Yesterday natural avalanches 2 ft. deep were observed. These were long running and large enough to bury and kill a person. Cracking and collapsing (whumpfing) were also observed.
Red flags… Rapid loading = Expect dangerous avalanches.
STORM TOTALS in the upper elevations so far:
Turnagain Pass: 30+” and counting, 2.8″ of H2O
Girdwood Valley: 20+” and counting, 1.6″ of H2O
Summit Lake: 4-6″, .4″ of H2O
Snow continues to fall with another 1-4″ inches expected today. 16″- 20″ of snow was measured yesterday on Turngagain Pass. An additional 10+ inches has fallen since then. All of this new snow is forming thick slabs, especially in the alpine where consistent easterly winds have been blowing into the 40’s. The weak surface snow and weak snowpack have been rapidly loaded. Expect natural avalanches today and that triggering an avalanche is very likely on any slopes over 30 degrees. Avalanches have the potential to be long running and could be remotely triggered. Avoid travel underneath avalanche terrain as well. This includes the Seattle Ridge up-track and all slopes, gullies and runout zones.
This needs to be highlighted again today:
Treed areas such as the Tincan Trees: Storm snow slab avalanches 2-3′ thick are likely to be triggered in the trees. The new snow is denser than the underlying old snow – creating an upside down and unstable snowpack. Avoiding slopes over 30 degrees in treed areas is also recommended. Due to the weak faceted snow below the new snow the snowpack is “bottomless”. Movement through the snow was challenging yesterday and will only be more of a struggle today.
Travel in avalanche terrain is NOT recommended. Deep, dangerous avalanches are likely. BE PATIENT.
Natural avalanche in the Snake Pit on Tincan, 12.25.16. The next gully over also slid.
Yesterday skies were obscured and it snowed or rained depending on elevation throughout the day with periods of heavy precipitation. Easterly winds were in 20s gusting into the 40s. Temperatures were in the 20Fs at ridge tops and in 30s in the valleys. Rain/snowline fluctuated around 500′. The storm continued overnight and temperatures are rising slightly this am.
Today will be cloudy and another 1-4″ of snow is forecasted to fall, rain below 400′. Temperatures are forecasted to hover around freezing, either above or below depending on elevation. Winds will remain easterly 5-15 mph with higher gusts in the alpine. The snow showers are forecasted to continue overnight into tomorrow with temperatures cooling and winds becoming calm.
Tomorrow is forecasted to be cloudy with a slight chance of snow showers, temperatures in the low 20Fs and light NW winds.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||29||20||2||50 + (estimate)|
|Summit Lake (1400′)||31||2||.2||10|
|Alyeska Mid (1700′)||31||10||.9||32|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Sunburst (3812′)||Under repair||Under repair||Under repair||Under repair|
|Seattle Ridge (2400′)||24||rimed||rimed||rimed|
|01/19/20||Turnagain||Avalanche: south facing aspect on 3800ft bump just northeast of 4940||Anonymous|
|01/19/20||Turnagain||Avalanche: Cornbiscuit & Magnum||Allen Dahl|
|01/19/20||Turnagain||Observation: Eddie’s||Kakiko Ramos-Leon|
|01/18/20||Turnagain||Observation: Sunburst||Ryan Van Luit Forecaster|
|01/18/20||Turnagain||Avalanche: Sunburst||Eric Roberts|
|01/18/20||Turnagain||Avalanche: North end Tincan trees||Heather Johnson|
|01/17/20||Turnagain||Observation: Tincan||Allen Dahl|
|01/16/20||Turnagain||Observation: Lynx Creek||Wagner / Van Luit Forecaster|
|01/13/20||Turnagain||Observation: Tincan||Ryan Van Luit Forecaster|
|01/12/20||Turnagain||Observation: Magnum West face||Levi Oyster|
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: firstname.lastname@example.org
|Area||Status||Weather & Riding Conditions|
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.