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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 1, 2017 at 6:20 am

MODERATE avalanche danger will exist near treeline and above treeline today due to the wind slab avalanche problem. Northwest winds have contributed to wind loading on primarily S-SE-E aspects, but not limited to. Human triggered wind slabs near ridgelines and tops of bowls are possible.

Below treeline, avalanche danger is LOW. 

 

 

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February 28, 2017 at 6:45 am

This morning the avalanche danger is CONSIDERABLE near and above treeline due to wind slab formation on leeward aspects.  Pay attention to where wind loading has occurred and is still occurring.  When in doubt, stay on slopes less than 30 degrees. Loose sloughs and storm slabs are less likely to be a problem, but stay aware of their potential. Avalanche danger below treeline is MODERATE on steep terrain exposed to the effects of the wind.

 

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February 27, 2017 at 6:45 am

This morning the avalanche danger is CONSIDERABLE near and above treeline due to wind slab formation on leeward aspects.  Pay attention to where the snow is blowing and avoid slopes above 30 degrees where loading has occurred. Loose sloughs are still possible in areas where low density snow remains unbonded to the firmer layer beneath. Because of some shallow storm slabs observed yesterday, avalanche danger below treeline is MODERATE on steeper slopes.

 

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February 26, 2017 at 6:09 am

This morning, the avalanche danger remains MODERATE near treeline and above treeline. Avalanche danger could rise to CONSIDERABLE this afternoon as westerly winds increase and load leeward aspects with new and existing, light density snow. Triggering a fresh wind slab is likely late today. Pay attention to blowing snow and note wind direction! Avoid these leeward slopes. Loose dry sloughs on steeper aspects remain possible. Below treeline, the avalanche danger is LOW.

 

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February 25, 2017 at 7:00 am

The overall avalanche danger remains MODERATE today, near treeline and above treeline. The most dangerous places are at mid and upper mountain levels where 6-8 inches of  light density snow has or will be wind transported onto leeward ridgelines and tops of bowls. Calm winds are expected today but pay attention to any blowing snow! Avoid those leeward slopes for maximum safety. Be aware of triggering loose sloughs on steeper aspects. Below treeline, the avalanche danger is LOW.

 

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February 24, 2017 at 6:23 am

The overall avalanche danger is MODERATE today, near treeline and above treeline. The most dangerous places are at mid and upper mountain levels where new, light density snow has or will be wind transported onto leeward ridgelines and tops of bowls. If you see blowing snow, pay attention to wind direction and where that snow is headed! If you avoid these leeward slopes, you will avoid being in avalanche danger today.  Below treeline, the avalanche danger is LOW.

 

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February 23, 2017 at 6:21 am

Avalanche danger is CONSIDERABLE above treeline for fresh wind slabs that have formed over the past 24-48 hours. Wind slabs could have the ability to step down into older layers. Avalanche danger is MODERATE near treeline and LOW below treeline. While likely not a serious threat, small loose wet avalanches are possible today with recent fresh snow and sunny skies, despite below freezing temperatures. 

 

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February 22, 2017 at 7:04 am

For today, expect MODERATE avalanche danger for below treeline and near treeline areas. Skier or snowmobiler triggered wind slabs, storm slabs and unstable cornice features are possible. Above treeline, winds will switch to the northwest and CONSIDERABLE danger will prevail for fresh wind slabs on southerly slopes as light density snow is available for transport. 

 

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February 21, 2017 at 5:38 am

HIGH avalanche danger exists above treeline and near treeline.  The avalanche danger is CONSIDERABLE below treeline.  Several natural avalanches occurred yesterday, some of which were large enough to bury, injure, or kill a person.  Storm slab, wind slab, and cornice fall avalanches remain significant concerns for backcountry travelers.  Travel in or below avalanche terrain is not recommend.   

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February 20, 2017 at 7:07 am

The avalanche danger is HIGH near treeline and above treeline on all aspects.  CONSIDERABLE danger exists below treeline.  Wind slab, storm slab, and cornice fall avalanches pose significant concerns for backcountry travelers.  Natural avalanches are likley, and human-triggered avalanches are very likley.  Heavy snowfall and strong southerly winds will continue through tomorrow, keeping the avalanche danger elevated in the backcountry.  

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February 19, 2017 at 7:11 am

On all aspects near and above treeline, CONSIDERABLE avalanche danger exists.  Below treeline, the avalanche danger is MODERATE.  Wind slab, storm slab, and cornice fall avalanche problems pose significant concerns for backcountry travelers.  A potent storm will impact the advisory area today, bringing heavy snowfall and strong southerly winds.  Expect increasing avalanche danger in the backcountry overnight and by tomorrow.

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February 18, 2017 at 7:00 am

CONSIDERABLE avalanche danger exists near treeline and above treeline.  New snow and moderate E-S-W winds have created fresh wind slabs 2-4ft thick.  On wind-loaded slopes 35 degrees and steeper, human-triggered avalanches are likely and natural avalanches are possible.  The potential exists for cornice fall and storm slab avalanches as well.  The avalanche danger below treeline is MODERATE.

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February 17, 2017 at 7:00 am

Near treeline and above treeline, MODERATE avalanche danger will exist for wind slabs that have formed over the past 36 hours. Isolated slabs up to 2 feet thick will exist on primarily W-NW-N facing aspects.

Also, avoid fresh cornice formations along ridgelines and near the tops of bowls. 

Storm slabs may exist in sheltered areas near and below treeline on all aspects but unlikely to be triggered.

Below treeline, the overall danger is LOW. 



 

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February 17, 2017 at 6:49 am

Near treeline and above treeline, MODERATE avalanche danger will exist for wind slabs that have formed over the past 36 hours. Isolated slabs up to 2 feet thick will exist on primarily W-NW-N facing aspects.

Also, avoid fresh cornice formations along ridgelines and near the tops of bowls. 

Storm slabs may exist in sheltered areas near and below treeline on all aspects but unlikely to be triggered.

Below treeline, the overall danger is LOW. 



 

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February 16, 2017 at 6:46 am

In mid and upper elevation, wind exposed terrain, expect MODERATE danger on steep slopes that have recent deposits of wind drifted snow.

Leeward NW-N-NE aspects and some cross-loaded W and E aspects, steeper than 35 degrees, have the best potential for new wind slabs available for human trigger.

Below treeline, the avalanche danger is generally LOW.



 

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February 15, 2017 at 6:11 am

The avalanche danger is LOW and normal caution is advised for today. 

Tonight, the avalanche danger will rise with regards to new wind and storm slab problems, primarily near and above treeline. MODERATE to CONSIDERABE avalanche danger is likely to be met late tonight or tomorrow morning with high intensity wind and snowfall expected. 

Instabilities will lie within new snow layers or at the old snow-new snow interface.

 

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February 14, 2017 at 7:00 am

The avalanche danger is LOW and normal caution is advised.  The potential exists for falling rime ice in the alpine and isolated wet-loose instabilities with incoming solar radiation throughout the day.  A series of storms will begin to affect the advisory area tomorrow, bringing strong southerly winds and a mix of rain snow.  Expect increasing avalanche danger throughout the week.     

 

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February 13, 2017 at 6:43 am

LOW avalanche danger exists in the backcountry.  Loose-wet avalanche activity poses the greatest concern on sun-exposed slopes 35 degrees and steeper near and below treeline.  The potential for falling rime ice presents a significant objective hazard in the alpine.  Watch for changing conditions throughout the day.



 

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February 12, 2017 at 6:16 am

New wind slabs on primarily SW-W-NW facing aspects above 8500ft pose the greatest avalanche concern today. Expect overall MODERATE avalanche danger above treeline. Small, human triggered avalanches are possible on newly wind loaded slopes 35 degrees and steeper.  Natural avalanches are unlikely.  The avalanche danger is LOW near treeline and below treeline. Roller balls and loose-wet style instabilities are also possible today on southerly, lower elevation slopes but not expected to pose a serious threat to backcountry riders.

 



 

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February 11, 2017 at 6:58 am

MODERATE avalanche danger exists above treeline. Newly forming winds slabs on all aspects above 8500ft pose the greatest avalanche concern.  Human triggered avalanches are possible on wind loaded slopes 35 degrees and steeper.  Natural avalanches are unlikely.  The avalanche danger is LOW near treeline and below treeline today.

 



 

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