Haines Avalanche Center
Above 2,500ftHigh
1,500 to 2,500ftHigh
Below 1,500ftHigh
Degrees of Avalanche Danger
Avalanche Problems
Problem 1
Confidence : High. Distribution: Widespread. Recent new snow has added nearly 3″ of SWE to the upper snowpack that started cold and ended warm, an upside-down setup. This will be adding stress to any buried persistent weak layers further down. There will also likely be weak interfaces within the new storm snow. Strong southeast winds will have caused heavy wind loading on lee aspects and cross loading in gullies/terrain features. Natural and Human-triggered avalanches are likely today. Avoid terrain 28-degrees and steeper. This is a bad day to venture into avalanche terrain. Smaller slides could step down to deeper weak layers, causing wide propagation.
Likelihood:
- Almost Certain
- Very Likely
- Likely
- Possible
- Unlikely
Size:
- Historic
- Very Large
- Large
- Small
Trend
- Increasing
- Steady
- Decreasing
Problem 2
Confidence: Moderate to High. Distribution: Isolated to Widespread. We have two primary layers of concern:
- Melt-freeze crust from 1/10 down 60-80cm in elevations up to ~3000′
- New-Years Surface Hoar and Near-Surface-Facets interface ~100-120cm down in protected areas near tree-line, steep openings and alpine bowls.
Observations are limited. It is uncertain how these layers will react to the new load. These weak layers are tricky and could produce large avalanches with recent rapid loading of the new snow, especially in steep terrain, rollovers, and wind loaded areas. Today’s new snowfall, rain on snow, and strong south winds are adding a lot of stress to these deeper weak layers, creating a dangerous situation.
(Surface hoar near-treeline in the Transitional Zone 12/31. Once buried by wind slab or new snow these feathery crystals become a dangerous persistent weak layer that will require extremely careful assessment and overall immediate avoidance in avalanche terrain. Photo: Tim Thomas)
Likelihood:
- Almost Certain
- Very Likely
- Likely
- Possible
- Unlikely
Size:
- Historic
- Very Large
- Large
- Small
Trend
- Increasing
- Steady
- Decreasing
Avalanche Activity
Bottom Line: An additional foot of new snow at higher elevations last night, with strong southeast winds and increasing temperatures. Near sea-level: above freezing temperatures and rain. Recent snow sits over a melt-freeze crust down 60-80cm formed briefly 1/10 as temperatures spiked. Below that down 100-120cm in areas are the New-Years surface hoar and/or facets. Elevations below 1500′ expect snow to become saturated with wet avalanches possible in steep terrain.
Avoid avalanche terrain today. Even small slides can kill, especially when they run into terrain traps. In times of high danger, route-finding skills are essential.
Weather
Around 1.7″ of precipitation fell over mountain areas Thursday-Friday, with roughly 16-24″ of new snow accumulation and some rain up to 2000ft. Another storm moves in midday Saturday, with another 1″+ of precipitation likely by Sunday Morning and snow levels near 1000ft. Winds will be light northerly Saturday, becoming strong southerly on Sunday. The Mt. Ripinsky weather station is completely buried and no longer reporting snow depth.
Snow Depth [in] | Last 24-hr Snow/SWE [in] | Last 3-days Snow/SWE [in] | Today’s Freezing Level [ft] | Today’s Winds | Next 24-hr Snow/SWE | |
Mount Ripinsky @ treeline | 135″+* | 12″ / 1.00* | 16″ / 2.50* | 1500′ | strong SE | 1″ / 0.10* |
Flower Mountain @ treeline | 108″ | 8″ / 1.00 | 20″ / 2.50 | 1000′ | strong SE | 0″ / 0.00* |
Chilkat Pass @ 3,100ft | 70″ | 10″ / 0.80 | 17″ / 2.30 | 1000′ | strong SE | 0″ / 0.00* |
( *star means meteorological estimate )
Additional Information
Practice like you play. Dust off your gear and make sure it is fully functional. Put new batteries in your beacons! Make sure everyone in the group has a functioning beacon, shovel and probe – and knows how to use them, keep your skills fresh. If you head into the hills, watch out for red flag avalanche conditions, natural avalanches, whumphing or collapsing, and shooting cracks.
Education Video Links:
- AIARE
- How to Practice Avalanche Rescue Snowmobile Edition: https://youtu.be/2ML499MMDfM
- AK Sled Shed Motorized Learning:
- Intro: https://youtu.be/aoagKHfGkxs
- Personal Electronics in Avalanche Terrain: https://youtu.be/2Vz9S0OEyFk
- Snowmobile Macgyver Tool Kit: https://youtu.be/4WBNu_t6Bbk
- Head and Face Protection: https://youtu.be/jIzW89wOyZI
- Pre-season prep: https://youtu.be/zJmrb8cZlR4
- My Transceiver: https://youtu.be/yblaDWP7Jf8
- BCA Avalanche Safety for Snowmobilers
- How to Fix Common Snowmobile Problems in the Field: https://youtu.be/g9fiTxEvuFk
- Sleducation: Avalanche Safety for Snowmobilers: https://youtu.be/EWFOd_9DYb8
- Intro to Avalanche Transceivers for Snowmobilers: https://youtu.be/6ZLSBmsceog
- Avalanche Transceiver Trailhead Test for Snowmobilers: https://youtu.be/rWoXbadFBsY
- Avalanche Transceiver Searching Use Snowmobiles: https://youtu.be/w1ucyI6LMXM
- BCA Avalanche Rescue Series
- Beacon Search 101: https://youtu.be/nnHXLVA2FcE
- Avalanche Probing 101: https://youtu.be/-0_yDN5Drzw
- Avalanche Shoveling 101: https://youtu.be/dGQg9o3vAkM
- Organizing a Backcountry Rescue: https://youtu.be/gywtmukgt8s
- Post Avalanche Patient Care: https://youtu.be/9FyIeUy4wpQ
- Backcountry Evacuation: https://youtu.be/WPF-dciefL8
- Complex Multiple Burials Backup Techniques: https://youtu.be/pB6AfY2KyYo
- National Avalanche Center
- Avalanche Problems Explained: https://youtu.be/DkbnT_9-cHU
- Intro to North American Avalanche Danger Scale: https://youtu.be/r_-KpOu7tbA
Announcements
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