Turnagain Pass Avalanche Forecast
Saturday, Apr 18th UPDATE:
DANGEROUS AVALANCHE CONDITIONS continue in the backcountry today and through the weekend. Travel in avalanche terrain is NOT recommended, avalanches can run into valley bottoms and be very large and dangerous.
Yesterday was another very active avalanche day. The snowpack continued to ‘fall apart’ with multiple large to very large wet loose, wet slab and glide avalanches observed in Girdwood, Portage, Turnagain Pass, Summit Lake and south to Seward. These were large wet avalanches releasing due the snowpack warming dramatically. Many of these ran to the ground taking out the entire season’s snowpack. Today temperatures remain above freezing and skies will be partly sunny. Rain is in the forecast tomorrow into next week. Expect avalanche activity to continue during this shed cycle.
This is not a time to be on hiking trails or in the backcountry unless you know for certain you are well away and far out from under avalanche paths. Roofs with remaining snow/ice are also likely to shed – heads up!
This is the final conditions update. The CNFAIC is wrapping up operations for the season. We would like to thank everyone for their support during the past two weeks of suspended forecasts. Look for our Annual Report on April 25th. Although the forecasts have finished, the avalanche season has not – please see below for some SPRINGTIME AVALANCHE TIPS.
We would like to extend a huge THANK YOU to all the folks who have taken the time to send in observations over the season. Your reports are integral in providing the highest quality information.
Additionally, THANK YOU to all of you who have supported the CNFAIC through donations, memberships and a variety of other means. This is the foundation we continue to build upon – we would not be here without you!
We would also like to thank our non-profit arm, the Friends of the CNFAIC. Half of our operating budget comes directly from you through the ‘Friends’ organization. This amazing and selfless group has a tireless passion for keeping us safe in the backcountry. Their fundraising efforts allow the Avalanche Center to be a reality – literally. And of course, we would not be here without the support of the Forest Service and the wonderful Glacier Ranger District.
Last but far from least, we would like to thank our professional partners for sharing their insights, information and wisdom, which greatly improve our forecasts:
Two examples of the many large avalanches observed yesterday. Most of the images throughout the Springtime Tips are from the avalanche cycle over the past two days.
SPRINGTIME AVALANCHE TIPS – Timing is everything! The spring transition can have an unexpected effect on snowpack characteristics. Stable snow can become weak and hazardous in a matter of hours. What to look for? Ask yourself these questions: Am I dealing with winter snow (cold and dry) or spring/summer snow (wet, warm and/or crusty and refrozen)? Or is it some combination? What weather factors have affected the snowpack today and recently?
Remember the Red Flags that indicate instability!
On any given day conditions can range from warm and sunny T-shirt weather, to pouring rain, to cold and snowy mid-winter conditions. Being able to recognize and respond to specific avalanche concerns is key in making effective decisions in avalanche terrain.
Hiking on summer trails during the springtime warm-up (including the Byron Glacier trail, Crow Pass, Devil’s Pass, Russian Lakes trail and Crescent Creek trail) can be very dangerous. Extra caution is advised for trails that cross under avalanche paths. Avoid being under large snow covered slopes this spring as avalanche hazard does remain. Most common times for natural springtime avalanches are during sunny afternoons/evenings or periods of warm rainy weather. Know that an avalanche occurring above you could send debris to snow-free zones and valley floors.
Loose Snow Avalanches: Both dry and wet loose avalanches are common springtime avalanche concerns. Pay close attention in steep terrain, especially when the sun first hits freshly fallen snow. Remember loose avalanches can be particularly hazardous if they push you into a terrain trap. Wet loose avalanches can trigger wet slabs on the slopes below.
Wet Slab Avalanches: Wet slab avalanches are a combination of a slab, a weak layer or interface and water percolating down to the weak layer or interface. Often times there is a crust involved as the bed surface or some harder layer that the water lubricates. As temperatures rise and/or rain falls at upper elevations these could happen even on the Northerly slopes. These tend to be large and destructive when water is first being rapidly introduced to a somewhat drier snowpack.
Dry Slab Avalanches: It is still possible to get significant snowfall this time of year. If it is raining hard at lower elevations depending on the temperature it may being snowing hard up high. Pay attention to how much new snow has fallen and what surface it is sitting on. Is there a foot of new snow sitting on surface hoar or facets or a hard crust or over wet snow? Even without a persistent weak layer between the slab and the bed surface, it is still possible to trigger dangerous slab avalanches. These slabs may also be tender and reactive right as they start to warm in the spring sun or with a rapid temperature rise.
Wind Slabs: It is also important to continue to pay attention to wind direction and loading patterns. New snow or older dry loose snow can quickly be loaded on leeward slopes and form touchy wind slabs. Look for areas of pillowed snow and watch for cracking. Again, you may be seeing a rain storm and forget that it is actually snowing and blowing up high. Check the weather page! What direction has the wind been blowing from? How strong for how long?
Cornices: Some slopes still have large cornices looming above them. Knowing exactly what will tip the scales is difficult. Some factors that contribute to cornice fall are direct sun, heat from rising temperatures, and new snow with wind. Give cornices a wide berth and take measures to minimize your exposure beneath them. Remember they have a tendency to break much further back than expected.
Glide Avalanches: Glide cracks are appearing and we have had releases this week. Remember glide avalanches are very unpredictable, not triggered by humans and that they are the entire snowpack sliding to the ground. Avoid travel under glide cracks.
Below are some ways to both anticipate and deal with the above mentioned avalanche concerns:
When you are done recreating for the winter season remember to take care of your avalanche gear!
|05/22/23||Turnagain||Avalanche: Tincan||Nick D'Alessio|
|05/12/23||Turnagain||Avalanche: Tincan, Sunburst, Magnum, Cornbiscuit||Heather Thamm|
|05/07/23||Turnagain||Observation: Tincan – Bear Tracks||CNFAIC Staff|
|05/05/23||Turnagain||Observation: Seattle Ridge||AS/ WW Forecaster|
|05/02/23||Turnagain||Observation: Cornbiscuit||Schauer/ Sturgess Forecaster|
|05/02/23||Turnagain||Observation: Seward Hwy Turnagain Pass||Joel Curtis|
|04/30/23||Turnagain||Observation: Magnum||Ayla, Kit Crosby, Barton|
|04/29/23||Turnagain||Observation: Tincan||John Sykes|
|04/28/23||Turnagain||Avalanche: Taylor Pass/Pastoral||Schauer/ Creighton Forecaster|
|04/28/23||Turnagain||Avalanche: Tincan||Andy Moderow|
Status of riding areas across the Chugach NF is managed by the Glacier and Seward Ranger Districts, not avalanche center staff. Riding area information is posted as a public service to our users and updated based on snow depth and snow density to prevent resource damage at trailhead locations. Riding area questions contact: email@example.com
|Area||Status||Weather & Riding Conditions|
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This is a general backcountry avalanche advisory issued for Turnagain Arm with Turnagain Pass as the core advisory area. This advisory does not apply to highways, railroads or operating ski areas.