Turnagain Pass Avalanche Forecast RSS

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ARCHIVED FORECAST - All forecasts expire after 24 hours from the posting date/time.
Issued
Fri, April 25th, 2014 - 7:00AM
Expires
Sat, April 26th, 2014 - 7:00AM
Forecaster
Wendy Wagner
Avalanche risk The Bottom Line

The avalanche danger is LOW this morning and expected to rise to MODERATE above treeline this evening as strong winds coupled with up to 4 € of snow is expected by midnight. In the event you find yourself in the upper alpine terrain with new snow, watch for loose snow sluffs and shallow wind slabs in the 6-8 € thick range. Below treeline the avalanche danger will remain LOW where ~2″ of snow is expected with rain below 1500ft.

Special Announcements
  • Join us tomorrow afternoon – rain or shine – for the  2014 Corn Harvest  at the Turnagain Pass Center Ridge parking lot!! Come by for free food, games and fun.  More details  HERE.
  • Turnagain Pass is now  CLOSED  to motorized use  due to low snow cover.  Snug Harbor road is the only area in Chugach National Forest open to motorized use.
  • This is the final week of advisories.   The last forecast will be issued Sunday, April 27th.
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Fri, April 25th, 2014
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

After a long stretch of clear skies, sunscreen and quiet avalanche conditions, we are getting back into a somewhat stormy weather pattern. The Easterly winds already picked up along the ridgelines yesterday and there is snow above 1500ft on tap for the next several days.

As we head back into winter at the upper elevations we can put loose snow sluffs and wind slabs back on our radar. Snow is expected to fall in earnest this afternoon and although amounts are uncertain, as is often the case, we could see up to 4” by sunset (~9:45pm). Favored areas such as Portage Valley could see 5-7”. This will be falling on old stout surface crusts.

Wind slab avalanches should be expected on any slope with recent wind deposited snow. Considering there is very little pre-existing snow available to transport, it will depend on new snow amounts as to wind slab formation and size. With modest amounts expected the avalanche activity should be fairly low in volume, predictable and easy to suss out.

 

A look at the pre-existing surface from the Sunburst parking               A look at this morning’s weather conditions (Tincan Ridge from 
lot yesterday.                                                                                  the DOT Turnagain Pass webcams).
  

Weather
Fri, April 25th, 2014

Yesterday was another bluebird day on the Pass. Sunny skies gave way to a few cumulus clouds by the afternoon and temperatures climbed to the mid 30’s F on the peaks. The wind kicked up to the 20mph range from the East late in the day and has continued overnight associated with a small system moving through from the Gulf.

Today this smaller system continues to move North ahead of a large Aleutian Low tracking East with an associated front which will impact our region by the afternoon. There is a chance for .4 € of rain below 1500ft with 2-4 € of snow above from this afternoon through midnight. Winds will continue from the East in the 25-35mph range and temperatures look to stay in the mid 20’s F above treeline and 35-40F at 1000ft.

The front mentioned above is forecast to stall out over us for the weekend with 40-50mph Easterly winds and a decent shot of rain/snow can be expected (the rain/snow line should be around 1200ft). As for the CORN HARVEST tomorrow from 3-7pm €“ let’s hope we get a little break in the cloud cover and precipitation!

Observations
Recent Observations for Turnagain Pass
Date Region Location
05/21/22 Turnagain Avalanche: Magnum, Lipps and Tincan
05/17/22 Turnagain Avalanche: Sunburst
05/17/22 Turnagain Observation: Tincan Ridge
05/11/22 Turnagain Avalanche: Cornbiscuit and Magnum west faces
05/07/22 Turnagain Observation: Granddaddy
04/29/22 Turnagain Observation: Sunburst wx station
04/28/22 Turnagain Observation: More Turnagain Pass/Summit Lake wet slab activity
04/27/22 Turnagain Observation: Magnum
04/27/22 Turnagain Observation: Girdwood/Summit/Turnagain Road obs
04/24/22 Turnagain Avalanche: Seattle Ridge – large glide avalanche on Repeat Offender path
Riding Areas
Updated Fri, May 13th, 2022

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
Closed
Closed as of May 1 per Forest Plan.
Placer River
Closed
Closed as of April 25th due to insufficient snow coverage.
Skookum Drainage
Closed
Closed as of April 1st per Forest Plan.
Turnagain Pass
Open
Open. Extended opening through May 31.
Twentymile
Closed
Closed as of April 6th due to insufficient snow coverage.
Seward District
Carter Lake
Closed
Closed as of May 1 per Forest Plan.
Lost Lake Trail
Closed
Closed as of May 1 per Forest Plan.
Primrose Trail
Closed
Closed as of May 1 per Forest Plan.
Resurrection Pass Trail
Closed
Closed as of May 1 per Forest Plan.
Snug Harbor
Closed
Closed as of May 1 per Forest Plan.
South Fork Snow River Corridor
Closed
Closed as of May 1 per Forest Plan.
Summit Lake
Closed
Closed as of May 1 per Forest Plan.

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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.