Turnagain Pass RSS

Archives
ARCHIVED - Forecasts expire after 24 hours.
Issued
Thu, February 2nd, 2012 - 7:00AM
Expires
Fri, February 3rd, 2012 - 7:00AM
Forecaster
Wendy Wagner
Avalanche risk The Bottom Line

Good morning. This is Wendy Wagner with the Chugach National Forest Avalanche Information Center on Thursday, February 2nd at 7am. This will serve as 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).

ANNOUNCEMENT

Alaska DOT crews will be conducting avalanche hazard reduction along the Seward Highway today. Expect intermittent road closures between 10am and 3pm. Visit http: http://511.alaska.gov/ for updated information.

BOTTOM LINE

Pockets of HIGH avalanche danger remain in areas where strong winds and continued snowfall and/or rain persist in the wake of yesterday’s intense storm. In most areas this morning, winds and snowfall rates are tapering off and the danger is CONSIDERABLE. Though the storm, and avalanche danger, is decreasing, dangerous avalanche conditions still exist. Human triggered avalanches are likely on ALL SLOPES at ALL ELEVATIONS today and expert level route finding skills are required for safe backcountry travel.

AVALANCHE DISCUSSION

Heavy snowfall, rain and hurricane force winds pounded our region yesterday. The avalanche danger was updated to HIGH as the storm intensified mid-day. Natural avalanches occurred and, though driving conditions and visibility were very poor, debris piles were seen at the bottom of some avalanche paths. One of three paths at mile 106 on the Seward Highway slide and deposited snow on the road.

Storm snow instabilities are the primary concern today with continued moderate snowfall and strong ridgetop winds. These will be in the form of: Wind slabs, soft slabs and loose snow avalanches. Soft slabs were exceedingly touchy yesterday on slopes over 35 degrees in the relatively ‘safe’ treed locations. We were able to trigger these 10-16″ slabs at will on steep rollovers. This is indicative of how the snow is reacting and bonding to the old surface. Though this weakness has likely settled out to some degree today, new snow and continued wind will keep the hazard up.

Lower elevation slopes (below 1000′):

Wet avalanches are also a concern where rain has fallen on snow. Very heavy and wet snow exists at these elevations and, until cooler temperatures lock it in place, wet avalanches will be possible.

Safer places to recreate are in the flats, or on slopes less than 35 degrees, that are NOT below or connected to steeper slopes and avalanche paths.

MOUNTAIN WEATHER

Heavy snow and rain fell in force yesterday. Some areas saw over 3″ of snow per hour at times.

Totals from the mid elevations:

Turnagain Pass: 24-30″ snow, ~2″ water

Girdwood Valley: 28-36″ snow, 2.5-3″ water

Summit Late: 14″ snow, ~1″ water

Winds were off the charts as well. Not only did Sunburst’s wind sensor make it through 5 hours of over 100mph gusts intact, it recorded its new record gust – 126mph. Winds were southeast, sustained between 50-85mph. Needless to say, it was bona fide storm day.

Today, remnants of the storm still hang over us and we can expect moderate snowfall (around 6-10″ accumulating today) and moderate to strong ridgetop wind (southeast 30mph with 55mph gusts). The snow/rain line is currently right around sea level where temperatures are in the mid 30’s. Temperatures will be in the upper to mid 20’s F above 1000′ and should cool off tonight and into tomorrow.

CNFAIC Weather Page and the NWS forecast

Kevin will issue the next advisory Friday morning. If you get out in the backcountry we want to know what you are seeing. Please send us your observations using the button at the top of this page or give us a call at 754-2369. Thanks and have a great day.

Thu, February 2nd, 2012
Alpine
Above 2,500'
3 - Considerable
Avalanche risk
Treeline
1,000'-2,500'
3 - Considerable
Avalanche risk
Below Treeline
Below 1,000'
3 - Considerable
Avalanche risk
0 - No Rating
1 - Low
2 - Moderate
3 - Considerable
4 - High
5 - Extreme
Avalanche risk Avalanche risk Avalanche risk Avalanche risk Avalanche risk
Travel Advice Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features. Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern. Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding, and conservative decision-making essential. Very dangerous avalanche conditions. Travel in avalanche terrain not recommended. Extraordinarily dangerous avalanche conditions. Avoid all avalanche terrain.
Likelihood of Avalanches Natural and human-triggered avalanches unlikely. Natural avalanches unlikely; human-triggered avalanches possible. Natural avalanches possible; human-triggered avalanches likely. Natural avalanches likely; human-triggered avalanches very likely. Natural and human-triggered avalanches certain.
Avalanche Size and Distribution Small avalanches in isolated areas or extreme terrain. Small avalanches in specific areas; or large avalanches in isolated areas. Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas. Large avalanches in many areas; or very large avalanches in specific areas. Very large avalanches in many areas.
Observations
Recent Observations for Turnagain Pass
Date Region Location
02/25/24 Turnagain Observation: Kickstep NE Bowl
02/24/24 Turnagain Observation: TinCan Backdoor/ Center Ridge
02/22/24 Turnagain Avalanche: Lynx Creek
02/22/24 Turnagain Observation: Turnagain, Seattle, Mt Ascension
02/21/24 Turnagain Observation: Tincan Trees
02/21/24 Turnagain Observation: Sunburst
02/20/24 Turnagain Avalanche: Tincan
02/20/24 Turnagain Observation: Seward Highway across from Johnson Pass TH
02/19/24 Turnagain Avalanche: Base of Seattle Ridge
02/18/24 Turnagain Observation: Lynx creek
Riding Areas

The riding areas page has moved. Please click here & update your bookmarks.


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.