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., 07/25/2017
E.g., 07/25/2017
Date the advisory was published: Bottom Line
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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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February 10, 2017 at 6:39 am

The wind slab avalanche problem above treeline is all that remains after several inches of rain up to 8,500 feet impacted the forecast area over the past 48 hours. Expect CONSIDERABLE avalanche danger for remaining and potentially new wind slabs on primarily N-NE-E facing slopes at mid and upper mountain levels. Rain on snow with cooling temperatures has given way to LOW danger below and near treeline.

 



 

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February 9, 2017 at 6:51 am

The wet loose avalanche problem will remain a concern today in below and near treeline terrain steeper than 35 degrees. Above treeline, the wind slab avalanche problem remains as high intensity snowfall and gale force southerly winds have been and will continue to rapidly load primarily the top half of the compass. Expect HIGH avalanche danger for wind slabs above treeline and MODERATE danger below and near treeline for loose wet avalanches.



 

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February 8, 2017 at 7:06 am

Wind slab, loose-wet/wet slab and cornice problems are expected today and overall, CONSIDERABLE avalanche danger. High wind and flood warnings are in effect through Thursday evening. Several inches of rain on snow up to 8,500 feet and high intensity snowfall above this elevation is expected over the next 48 hours with gale force winds out of the south. Be aware of avalanche run out zones and the potential for large avalanches coming from above. 

 

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February 7, 2017 at 6:24 am

 The avalanche danger is CONSIDERABLE above treeline and near treeline, while MODERATE danger exists below treeline.  Previously formed wind slabs and cornices pose significant concerns to backcountry travelers.  Up to a foot of new snow fell overnight above 6500ft.  Continued southwest winds will add to existing wind slabs and will build fresh wind slabs.  Cornices will continue to grow in size. Natural avalanches are possible, and human triggered avalanches are likely on wind loaded slopes 35 degrees and steeper.

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February 6, 2017 at 6:43 am

CONSIDERABLE danger exists above treeline and near treeline.  The danger is MODERATE below treeline.  Over a foot of new snow fell overnight throughout the majority of the advisory area, and strong to extreme southwest winds have continued to blow.  Stiff wind slabs and sensitive cornice formations exist in the backcountry and will grow in size and distribution today.  Natural avalanches are possible, and human triggered avalanches are likely on wind loaded slopes 35 degrees and steeper.

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February 5, 2017 at 6:24 am

CONSIDERABLE danger exists above treeline and MODERATE danger exists near treeline.  Wind slabs are the primary avalanche concern and will continue to build in size and distribution with new snow and strong southwest winds expected during the next 24 hours.  The avalanche danger is LOW below treeline.

 

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February 4, 2017 at 6:16 am

Strong winds and blizzard conditions will continue today.  Wind slabs pose a significant concern for backcountry travelers near and above treeline on W, NW, N, NE, E, SE aspects.  The avalanche danger is CONSIDERABLE above treeline, MODERATE near treeline, and LOW below treeline.  Expect increasing avalanche danger with elevation gain, and as additional snow accumulates over the next few days.

 

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February 3, 2017 at 6:57 am

Strong winds with blizzard conditions are certain near and above treeline today. Wind slabs from yesterday will continue to grow in size and distribution as southwesterly flow and moderate to high intensity snowfall occurs over the forecast area. Expect increasing avalanche danger today and as one gains elevation... LOW danger below treeline, MODERATE near treeline and CONSIDERABLE above treeline. Short periods of HIGH danger are possible above treeline late this afternoon.

 

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February 2, 2017 at 6:58 am

Today, increasing avalanche danger can be expected as a winter storm brings high winds and new snow to the forecast area. The primary concern will lie above treeline as MODERATE avalanche danger this morning will rise to CONSIDERABLE danger this afternoon with the formation of new wind slabs. Expect MODERATE danger near treeline. Below treeline, LOW danger will continue due to lack of significant new snow accumulation and wind.

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February 1, 2017 at 6:59 am

MODERATE avalanche danger exists above treeline on N, NE, E, and SE aspects. Wind loaded slopes steeper than 35 degrees in alpine terrain are the areas where the wind slab problem poses a concern for backcountry travelers. Small to medium size human-triggered avalanches are possible in these specific areas today. LOW avalanche danger exists for all aspects near and below treeline.

A winter weather advisory is in effect from 10pm this evening to 4pm PST Thursday.

 

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January 31, 2017 at 6:17 am

MODERATE avalanche danger exists above treeline on N, NE, E, and SE aspects.  Wind loaded slopes steeper than 35 degrees in alpine terrain are the areas where a wind slab problem poses a concern for backcountry travelers. Small human-triggered avalanches remain possible in these specific areas today.  Natural avalanches are unlikely.  LOW avalanche danger exists for all aspects near treeline and below treeline.

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January 30, 2017 at 5:42 am

MODERATE avalanche danger continues above treeline, primarily in terrain above 10,000ft and on wind loaded slopes steeper than 35 degrees.  LOW avalanche danger exists for all aspects near treeline and below treeline.  Snow is available for transport, and fresh wind slabs may build today.  With sunny skies and warm temperatures expected, be on the lookout for falling rime ice as well as possible wet loose snow surface instabilities.  

 

 

 

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January 29, 2017 at 5:42 am

MODERATE avalanche danger continues above treeline, primarily in terrain above 10,000ft and on wind loaded slopes steeper than 35 degrees.  LOW avalanche danger exists for all aspects near treeline and below treeline.  Snow is available for transport, and fresh wind slabs may build today.  With sunny skies and warm temperatures expected, be on the lookout for falling rime ice as well as possible wet loose snow surface instabilities.  

 

 

 

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January 28, 2017 at 6:27 am

MODERATE avalanche danger continues above treeline, primarily in terrain above 12,000ft and on wind loaded slopes steeper than 35 degrees.  LOW avalanche danger exists for all aspects near treeline and below treeline.  Snow is available for transport, and fresh wind slabs may build today.  With sunny skies and warm temperatures expected, be on the lookout for falling rime ice as well as possible wet loose snow surface instabilities.  

 

 

 

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