In the last 24 hours an additional .8″ of moisture fell either as rain or above 1800′ as snow. This added on to the 10 inches of water we received this week. Yesterday there was a window to get out and see some of the natural avalanche activity from the past two days. There were some wet slab avalanches and recent glide avalanches in the Treeline elevation band and some storm slabs in the Alpine. An observer watched a storm slab avalanche occur as the sun shined onto the slope. Today all of our storm snow concerns will still be present and human triggering is likely. Avoid slopes steeper than 30 degrees and steer clear of cornices. The snowpack still really needs time to adjust to all the loading from the past week.
Storm Slabs: Fluctuating temperatures and snowfall may have combined to create storm slabs. These could still be triggered and if there are patches of sun today or a temperature spike the reactivity of the snowpack will increase.
Cornices: Natural cornice fall activity is possible and could trigger an avalanche on the slope below. This is something you want to avoid traveling on or underneath. Cornices will be tender and could break farther back than expected. Falling down the slope with a refrigerator to school bus sized chunk of snow on your snowmachine or skis would be terrible, if not deadly. Cornices will also be even more likely to be triggered if the temperatures increase or they receive direct sunlight.
Wind Slabs: Winds today will continue to add stress to very large wind slabs in leeward terrain. Triggering one of these could be very dangerous due to the depth of slab. Avoid steep wind-loaded slopes. These will also be more hazardous with any rapidly warming temperatures or on sunny aspects.
Natural sun induced storm slab yesterday.
The snowpack in the mid elevation band (1000′-2500′) has received a significant amount of loading in the form of mostly rain the past week and temperatures have been fairly warm. There is a deep snowpack gliding down the slopes. Over the last few days a handful of glide avalanches have occurred in steep terrain and it is possible more will release today or did with the cooling overnight or will with any sun today. They are still totally unpredictable. Who knows… The fact that is Leap Year today may cause glide avalanches?? Glides threaten a lot of well-travelled terrain on both the motorized and non-motorized side of the highway. Avoid travel below existing glide cracks.
This glide avalanche on Seattle Ridge that occurred on Friday morning is a great reminder that they do release in popular recreating terrain.
Temperatures have cooled overnight and are forecasted to remain cooler throughout the day. This will have locked up much of the wet surface snow in a crust. The concern today will be primarily any direct sunlight on the slopes and subsequent rapid warming. This could make triggering a wet slab or wet loose avalanche possible on steep slopes that still are mostly saturated. If you find yourself all of a sudden sinking into sloppy snow it’s time to get off the slope. Watch for natural and human trigger roller ball activity. This is an indication that the surface snow is loosing strength.
Wet slide activity observed yesterday on Seattle Ridge. This occurred sometime in the last two days.
Yesterday was mostly cloudy in the morning with rain and snow falling. Skies cleared in the afternoon. Temperatures were in the 30Fs dropping into the 20Fs overnight. Winds were easterly,15-35 mph with some stronger gusts. The advisory area received an additional .5-.8″ of water, 5-10 inches of snow at upper elevations. Rain fell up to at least 1800′.
Today will be mostly cloudy with rain and snow showers forecasted throughout the day, 1-3 inches of snow possible. Rain/snow line will be approximately 1100′. Temperatures are forecasted to be a bit cooler with a high around 33 at 1000′ and staying in the mid 20Fs at higher elevations. Winds will be 15-25 mph from the East. There may be some periods of clearing during the day.
Tonight and Tuesday will be similarly mostly cloudy with rain and snow showers. There is a drying trend and a pattern shift looking later into the week with some clear sunny days in the forecast.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||30||rain||.8||146|
|Summit Lake (1400′)||30||2 and rain||.5||42|
|Alyeska Mid (1700′)||32||1.5 and rain||.7||105|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||27||n/a||n/a||n/a|
|05/18/21||Turnagain||Observation: Tincan Ridge||Joe Kurtak|
|04/30/21||Turnagain||Observation: Sunburst||W Wagner Forecaster|
|04/27/21||Turnagain||Observation: Tincan Ridge||Joe Kurtak|
|04/26/21||Turnagain||Observation: Magnum||Creighton/ Hoople|
|04/25/21||Turnagain||Observation: Sunburst||Nick D'Alessio|
|04/24/21||Turnagain||Observation: Airplane obs||Johnston-Bloom / DiJulia /Hilliard Forecaster|
|04/24/21||Turnagain||Observation: Corn biscuit||Heather Johnson|
|04/23/21||Turnagain||Avalanche: Lynx Ck Drainage||W Wagner Forecaster|
|04/23/21||Turnagain||Avalanche: Sunburst||Eeva Latosuo|
|04/23/21||Turnagain||Observation: Center Ridge Turnagain pass||Joe Kurtak|
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: firstname.lastname@example.org
|Area||Status||Weather & Riding Conditions|
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.