Saturday, January 3rd 2015 5:49 am by John Fitzgerald
ARCHIVED ADVISORY - All advisories expire after 24 hours from the posting date/time.
The avalanche danger is MODERATE on steep slopes in the alpine today. Dense slabs up to 3’ in depth, if triggered, have the potential to injure or bury a person. Pockets of old wind slab, 8-10” in depth also have the potential to knock a person off their feet and could be triggered in very steep upper elevation terrain.
At treeline the avalanche danger is LOW, where mostly stable snow exists. Keep in mind that LOW does not mean NO. Utilize good travel habits when entering avalanche terrain.
|Show the Complete North American Avalanche Danger Scale|
|Travel Advice: Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.|
|Travel Advice: Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.|
The CNFAIC Avalanche Rescue Workshop scheduled for January 4th has been postponed due to minimal snow coverage at the parking lot level in Turnagain Pass. The workshop has been rescheduled for January 18th. Check our calendar for up to date info.
Dense slabs are spread across the forecast zone. These slabs are strong and can support a lot of weight. Underlying these slabs are a variety of weak layers. The most widespread of these layers is buried surface hoar, roughly 2’ down and found above 2,500’. We currently have a snowpack structure that shows some potential for slab avalanches.
On the plus side the strength of the slab in most areas is high, making it difficult to trigger an avalanche. Time and settling has allowed the buried weak layers to adjust to the slabs resting over them. While the likelihood of triggering an avalanche is on the low end of the scale, our tests continue to show us that propagation is still possible across slopes.
The best way to stay out of trouble today is to avoid suspected trigger points. These points are found on steep (>40 degree) rollovers and in areas where the snow is shallow. It is in these areas where it is easier for a person or group to impact the weak layer.
Dense wind slabs formed over the early part of this past week. These slabs (4-10" thick) are generally well bonded to the surfaces below. However, it is worth keeping an eye out for the occasional pocket of stiff old wind slab, especially in very steep terrain. Jumping on steep rollovers on small test slopes is the best way to assess this avalanche concern. If venturing into more committing terrain, have an escape route in mind before moving over these slabs and be ready to ski or ride off of them.
With navigating around both of these avalanche concerns, continue to practice good travel habits. In steep terrain expose only one person at a time. Use islands of safety for re grouping. Have escape routes planned should an avalanche occur. Have a plan and communicate well within your group. Be mindful of and minimize exposure to groups below you.
Yesterday brought clear skies and more winter like temperatures to the area. Ridgetop winds were light out of the East/Northeast. Temps were in the teens to low 20s F. No new precipitation was recorded.
Today expect clouds and the occasional flurry this morning to give way to clear skies by the end of the day. Winds will be light out of the North at 5-10 mph. Temperatures will be on the decline, averaging in the 20s F at ridgetop level and dipping into the single digits F tonight.
High pressure will take hold over mainland Alaska for the next several days. This weather pattern will bring clear skies, cold temps and no precipitation.
PRECIPITATION 24-hour data (6am - 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880')||22||0||0||34|
|Summit Lake (1400')||16||0||0||7|
|Alyeska Mid (1700')||23||0||0||25|
RIDGETOP 24-hour data (6am - 6am)
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
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).
Riding status is not associated with avalanche danger. An area will be open to motorized use in accordance to the Forest Management Plan when snow coverage is adequate to protect underlying vegetation. Backcountry hazards including avalanche hazard are always present regardless of the open status of motorized use areas.
(Updated: Jan 13, 2019 )
|AREA||STATUS||WEATHER AND RIDING CONDITIONS|
|Twentymile:||Closed||Closed. Forest Service is monitoring conditions.|
|Lost Lake Trail:||Open||Please stay on trail to avoid resource damage through forested areas.|
|Primrose Trail:||Open||Please stay on trail to avoid resource damage through forested areas.|
|Resurrection Pass Trail:||Closed||Closed for the 2018/19 season. Next season will be open to motorized use.|
|South Fork Snow River Corridor:||Open|
SNOW AND AVALANCHE HOTLINE (907) 754-2369
If you have comments or questions regarding CNFAIC operations or winter recreation management, please email firstname.lastname@example.org
© 2019 Chugach National Forest Avalanche Information Center. All rights reserved.