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., 09/24/2017
E.g., 09/24/2017
Date the advisory was published: Bottom Line
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January 27, 2017 at 6:11 am

Overall, LOW avalanche danger exists for most aspects and elevations within the forecast area today. Blowing snow was visible above 12,000 feet  on Mt Shasta yesterday and new, small wind slabs may have formed in higher elevation areas. MODERATE danger will continue for those steep slopes that spill off the upper mountain. Climbers or ski mountaineers should also be cautious of falling rime ice as they make their ascent.

 

 

 

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January 26, 2017 at 6:20 am

One will find LOW avalanche danger in below and near treeline areas today. Above treeline, MODERATE danger remains for existing wind slabs. Above treeline and on the upper mountain, unsupported slopes steeper than 37 degrees will present the best chance of hosting small to large wind slabs. Wind slabs will be stubborn to trigger, however consequences could be devastating. Climbers should beware if choosing to make a winter ascent of Shasta during our current spell of good weather.

 

 

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January 25, 2017 at 6:58 am

MODERATE avalanche danger exists in near and above treeline terrain steeper than 35 degrees concerning the wind slab avalanche problem. Human triggered wind slabs are still possible and while stubborn to trigger, could produce a large and dangerous avalanche. LOW avalanche danger presides below treeline. Unstable cornices also remain within the forecast area.

 

 

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January 24, 2017 at 7:07 am

CONSIDERABLE avalanche danger exists near treeline and above treeline.  The avalanche danger is MODERATE below treeline.  Dangerous conditions exist in the backcountry.  Wind slab avalanches have the potential to be large and destructive.  Storm slab and cornice fall avalanches remain concerns.  Natural avalanches are possible, and human triggered avalanches are likely today.

 

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January 23, 2017 at 7:01 am

HIGH avalanche danger exists above treeline and near treeline on wind loaded slopes steeper than 35 degrees.  CONSIDERABLE danger exists below treeline.  Wind slab, storm slab, and cornice fall avalanches all have the potential to be very large and dangerous today. Travel in avalanche terrain is not recommended, and avalanche path runout zones should be avoided. 

 

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January 22, 2017 at 7:10 am

HIGH avalanche danger exists near and above treeline.  CONSIDERABLE danger exists below treeline.  Large and destructive wind slab and storm slab avalanches are likely to occur naturally, and very likely to be human triggered.  Large cornice formations pose a significant concern as well.  Travel in avalanche terrain is not recommended.  The NWS Winter Storm Warning remains in effect until 4pm this afternoon.

 

 

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January 21, 2017 at 7:03 am

HIGH avalanche danger exists in the backcountry above treeline and near treeline.  Below treeline the danger is CONSIDERABLE.  Wind slab avalanches are the primary concern, and additional storm slab and cornice problems complicate conditions.  Natural avalanches are likely, and human-triggered avalanches are very likely.  Snowfall is expected to continue, and the NWS has issued a Winter Storm Warning in effect 4pm this afternoon until 4pm Sunday

 

 

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January 20, 2017 at 6:32 am

...A winter storm warning is in effect until 4pm PST this afternoon... winter storm watch is in effect from Saturday afternoon through Sunday afternoon...

Today and the weekend, another series of winter storms will add an additional 1 to 2 feet of snow on top of already several feet of new snow from the past two days. Wind slabs near and above treeline remain the primary concern. CONSIDERABLE to HIGH avalanche danger will continue for slopes steeper than 30 degrees. 

 

 

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January 19, 2017 at 7:01 am

Several feet of new snow and gale force south wind over the last 24 hours has created HIGH avalanche danger near and above treeline. CONSIDERABLE danger exists below treeline. Stay off of and out from underneath slopes steeper than 30 degrees today. Wind slabs, storm slabs and cornices have gained size, distribution and sensitivity. An additional winter storm warning is in effect from 10pm this evening to 4pm PST Friday.

 

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January 18, 2017 at 6:55 am

LOW avalanche danger this morning is expected to rise rapidly today and reach a CONSIDERABLE to HIGH danger rating by afternoon hours. A winter storm warning is in effect bringing hurricane force winds and feet of new snow to the forecast area over the next 24 hours. Wind slabs, storm slabs and cornices will increase in size, distribution and sensitivity as the day progresses. Expect dangerous avalanche conditions in the afternoon hours on slopes steeper than 30 degrees.

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January 17, 2017 at 6:12 am

The avalanche danger is LOW on all aspects and at all elevations.  While triggering an avalanche is unlikely today, unstable snow may still exist in isolated wind-affected terrain near and above treeline.  A significant winter storm is expected to begin by tomorrow.  Watch for changing conditions, and expect the avalanche danger to rise with incoming new snow and strong southerly winds.

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January 16, 2017 at 7:03 am

LOW avalanche danger exists in the backcountry on all aspects and at all elevations.  A wind slab problem remains the primary concern near and above treeline.  Natural and human-triggered avalanches are unlikely.  LOW danger does not mean that no danger exists.  Continue to evaluate the snowpack, and watch for unstable snow on isolated terrain features.

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January 15, 2017 at 6:02 am

MODERATE avalanche danger continues above treeline on all aspects above 10,000 feet.  LOW avalanche danger exists near and below treeline.  Wind slabs and cornices are the avalanche problems for the day.  Triggering stubborn wind slabs/cornices remains possible. This is a low likelihood, high consequence situtation. Winds slabs/cornices have been very stubborn to trigger, but if set loose, a large and devastating avalanche could occur. Evaluate snow and terrain carefully and identify features of concern.

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January 14, 2017 at 7:03 am

The avalanche danger is MODERATE above treeline.  LOW avalanche danger exists near and below treeline.  On all aspects near and above treeline, wind slabs and cornices are the avalanche problems for today.  Triggering stubborn wind slabs or cornices remains possible for backcountry travelers, and an avalanche event in these conditions would likely pose significant consequences for anyone involved. Evaluate snow and terrain carefully today, and identify features of concern.

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January 13, 2017 at 6:40 am

Below treeline LOW avalanche danger exists while MODERATE danger near and above treeline continues for the possibility of human triggered wind slab avalanches. Wind slabs have been stubborn to trigger, however have the potential to be large and devastating to human life. Pay attention to who is above you, ski one at a time in avalanche terrain and don't group up in run out zones. Blue skies does not mean you get to let your guard down.

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January 12, 2017 at 6:31 am

A lack in above treeline observations on Mt Shasta leaves uncertainty regarding wind slab stability. Blue skies will lure riders into the alpine. Old and newly formed wind slabs could be triggered by a skier or rider today. Expect MODERATE avalanche danger near and above treeline, all aspects. Below treeline, LOW danger will prevail. Proceed with caution above treeline. Do NOT let your guard down today.

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January 11, 2017 at 7:09 am

Today, CONSIDERABLE avalanche can be expected near and above treeline and MODERATE danger below treeline. Wind slabs and unstable cornice features were abundant yesterday and are likely to continue today. Clearing skies may lure backcountry riders into above treeline terrain where observations have been limited. Proceed with caution. Feet of new snow and west/southwest winds have created a combination of avalanche problems, each of which could produce large avalanches.

 

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January 10, 2017 at 7:13 am

HIGH avalanche danger exists near treeline and above treeline on all aspects.  CONSIDERABLE avalanche danger exists on all aspects below treeline.  Today, the backcountry presents complex conditions, and a mix of avalanche problems. The potential for large and destructive avalanches exists. Travel in avalanche terrain is not recommended.  Avalanche path run-out zones should be avoided.  Natural avalanches are likely, and human-triggered avalanches are very likely. 

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January 9, 2017 at 7:17 am

HIGH avalanche danger exists on all aspects above treeline and near treeline.  CONSIDERABLE avalanche danger exists on all aspects below treeline.  Wind slab, storm slab, and persistent slab avalanche problems present significant concerns today.  Natural avalanches are likely and human triggered avalanches are very likely.  Very dangerous avalanche conditions exist in the backcountry, and travel in or below avalanche terrain is not recommended.

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January 8, 2017 at 7:11 am

HIGH avalanche danger exists on all aspects and at all elevations.  Very dangerous conditions exist in the backcountry today.  Travel in and below avalanche terrain is not recommended.  Wet slab, wind slab, and persistent slab avalanches are all significant concerns today.  Natural avalanches are likely, and human-triggered avalanches are very likely.

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