|Signal Word||Size (D scale)||Simple Descriptor|
|Small||1||Unlikely to bury a person|
|Large||2||Can bury a person|
|Very Large||3||Can destroy a house|
|Historic||4 & 5||Can destroy part or all of a village|
An intense period of snowfall and high winds is currently impacting the forecast area, with the biggest pulse of snow accumulation taking place in the early morning hours today. This storm is following a similar pattern to what we have seen over the past several days of warm and wet weather, with significantly higher amounts of precipitation in coastal areas and favoring the Girdwood valley over Turnagain Pass. Snow totals from Sunday afternoon through Monday evening should be over 24″ in Portage and Placer, 12 to 24″ for Girdwood, and closer to 8 to 16″ for Turnagain pass. Snow line is forecast to be between 500 to 1000′ today, rising throughout the day. In addition to the snowfall, winds have been averaging over 50 mph since 1 am on Sunburst with gusts up to 90 mph. Continued strong winds throughout the day today will be transporting snow at mid and upper elevations.
Travel in avalanche terrain is not recommended. Large avalanches releasing in the upper elevations could run into lower elevations, so be aware of overhead hazards if you are travelling in avalanche paths in the treeline or below treeline elevation band today.
Wind slabs 1-4+’ deep will be very likely for a person to trigger and likely for natural release in areas that are seeing active wind loading from the strong SE winds. In protected areas the new load of storm snow could also cause avalanches up to 2′ deep, depending on how well the new snow bonds with the existing snow surface. Since the peak precipitation amounts are happening just before daylight the storm snow will likely be touchy during the first half of the day as it needs some time to bond with the underlying surface. The heavy new load of snow could also reactivate buried weak layers, such as the facets over the New Years crust, which could cause very large avalanches on specific terrain features.
Cornices: The new snow and strong winds will be rapidly building cornices today which could release spontaneously or be reactive to human triggering.
Yesterday: Warm and wet weather with active snow and rain starting around noon in Turnagain Pass and increasing in intensity throughout the day. Moderate winds during the daylight hours which bumped up to strong winds with very strong gusts after midnight, especially at upper elevations. Temperatures stayed above freezing at lower elevations with snow rain line around 1000′.
Today: Heavy snow and rain accompanied by strong winds during the early morning hours tapering off towards noon. Snow totals including Sunday afternoon and evening are forecast to be in the 1-2+ foot range, with Turnagain Pass on the lower end and more coastal areas like Portage and Placer on the higher end. Snow line should be around 500′ early Monday morning rising to 1000′ in the afternoon. Winds remain strong out of the SE during the morning with averages in the 25-50 range at and gusts possible up to 100 mph. During the afternoon winds will lighten up slightly and shift to the south.
Tomorrow: After a period of lighter precipitation during the day Monday another pulse of snow and rain is coming overnight with potential for additional 3-9″ of snowfall. Temperatures should drop early Tuesday morning and be below freezing down to sea level. Winds are forecast to be out of the south for this next pulse of moisture in the 10-30 mph range. During the day Tuesday skies look to start clearing and winds become light and variable before the next low pressure system enters the area Wednesday around midnight.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||33||6||0.6||83|
|Summit Lake (1400′)||32||3||0.2||32|
|Alyeska Mid (1700′)||32||12||1.1||80|
RIDGETOP 24-hour data (6am – 6am)
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||26||SE||17||41|
|05/11/22||Turnagain||Avalanche: Cornbiscuit and Magnum west faces||CNFAIC Staff Forecaster|
|05/07/22||Turnagain||Observation: Granddaddy||Kit Barton|
|04/29/22||Turnagain||Observation: Sunburst wx station||AS/ MM/ AM/ NH|
|04/28/22||Turnagain||Observation: More Turnagain Pass/Summit Lake wet slab activity||Alex Marienthal|
|04/27/22||Turnagain||Observation: Magnum||Sykes / Buttrick Forecaster|
|04/27/22||Turnagain||Observation: Girdwood/Summit/Turnagain Road obs||A S|
|04/24/22||Turnagain||Avalanche: Seattle Ridge – large glide avalanche on Repeat Offender path||CNFAIC Staff Forecaster|
|04/24/22||Turnagain||Avalanche: Seattle Ridge uptrack||Martin Schmidt|
|04/24/22||Turnagain||Observation: Pastoral||Jason Konigsberg|
|04/24/22||Turnagain||Observation: Sunburst||Lance breeding|
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.