Today up to 5” of new snow combined with moderate winds (20-30mph) from the Northeast could form isolated wind slabs up to 8″ thick on leeward terrain features. On shaded features in the Alpine (where a surface crust doesn’t exist) these wind slabs could stress the most recent storm slab up to 2’ thick. At lower elevations these wind slabs will be forming on a surface crust and could be tender.
Wind slab thickness will depend on how much snow falls today. A large low-pressure system is expected to push into our region this evening. Winds are likely to increase into the 40s mph and an additional 8” of snow is expected this evening. Should this storm arrive earlier then expected the avalanche danger could increase to CONSIDERABLE by early evening.
Careful snowpack and terrain evaluation are required for every group traveling in the mountains. If you find that the snowfall intensity and strong winds are causing rapid loading, keep your slope angles below 35° and avoid large open slopes.
Deeper Persistent Layers:
There are several old weak layers burried deep within our snowpack. Today’s moderate winds and new snow will likely make visibility challenging. Should a window apear making steeper more extreme terrain appealing, condsider that we don’t have a lot of current info about these layers. It has been 6 days since activity has been observed in these deeper layers, but it is uncertain how much additional loading + the right trigger will re-awaken them.
Springtime requires us to pay close attention to how the snow changes throughout the day. We have seen intense solar affect almost every day. This is a reminder that our current snowpack can change dramatically from the morning into the afternoon. Although sun isn’t supposed to be an issue today, it has suprised us over the last few weeks and subtle warming affects are playing more of a role than noticed.
As this storm moves into our area expect rain/snow line to start moving up in elevation and could be as high as 1500’ by Saturday morning. Should the lower elevation snow become wet and saturated wet loose avalanches will be possible.
Turnagain Pass looks more like winter than it has most of the season. The Forest Service is closely monitoring the snow depths and snow density on the motorized side of the road for a potential motorized opening. There isn’t quite enough coverage yet to protect the vegetation below, but check back here should this next storm come in cold.
Yesterday cloud cover in the morning was thick and in the afternoon skies became partly sunny at times. Scattered snow and rain showers were observed throughout the day with little to no accumulation. Temperatures were between 30-40F at lower elevations and averaged in the mid 20s F along ridgetops. Winds were calm in the morning increasing to 15-20 mph from the Northeast in the afternoon.
Overnight temps at lower elevations dipped just below freezing and only a trace of precipitation was recorded. Winds were moderate 15-25mph from the Northeast along ridgetops.
Showery rain and snow conditions are expected throughout today. Winds will increase in the afternoon as a large low-pressure system arrives tonight bringing rain and strong winds. Rain/snow line may be as high as 1500′ by Saturday.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||34||0||0||75|
|Summit Lake (1400′)||34||0||0||12|
|Alyeska Mid (1700′)||34||2||.19||43|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||26||n/a||17||31|
|04/21/21||Turnagain||Observation: Sunburst||Schauer/ Behney Forecaster|
|04/19/21||Turnagain||Avalanche: Triangle, Seattle creek||Will Morrison|
|04/18/21||Turnagain||Avalanche: Turnagain Pass Road Obs||Andy Moderow|
|04/18/21||Turnagain||Observation: Seattle Ridge, approximately 300 yards south of the up track||Brent Byrne|
|04/17/21||Turnagain||Avalanche: Road obs||Johnston-Bloom / Moderow Forecaster|
|04/16/21||Turnagain||Avalanche: Seattle Ridge||Wendy Wagner Forecaster|
|04/16/21||Turnagain||Avalanche: Turnagain Pass, non-motorized side seen from Seattle Ridge||CNFAIC Staff Forecaster|
|04/16/21||Turnagain||Observation: Sunburst||Lance breeding|
|04/15/21||Turnagain||Observation: Tincan||Schauer/ Rothman Forecaster|
|04/13/21||Turnagain||Observation: Turnagain Pass Road Obs||A Schauer Forecaster|
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.