danger below treeline and CONSIDERABLE to HIGH danger near and above treeline. Natural avalanche are likely in some areas. Human triggered avalanches are very likely. Stay off avalanche terrain and out of runout zones. Very careful snowpack evaluation, cautious route finding, and conservative decision-making are essential today.

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January 3, 2017 at 7:22 am

CONSIDERABLE avalanche danger exists on all aspects above treeline and near treeline.  MODERATE avalanche danger exists below treeline.  Wind Slabs avalanches near and above treeline on NW-N-NE-E-SE aspects are the primary concern.  Storm Slab avalanches are also a concern.  Natural avalanches are possible and human triggered avalanches are likely.  Dangerous avalanche conditions exist in the backcountry.  Careful snowpack evaluation, cautious route finding, and conservative decision-making are all essential today.

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January 2, 2017 at 7:15 am

MODERATE avalanche danger exists on all aspects above treeline and near treeline.  Below treeline, LOW avalanche danger exists.  Wind slab avalanches are the primary concern today, and are most likely near and above treeline.  A winter storm is currently impacting the advisory area.  Watch for changing conditions today, and expect the avalanche danger to quickly rise as snow accumulates.

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January 1, 2017 at 6:56 am

LOW avalanche danger exists on all aspects and elevations this morning. Expect increasing wind slab avalanche danger near and above treeline today with potential MODERATE danger late this afternoon as new wind slabs form.  Watch for unstable snow on isolated features in mid and upper elevation terrain. Be aware of firm and icy snow surfaces.  A slide for life could occur on steep slopes without immediate self-arrest. 

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December 31, 2016 at 7:07 am

LOW avalanche danger exists on all aspects and elevations and Normal Caution is advised.  Watch for unstable snow on isolated features in upper elevation terrain.  Natural and human triggered avalanches are unlikely today.  Be aware of firm and icy snow surfaces.  A slide for life could occur on steep slopes without immediate self-arrest. 

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December 30, 2016 at 6:58 am

For today, LOW avalanche danger exists for all aspects and elevations within the forecast area and normal caution is advised. 

Climbers, beware of firm and smooth snow surface conditions.  This is a serious concern for novice climbers. A slide for life will occur without immediate self arrest.

Exposed rocks on Mt Shasta are plastered in rime ice. This presents a significant hazard, especially as the day warms and the ice falls onto climbers below. Wear a helmet.

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December 29, 2016 at 6:47 am

For today, LOW avalanche danger exists for all aspects and elevations within the forecast area. A 48 hour northwest wind event has left the snowpack primarily wind scoured. Variable conditions prevail. Small, isolated wind slabs may linger on select terrain features above 10,000 feet in alpine terrain where cold temperatures and wind have sustained. Use normal caution.

Climbers, beware of firm and smooth snow surface conditions. A slide for life will occur without quick self arrest.

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December 28, 2016 at 6:58 am

The wind slab avalanche problem will remain the primary concern today. Wind slabs could be sensitive to trigger as moderate to strong northwest wind over the past 36 hours continues.

Overall, the avalanche danger is MODERATE near and above treeline. Isolated pockets of CONSIDERABLE danger may exist on select terrain features above treeline on Mt Shasta. LOW avalanche danger exists below treeline.

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December 27, 2016 at 6:50 am

The avalanche danger is MODERATE above treeline and near treeline.  LOW avalanche danger exists below treeline.  Wind slabs are the primary concern and are most likely to be found on N-NE-E-SE-S aspects.  Wind slabs may be 2-4ft thick.  Human triggered avalanches remain possible, and natural avalanches are unlikely.

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December 26, 2016 at 6:55 am

The avalanche danger is MODERATE above treeline and near treeline.  LOW avalanche danger exists below treeline.  Wind slabs are the primary avalanche concern.  On all aspects near and above treeline, wind slabs 2-4ft thick may exist.  Today, human triggered avalanches are possible, and natural avalanches are unlikely.  

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December 25, 2016 at 7:04 am

The avalanche danger is CONSIDERABLE above treeline and MODERATE near and below treeline.  Variable winds have created the potential for windslabs 2-4ft deep on all aspects near and above treeline.  Above treeline, human triggered wind slabs are likely and natural wind slabs are possible.  Storm slabs remain a secondary concern as the snowpack continues to adjust to the weight of the new snow.

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December 24, 2016 at 7:10 am

The avalanche danger is CONSIDERABLE above treeline and near treeline.  MODERATE danger exists below treeline today.  Wind slabs are most suspect on NW-N-NE-E-SE-S slopes in upper elevation terrain, but may be found on all aspects due to strong and variable winds.  Up to a foot of new snow has fallen recently, and the storm slab problem is a concern for today as well.

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December 23, 2016 at 6:51 am

A winter storm warning is in effect until 4pm today. Upwards of a foot of new snow and moderate southwest wind is forecasted near and above treeline on Mt Shasta. New wind slabs will build on primarily leeward NW-N-NE-E-SE facing slopes. CONSIDERABLE danger will be reached near and above treeline on said leeward slopes. For all other aspects and elevations MODERATE danger will prevail. Expect increasing avalanche danger & sensitivity for human trigger throughout in the day.

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December 22, 2016 at 6:12 am

Today, LOW avalanche danger will prevail for all aspects and elevations in the forecast area. Old, lingering wind slabs still exist above treeline in alpine terrain but have been difficult to trigger. Normal caution is advised. 

Smooth and icy slopes exists on the upper mountain. Slide for life conditions are present on Mt Shasta. Strong ice axe, crampons & self arrest skills are highly recommended. Always wear a helmet and carry a beacon, shovel and probe.

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December 21, 2016 at 6:17 am

MODERATE avalanche danger exists on all aspects above treeline.  Natural avalanches are unlikely, however human triggered avalanches remain possible above 8,500 feet.  Evaluate snow and terrain carefully, and identify features of concern.  LOW avalanche danger exists near and below treeline.

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December 20, 2016 at 6:52 am

MODERATE avalanche danger exists on all aspects above treeline.  Steady, westerly winds continue to transport snow making wind slabs the primary avalanche problem.  Natural avalanches are unlikely, and human triggered avalanches remain possible.  Evaluate snow and terrain carefully, and identify features of concern.  LOW avalanche danger exists near and below treeline.

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December 19, 2016 at 6:56 am

Above treeline, MODERATE avalanche danger exists on all aspects.  Natural avalanches are unlikely and human triggered avalanches remain possible.  The wind slab problem is the primary avalanche concern today.  SE, E, and NE aspects above treeline are where wind slabs are most likely to be found. Near treeline and below treeline, the avalanche danger is LOW.

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