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CONSIDERABLE avalanche danger exists both in the Alpine and at Treeline. Due to a four day rain event wet saturated snow up to 3′ thick could be triggered below 2500′. At higher elevations heavy snow is sitting on top of cold weak snow below making it possible to trigger a large slab avalanche up to 4′ thick on all aspects. Avoid steep slopes and high consiquence terrain features. Careful snowpack evaluation, cautious route finding and conservative decision-making are essential skills if venturing into the mountains today.
No Rating below Treeline (below 1000′) means there is currently not enough snow to produce an avalanche at this elevation band.
DANGEROUS AVALANCHE CONDITIONS REMAIN IN MANY AREAS around Southcentral Alaska.
Due to high avalanche danger the East Hatcher Pass Management Area is closed to public use until further notice. For current information visit DNR Newsroom and hatcherpassavalanchecenter.org
The search for a missing skier in Hatcher pass continues today. Click HERE for latest media release from the Hatcher Pass Avalanche Center.
An avalanche was reported yesterday near Anchorage in the Front Range on the Powerline Pass trail. Limited information is known at this time, but warrents extra caution on all hiking trails near steep terrain in Southcentral Alaska. Click here for observation and photos.
Travel Advice | Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features. | Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern. | Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding, and conservative decision-making essential. | Very dangerous avalanche conditions. Travel in avalanche terrain not recommended. | Extraordinarily dangerous avalanche conditions. Avoid all avalanche terrain. |
Likelihood of Avalanches | Natural and human-triggered avalanches unlikely. | Natural avalanches unlikely; human-triggered avalanches possible. | Natural avalanches possible; human-triggered avalanches likely. | Natural avalanches likely; human-triggered avalanches very likely. | Natural and human-triggered avalanches certain. |
Avalanche Size and Distribution | Small avalanches in isolated areas or extreme terrain. | Small avalanches in specific areas; or large avalanches in isolated areas. | Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas. | Large avalanches in many areas; or very large avalanches in specific areas. | Very large avalanches in many areas. |
Over the last three days 4″ of water fell in the form of rain at lower elevations in Turnagain Pass. Rain/snow line fluctuated between 1800’ and 2500’ leaving the snow saturated with water. Several large wet avalanches were observed along the Seward Highway and Portage Valley over the last two days. Warm temperatures will persist today making it possible to trigger a wet avalanche on steep terrain features. Avoid this hazard by choosing low angle terrain away from large slopes and terrain traps.
*If temperatures drop below freezing this concern will stabilize quickly as water drains and the slab strengthens in the mid elevation zone.
Debris from a wet avalanche in Portage Valley. This avalanche likely released on the morning of Nov.27th.
Strong Northeast winds topped out at 109 mph on Sunburst weather station yesterday morning. Windslabs over 4’ thick on leeward aspects and crossloaded terrain features are a concern for today in the upper elevation zone. Avoid smooth pillow shaped snow on steep slopes and convexities. Even small features if steep enough could break well above you and have plenty of volume to bury a person. Obvious clues like shooting cracks and whumpfing sounds may not be present today making this avalanche problem difficult to identify.
In the upper Alpine above 2500’ weak faceted snow that formed during a cold snap has been covered up by 4’ of heavy snow creating an upside down snowpack. Last week observations showed a large variation in the distribution of this weaker snow below. It is likely that Northern aspects will harbor the bulk of this problem, but until more information is gathered much uncertainty exists as to how well this new snow has bonded with the older less stable snow below it. This is just one more high consequence reason to avoid steep terrain today.
A very wet and warm storm passed through Southcentral Alaska leaving the region with above freezing temperatures and high-sustained winds for multiple days. In Turnagain Pass rain/snow line reached 2500′, Easterly ridgetop winds maxed out above 100mph and 4 € of water fell over a three-day period.
Showery weather in the form of mixed rain and snow is expected today and into the weekend with rain/snow line moving to 1000′. Temperatures will hover just above freezing (32F) and begin to cool slightly by this evening. Easterly ridgetop winds 20-30mph are also expected to depreciate by early evening. This pattern will continue through the weekend with patches of clear sky at times.
*Seattle Wx Station wind data is currently not available.
Temp Avg (F) | Snow (in) | Water (in) | Snow Depth (in) | |
Center Ridge (1880′) | 32F | 0 | 1.4 | 25 |
Summit Lake (1400′) | 33F | 0 | 0.2 | 10 |
Alyeska Mid (1700′) | 34F | 0 | 2.0 | 13.5 |
Temp Avg (F) | Wind Dir | Wind Avg (mph) | Wind Gust (mph) | |
Sunburst (3812′) | 26F | NE | 23 | 98 |
Seattle Ridge (2400′) | 28F | *N/A | *N/A | *N/A |
Date | Region | Location | Observer |
---|---|---|---|
04/16/24 | Turnagain | Observation: Cornbiscuit | Krueger / Matthys Forecaster |
04/15/24 | Turnagain | Observation: Taylor Pass | John Sykes Forecaster |
04/15/24 | Turnagain | Observation: Seward Highway – Tern Lake to Portage | Joel Curtis |
04/14/24 | Turnagain | Observation: Sunburst | T. Olsen-Lund, R. Sullivan I. Adams |
04/14/24 | Turnagain | Observation: Turnagain Pass Snomo | K. Gallaher |
04/13/24 | Turnagain | Observation: Spokane Creek | Everet Megli |
04/11/24 | Turnagain | Observation: Tincan | John Sykes Forecaster |
04/10/24 | Turnagain | Avalanche: Seattle Ridge | Schauer/ Keeler Forecaster |
04/10/24 | Turnagain | Observation: Cornbiscuit South Face | Todd Kelsey |
04/10/24 | Turnagain | Avalanche: Tincan | N. Dumont J. Carlberg |
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