|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|
Welcome to winter… ish. It’s currently 40F in Girdwood this morning. After two days of stormy weather precipitation is forecast to decrease today but easterly winds will remain fairly strong. Storm snow avalanches, including wind slabs along ridgelines, storm slabs in the sheltered zones, cornice falls and wet loose snow sluffs where rain is falling, should all be viewed as likely today. It’s a day to carefully evaluate terrain and consequences if an avalanche does release. The mountains need time to adjust.
Red flags to watch for:
– Recent avalanches – Are avalanches occurring today? Was there avalanche activity during the storm?
– Whumpfing (collapsing) of the snowpack
– Shooting cracks, likely to be seen near ridgelines where the wind has formed wind slabs.
Storm totals (beginning Wednesday through 6am Friday):
Turnagain Pass at 1,880′: 1.9″– of water equivalent, roughly 1.5-2′ of snow above treeline
Girdwood Valley at 1,700′: 3.6″ of water equivalent, roughly 2.5-3.5′ above treeline
Portage Valley at sea level: 5.3″ of water equivalent, roughly 5′ of snow above treeline
Summit Lake at 1,400′: 1.2″ of water equivalent, roughly 1′ of snow above treeline.
It is early in the season and overall we have limited snowpack data, especially in the Alpine (above 2500′) where most of the snow fell. What we do know is that the existing snowpack just got a heavy load. The storm was upside down with heavier snow falling on lighter snow or rain falling on snow. The winds were sustained and strong. Caution is advised. There is a long winter ahead. Don’t let early season stoke get the best of you!
Yesterday: Rain and snow fell throughout the day with snow line increasing to approximately 2200′ as temperatures rose well above freezing at lower elevations. In the past 24 hrs Girdwood received 1.5″ of water, Turnagain Pass 0.9″, and Portage (Bear Valley) 3.4″ with upper elevations seeing snow. Easterly winds were in the 30s with gusts into the 60s. Overnight temperatures were in the 40Fs at sea level, 30Fs at mid elevations and 20Fs at ridgetops.
Today: Rain and snow showers will continue today with snow line forecast to be around 2400′, 0.3 inches of water and 0-6″ of snow. Temperatures will be in the low 40Fs at sea level and the high 20Fs along ridgetops. Winds are forecast to be easterly 15-35 mph with gusts into the 50s. Overnight temperatures should cool a bit and rain/snow showers will continue with snow line dropping to 1500′. Winds will remain easterly gusting into the 40s.
Tomorrow: Cloudy skies with rain and snow showers and daytime temperatures just slightly cooler than today. Easterly winds will decrease to 5-10 mph. The pattern looks to remain active into next week with an overall cooling trend.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||35||1||0.9||15|
|Summit Lake (1400′)||34||0||0.3||8|
|Alyeska Mid (1700′)||33||5||1.44||20|
RIDGETOP 24-hour data (6am – 6am)
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||NA*||SE*||15*||35*|
*Seattle Ridge is not recording temperature and wind stopped recording at 10 pm.
|01/13/21||Turnagain||Observation: Tincan||Johnston-Bloom / Moderow Forecaster|
|01/13/21||Turnagain||Observation: Center Ridge Meadows||Alaska Avalanche School Rec Level 1 Roberts|
|01/12/21||Turnagain||Avalanche: Seattle Ridge/Center Ridge||A Schauer Forecaster|
|01/11/21||Turnagain||Observation: Tincan Trees||Schauer/ Roberts Forecaster|
|01/10/21||Turnagain||Observation: Center Ridge Meadows||Alaska Avalanche School Pro 1 Course Latosuo|
|01/10/21||Turnagain||Avalanche: Tincan trees||Anonymous|
|01/09/21||Turnagain||Observation: Johnson Pass||Anonymous|
|01/08/21||Turnagain||Observation: Sunburst meadow between Hemlocks||Anonymous|
|01/08/21||Turnagain||Avalanche: Seattle Ridge||Wagner / Schauer|
|01/07/21||Turnagain||Observation: Lower Cornbiscut||Alaska Avalanche School Pro 1|
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: email@example.com
|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.