The region has received 2″ of rain in the past 24 hrs. The rain fell at least as high as 3000′. Another half an inch of rain is forecasted to fall today up to 2400′. As the water moves into the snowpack it break bonds, adds load and can lubricate weak layers and/or run along crusts, causing large wet slab avalanches. We know we have existing weak layers and crusts buried in the snowpack. Rain may also initiate large wet loose avalanches that could trigger the wet slabs. It is best to visualize the snowpack that has been affected by rain has now turned into a giant, scary slurpee that is out to get you. Avalanches were observed in many paths on Seattle Ridge yesterday and in channeled terrain along the Seward highway. Some of these avalanches were running to the valley bottom. This is very good reason to avoid travel in runout zones. Travel in the mountains is not recommended today.
Debris in an avalanche path off of Seattle Ridge.
Fresh debris overrunning old debris in one of the Petersen slide paths.
At higher elevations the precipitation is falling as snow and there were strong winds in the last 24 hrs. Large storm slabs may have developed in the Alpine depending on how well the new snow bonded to the layer below. Leeward slopes may be very loaded and cornices may be large and tender today.
The additional load, either from rain or snow combined with high winds, will be stressing the persistent weak layers of snow we know exist in the snowpack. We have two layers of buried surface hoar, a variety of facet/crust combinations and weak faceted at the ground. Avalanches initiating in the upper snowpack may step down to these layers and cause large, deep, dangerous avalanches.
Snowpack near the skier triggered avalanche that occured on Eddies Monday. Click HERE for full observation.
Eddies avalanche from below.
Yesterday skies were obscured and rain fell throughout the day. Rain/snowline was observed as high as 3000′ and may have gone higher. Around 2″ of rain fell across the region. Temperatures were in the 40Fs at sea level and 30Fs to high 20Fs at ridgetops. Winds were easterly 20-30 mph gusting as high as 70 mph on Sunburst.
Today should see cloudy skies and continued rain and snow during the day tapering off in the evening. Rain/snowline is forecasted to be around 2400′. Temperatures will cool down this evening with lows in the 20Fs tonight. Winds will be easterly 25-35 mph with gusts into the 40s today and be light overnight.
Tomorrow looks to be clear and sunny with temperatures in the 20Fs and light westerly winds. Cooler temperatures and partly cloudy skies are forecasted for the weekend.
*Alyeska Mid stopped recording data at 6pm last night. Alyeska top of quad (2800′) weather station received 1.9″ of water in the last 24 hrs.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||33||1||2||57|
|Summit Lake (1400′)||34||0||.4||15|
|Alyeska Mid (1700′)||*34||*0||*1.4||*45|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||31||SE||25||63|
|01/22/20||Turnagain||Observation: Sunburst||Adrian Beebee|
|01/22/20||Turnagain||Observation: Sunburst||Ryan Van Luit Forecaster|
|01/22/20||Turnagain||Observation: Seattle Ridge||W Wagner Forecaster|
|01/22/20||Turnagain||Observation: Tincan||Allen Dahl|
|01/21/20||Turnagain||Observation: Tincan||Eric Roberts|
|01/20/20||Turnagain||Observation: Eddies||H. Thamm B. Edwards|
|01/20/20||Turnagain||Observation: Eddies||Andy Moderow|
|01/19/20||Turnagain||Avalanche: south facing aspect on 3800ft bump just northeast of 4940||Anonymous|
|01/19/20||Turnagain||Avalanche: Cornbiscuit & Magnum||Allen Dahl|
|01/19/20||Turnagain||Observation: Eddie’s||Kakiko Ramos-Leon|
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|
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.