Turnagain Pass Avalanche Forecast RSS

Archives
ARCHIVED FORECAST - All forecasts expire after 24 hours from the posting date/time.
Issued
Fri, March 15th, 2013 - 7:00AM
Expires
Sat, March 16th, 2013 - 7:00AM
Forecaster
John Fitzgerald
Avalanche risk The Bottom Line

The avalanche hazard is generally LOW today.   The hazard is MODERATE in areas above treeline where snowmachine and skier triggered avalanches are possible.   Storm snow issues in the form of wind slabs and loose snow avalanches are the main concerns in the higher elevations.   Cornices are also a threat in the mountains today.

Thanks to our sponsors!
Fri, March 15th, 2013
Alpine
Above 2,500'
Moderate (2)
Avalanche risk
Treeline
1,000'-2,500'
Low (1)
Avalanche risk
Below Treeline
Below 1,000'
Low (1)
Avalanche risk
Alpine
Above 2,500'
Avalanche risk
Moderate (2)
Treeline
1,000'-2,500'
Avalanche risk
Low (1)
Below Treeline
Below 1,000'
Avalanche risk
Low (1)
Danger Scale:
No Rating (0)
Low (1)
Moderate (2)
Considerable (3)
High (4)
Extreme (5)
Avalanche Problem 1
  • Wind Slabs
    Wind Slabs
Wind Slabs
Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.
More info at Avalanche.org

It is always good to remember what happened in the past.  Three nights of calm, clear and cold weather earlier this week helped to form weak snow (surface hoar and facets) at the surface.  That weak snow is now blanketed with a fresh coat of paint, and that paint will be easy to peel off today, especially above treeline.  Wind slabs will be easiest to trigger today in upper elevation starting zones.  These newly formed slabs are sitting on a variety of weak interfaces, including surface hoar on the northern half of the compass and weak faceted snow on the southern half.  Look for these slabs to be in the 12″ range and be very sensitive to the weight of a person or sled.  Slabs unaffected by wind will also be something to look out for and will be smaller, in the 6-8″ range.  Today will be a good day to ratchet back your terrain choices, as those big lines that got hit on the last clear day now have the perfect slab/weak layer combination for avalanche activity.

Avalanche Problem 2
  • Dry Loose
    Dry Loose
Dry Loose
Dry Loose avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.
More info at Avalanche.org

This last batch of moisture that refreshed the snow surface ended with very light winds.  This should make for excellent riding and skiing conditions but also make loose snow avalanches a problem to deal with.  Volume should be in the low to moderate range and should be fast moving on steep shaded slopes in the higher elevations.  Sun and warming will create the possibility of sluffs to be more damp on sunlit aspects through the day.  Pay attention to loose snow moving downhill with you and move away from it, especially above terrain traps such as cliff bands, gullies and trees.

Additional Concern
Cornices
We have seen several very large cornices drop in the past few weeks.  This problem is pretty simple to deal with; minimize your time near and especially below cornices, as they have the potential to do a lot of damage as evidenced last week in the Goldpan area on Turnagain Pass.

Weather
Fri, March 15th, 2013

In the past 24 hours the mountains around Turnagain Pass have picked up 6″ of new snow/.4″ of water with lesser amounts in the Girdwood Valley and south towards Summit Lake.   Winds at the Sunburst station at 3,880′ have averaged 13mph out of the East with gusts to 45mph.   Temperatures have remained cool with sea level stations staying in the mid 20s F and ridgetops in the teens.

Today expect periods of clear skies as we are between two weak low pressure systems.   No precipitation is forecasted.   Winds will be very light out of the East at 5mph and temperatures will be in the high 20s F at 1,000′.

The extended outlook calls for a mix of sun and clouds over the next several days with no precipitation expected.

_________________________________________________________________________________________

Kevin will issue the next advisory tomorrow morning, March 16th.

Observations
Recent Observations for Turnagain Pass
Date Region Location
04/13/21 Turnagain Observation: Turnagain Pass Road Obs
04/12/21 Turnagain Observation: Tincan
04/10/21 Turnagain Observation: north sides
04/09/21 Turnagain Observation: Girdwood to Turnagain Road Observations
04/05/21 Turnagain Avalanche: Resort bowl Seattle creek head wall
04/04/21 Turnagain Observation: Center Ridge
04/03/21 Turnagain Observation: Repeat Offender – Seattle Ridge
04/02/21 Turnagain Observation: Seattle Ridge
04/01/21 Turnagain Observation: Pete’s
03/31/21 Turnagain Observation: Tincan
Riding Areas
Updated Thu, April 01st, 2021

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: mailroom_r10_chugach@fs.fed.us

Area Status Weather & Riding Conditions
Glacier District
Johnson Pass
Open
No parking in turnaround at end of the road near the outhouse.
Placer River
Open
Please do not ride along Railroad tracks. Cross tracks at 90 degree angle and clear the right of way.
Skookum Drainage
Closed
The Skookum Valley is closed to snowmachines. This closure occurs annually on April 1 as per the CNF Forest Plan.
Turnagain Pass
Open
Twentymile
Open
Please do not ride along Railroad tracks. Cross tracks at 90 degree angle and clear the right of way.
Seward District
Carter Lake
Open
Lost Lake Trail
Open
Primrose Trail
Open
Resurrection Pass Trail
Closed
Closed for the 2020/21 winter season.
Snug Harbor
Open
South Fork Snow River Corridor
Open
Summit Lake
Open

Subscribe to Turnagain Pass
Avalanche Forecast by Email

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.