Turnagain Pass
|
![]() ![]() |
The avalanche danger is CONSIDERABLE above 1,000′ due to a short period of heavy snowfall and strong winds occurring this morning. Wind slab avalanches, up to 2′ deep, will be likely to trigger on any slope with recent wind loading and natural wind slabs are possible. Shallow soft slab avalanches could be triggered on slopes out of the wind seeing over 8″ of new snow from overnight. A cautious mindset is recommend if traveling into the backcountry.
The danger is MODERATE below 1,000′ where small wet snow avalanches could occur or debris from a slide above could run.
SUMMIT LAKE / SEWARD / LOST LAKE: Increased avalanche conditions could exit in these areas due to strong winds and a short burst of intense precipitation this morning. Extra caution is advised.
AK DOT & PF: There will be intermittent traffic delays for avalanche hazard reduction today on the Portage Glacier Highway near Mile Post 5 and Bear Valley from 10:00 am to 12:00 noon. Motorists should expect delays of 45 minutes. Updates will be posted on the 511 system.
![]() |
![]() |
![]() |
![]() |
![]() |
|
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. |
A remotely triggered avalanche was reported in Girdwood Valley in the Notch Mtn area around 2,500′ on a SW aspect. The avalanche was witnessed by another group in the area. It was ~3′ deep and unknown how wide or far it ran due the view being obscured.
Otherwise, that last known avalanche was a natural avalanche cycle that occurred during heavy snowfall and strong winds early on New Year’s and morning.
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 |
The active weather continues. Starting around midnight, snowfall intensity picked up (above 1,000′, rain below) and winds have really picked up. As of 6am 8-12″ of new snow has fallen at Turnagain Pass, 4-8″ in Girdwood Valley, and 3-4″ at Summit Lake. Easterly ridgetop winds have been 30-40mph with gusts as high as 74mph on Max’s Mtn. Both precipitation intensity and winds should be on the decline through the day. However, avalanches will still be prime for people to trigger in the new storm snow. Remember, watching for any recent avalanche activity will be a good place to start when evaluating our Red Flags (recent avalanches, cracking or collapsing in the snow, heavy snowfall and strong winds).
Wind slab avalanches are likely to be found and triggered on slopes that have seen, or are still seeing, active wind loading. Depending on how good the visibility is today, it could be hard to see these signs of wind loading. Be sure to always feel for stiffer snow over softer snow and any cracks that shoot out from you.
Along ridgelines, cornices could be teetering on the brink of failure. They have grown significantly since the holiday storms and could look much different. This is something to watch for as the skies clear and it’s much easier to travel along ridges.
Shallow soft slab avalanches, composed of the new snow, could be an issue anywhere over 8″ of snow falls. Stick your hand in the snow now and then to see how much new snow has fallen. If you are in area that got over 8″ of snow overnight, that new snow may not have bonded yet to the old surface and could slide easily.
Moderate winds along the lower Sunburst Ridge were taking minutes to fill tracks back in. Stronger winds were noted at the higher elevations. 1.3.23.
Click here to view the video below if it doesn’t load in your browser.
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 |
Buried under this morning’s storm snow, the New Year’s snow, and the Xmas snow, are various layers of weaker faceted snow. These are the December facets that formed mid-December, and the facets surrounding the Thanksgiving crust. They are anywhere from 3-5′ deep. Could one of these layers be responsible for the Notch Mtn avalanche? Possibly. We’ll try and find out. For now, we all need to be aware there could be larger avalanches under just the storm snow issues. Another reason to be extra cautious.
As more snow falls, these layers are getting deeper and deeper and are also become more compressed. These two things really help them adjust and heal. It also begins the transition into a Deep Persistent Slab problem in the event they are not completely healed – something we are currently evaluating.
Snowpit tests at this site produced no signs of reactive buried weak layers. However, this area sees a lot of traffic. As skies clear and travel to other areas becomes easier, weak layers could turn out to be more reactive. 1.3.23.
Yesterday: Light snow showers and mostly overcast to obscured skies were over the region yesterday. Only a trace to an inch of new snow was reported. Ridgetop winds were easterly in the 15-25mph range with gusts near 40mph. Temperatures were mild, in the upper 30’sF at sea level and in the high 20’sF along ridgelines.
Today: A pulse of moisture is over the region this morning bringing snowfall above 1,000′ and rain below. There has been around 10″ of new snow at Turnagain with lesser amounts in Girdwood Valley and Summit Lake. Another 3-5″ is expected through the day. Ridgetop winds are currently 20-40mph with gusts in the 70’s. Winds and precip should slow through the day as temperatures cool (bringing the snow line down to ~500′).
Tomorrow: A break in stormy weather is expected to begin tomorrow with some clearing skies and extend into Friday; and possible into the weekend. Ridgetop winds should also take a break and look to be light from an easterly direction. Temperatures will be on a cooling trend, into the teens and 20’sF.
PRECIPITATION 24-hour data (6am – 6am)
Temp Avg (F) | Snow (in) | Water (in) | Snow Depth (in) | |
---|---|---|---|---|
Center Ridge (1880′) | 31 | 8-10 | 1 | 64-66 |
Summit Lake (1400′) | 31 | 4 | 0.4 | 34 |
Alyeska Mid (1700′) | 32 | 3 | 0.3 | 46 |
Bear Valley – Portage (132′) | 36 | rain | 0.75 | – |
RIDGETOP 24-hour data (6am – 6am)
Temp Avg (F) | Wind Dir | Wind Avg (mph) | Wind Gust (mph) | |
---|---|---|---|---|
Sunburst (3812′) | 22 | NE | 25 | 44 |
Seattle Ridge (2400′) | 26 | N/A* | N/A* | N/A* |
*Seattle Ridge anemometer is rimed up and not reporting.
Date | Region | Location | Observer |
---|---|---|---|
10/27/24 | Turnagain | Observation: Tincan | Michael Kerst |
10/21/24 | Turnagain | Observation: Turnagain Pass Road Observation | Trevor Clayton |
10/19/24 | Turnagain | Observation: Tincan – Below Todds Run | Andy Moderow |
10/18/24 | Turnagain | Observation: Taylor Pass | Eli Neuffer |
10/15/24 | Turnagain | Observation: Tincan Common | John Sykes Forecaster |
10/14/24 | Turnagain | Avalanche: Tincan | CNFAC Staff |
05/13/24 | Turnagain | Observation: Eddie’s, Sunburst, Seattle, Cornbiscuit, Pete’s South | H Thamm |
05/13/24 | Turnagain | Observation: Turnagain Pass non-motorized side | Amy Holman |
05/12/24 | Turnagain | Observation: Warm up Bowl | Tony Naciuk |
05/07/24 | Turnagain | Observation: Turnagain Pass Wet Slabs | A S |
The riding areas page has moved. Please click here & update your bookmarks.
Subscribe to Turnagain Pass
Avalanche Forecast by Email