|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|
Yesterday’s quick moving and powerful storm brought feet of snow to the Alpine, inches of rain to sea level and 90mph winds to the ridgetops. The rain snow line bounced between 1,000′ and 1,500′ in most areas. Mostly wet snow and rain fell along Turnagain Pass and as of this morning, there is what looks to be an inch or two of snow surviving along the Pass. Rain and snowfall have decreased overnight but are on tap to pick up slightly again this evening.
Storm totals at the mid-elevation snow stations (beginning Thursday night to 6am this morning)
Widespread avalanche activity was seen yesterday. Debris piles were observed running into snow free zones below 1,000′ in Girdwood and Portage Valleys as well as Seward. Although natural activity will be expected to decrease today, the mountains are still in shock and large avalanches are still likely in many areas. With additional snowfall tonight, natural avalanche likelihood could increase again. That said, today is another day to avoid avalanche terrain all together.
Moose Mountain avalanches, outline of debris marked in orange. This is near MP 52 along the Seward Highway (Summit zone). Photo: Alex McLain
Upper Girdwood Valley, North side of Crow Creek Valley. Debris from avalanches above running to valley floor.
Seward’s Mt. Benson with several large debris piles from avalanche activity higher on the mountain. Photo: Jamie Lyons
Just enough snow to make it white along Turnagain Pass yesterday. This is Rookie Hill in the foreground looking at the base of Seattle Ridge, seen from the motorized parking lot. Photo: Will Brennen
Yesterday: Heavy rain below 1,000' and heavy snowfall above 1,500' - a wintery mix in between these elevations. Snow and water totals above and below. Winds were strong out of the East, averaging in the 60's mph with gusts into the 90's. Temperatures were in the upper 20's along the ridgetops and mid 30's at 1,000'.
Today: Rain and snowfall has decreased overnight. Scattered showers should be seen around the region today and could pick up slightly tonight. Between .2-.3" of rain below 1,000' is forecast with 2-4" of additional snow at the higher elevations today. Tonight snow line should lower and an additional 3-5" of snow could be seen near sea level by tomorrow morning. Ridgetop winds will continue from the east in the 25-30 mph range. Temperatures will be in the low 30's at 1,000' and mid 20's along ridgelines through the day.
Tomorrow: Snowfall making its way to sea level will hopefully greet us in the morning as snow lines are forecast to lower. Snowfall should taper off by tomorrow morning bringing a break in storms before yet another wave of snow (and possibly rain at sea level) ushers in later on Sunday. Stay tuned!
*Seattle Ridge anemometer (wind sensor) reading uncommon wind direction during height of storm yesterday. Sensor is now rimed back over.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880')||33||14||1||30|
|Summit Lake (1400')||34||0||0.4||4|
|Alyeska Mid (1700')||33||2||1.92||4|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400')||30||*WNW||*25||66|
|05/18/21||Turnagain||Observation: Tincan Ridge||Joe Kurtak|
|04/30/21||Turnagain||Observation: Sunburst||W Wagner Forecaster|
|04/27/21||Turnagain||Observation: Tincan Ridge||Joe Kurtak|
|04/26/21||Turnagain||Observation: Magnum||Creighton/ Hoople|
|04/25/21||Turnagain||Observation: Sunburst||Nick D'Alessio|
|04/24/21||Turnagain||Observation: Airplane obs||Johnston-Bloom / DiJulia /Hilliard Forecaster|
|04/24/21||Turnagain||Observation: Corn biscuit||Heather Johnson|
|04/23/21||Turnagain||Avalanche: Lynx Ck Drainage||W Wagner Forecaster|
|04/23/21||Turnagain||Avalanche: Sunburst||Eeva Latosuo|
|04/23/21||Turnagain||Observation: Center Ridge Turnagain pass||Joe Kurtak|
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.