Wed, March 10, 2021 Turnagain Pass Avalanche Forecast

Wed, March 10th, 2021

Alpine
Above 2,500'

Considerable (3)

Treeline
1,000'-2,500'

Moderate (2)

Below Treeline
Below 1,000'

Moderate (2)

Alpine Above 2,500'		Considerable (3)
Treeline 1,000'-2,500'		Moderate (2)
Below Treeline Below 1,000'		Moderate (2)

Danger Scale:

No Rating (0)

Low (1)

Moderate (2)

Considerable (3)

High (4)

Extreme (5)

Avalanche Problem 1

Wind Slabs
Almost Certain

Very Likely

Likely

Possible

Unlikely

Likelihood
Historic (D4-5)

Very Large (D3)

Large (D2)

Small (D1)

Size

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

Likelihood of Avalanches

Terms such as "unlikely", "likely", and "certain" are used to define the scale, with the chance of triggering or observing avalanches increasing as we move up the scale. For our purposes, "Unlikely" means that few avalanches could be triggered in avalanche terrain and natural avalanches are not expected. "Certain" means that humans will be able to trigger avalanches on many slopes, and natural avalanches are expected.

Size of Avalanches

Avalanche size is defined by the largest potential avalanche, or expected range of sizes related to the problem in question. Assigned size is a qualitative estimate based on the destructive classification system and requires specialists to estimate the harm avalanches may cause to hypothetical objects located in the avalanche track (AAA 2016, CAA 2014). Under this schema, "Small" avalanches are not large enough to bury humans and are relatively harmless unless they carry people over cliffs or through trees or rocks. Moving up the scale, avalanches become "Large" enough to bury, injure, or kill people. "Very Large" avalanches may bury or destroy vehicles or houses, and "Historic" avalanches are massive events capable of altering the landscape.

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

More info at Avalanche.org

East winds increased overnight and a few inches of snow fell. The winds are forecast to remain strong enough to transport snow today and the snow will continue with precipitation intensity peaking in the afternoon. Expect this combination of snow and wind to form sensitive wind slabs on top of weak snow surfaces. During the past week, we have seen near-surface facets and surface hoar develop all the way up to ridgetops. Prior to this storm the weak snow was sitting on top of stiff old wind surfaces and sun crusts, and this has the potential to be very sensitive to triggers now that it is buried. If the weather forecast verifies and we actually get a foot of snow by this afternoon, human triggered avalanches up to 2′ will be likely in wind-loaded terrain in the Alpine. Natural avalanches may also occur at upper elevations. It is really important to pay attention to changing conditions.

What to watch out for if you’re headed out today:

Areas with current wind-loading (winds should blow all day, with a wind direction shift this evening)
Slabs lower on slopes from cross-loading (Seattle Ridge is a good example)
Stiff snow over softer snow (punchy snow)
Cracks shooting from your skis or machine
Whumpfing (collapsing of the snowpack into the faceted snow underneath)
Out of the wind, you might see some shallow storm slabs forming.

Remember, expect any wind slab you find to be sitting on weak faceted snow and/or surface hoar and poor bonding is likely. There is also a chance a persistent slab avalanche could be triggered if an avalanche triggered near the surface overloads the older weak layers in the upper 1-3’ of the snowpack and steps down creating a larger avalanche.

Sluffs: Steep slopes that are sheltered from the wind have 2-6” poorly bonded snow on the surface, which makes it easier to trigger dry loose avalanches (sluffs). Be aware of the potential for sluffs to gain volume and speed in steep terrain, since these can be dangerous if they knock you off your feet or your machine.

Surface hoar on a wind crust below Kickstep, 3.7.21. Expect slabs forming over this set-up to be sensitive today.

Weather

Wed, March 10th, 2021

Yesterday: Skies were cloudy with very light snow showers and only a trace of accumulation during the day. Snowfall picked up around 8 pm and 2-4″ fell overnight. Winds were easterly 10-15 mph with gusts into the 20s during the daytime. East winds picked up overnight blowing 15-30 mph with gusts into the 40s and 50s. Temperatures were in the low 20°Fs to mid 30°Fs.

Today: Skies will be cloudy with snow throughout the day, 6-8″ expected. Snowfall is forecast to be heaviest in the late afternoon and continue overnight with an additional, 2-4″. Winds will remain easterly 15-30 mph with gusts into the 40s and 50s. Winds will shift to the northwest in the evening, blowing 15-25 mph with gusts into the 30s. Temperatures will be in the mid 20°Fs to low 30°Fs during the day dropping overnight to the teens and single digits as colder air moves into the region.

Tomorrow: Snow showers showers in the morning tapering off by the afternoon. Temperatures in the teens and low 20°Fs. Winds will remain northwesterly 15-25 mph with gusts into the 30s. Overnight skies become partly cloudy and temperatures dip to around 0°F. Winds ease a bit overnight but remain northwesterly. There is some sunshine in the forecast for Friday into the weekend.

PRECIPITATION 24-hour data (6am – 6am)

	Temp Avg (F)	Snow (in)	Water (in)	Snow Depth (in)
Center Ridge (1880′)	29	3	0.3	110
Summit Lake (1400′)	28	1	0.1	45
Alyeska Mid (1700′)	28	3	0.2	114

RIDGETOP 24-hour data (6am – 6am)

	Temp Avg (F)	Wind Dir	Wind Avg (mph)	Wind Gust (mph)
Sunburst (3812′)	19	NE	16	52
Seattle Ridge (2400′)	22	E	12	27

Observations

Recent Observations for Turnagain Pass

Date	Region	Location	Observer
05/22/23	Turnagain	Avalanche: Tincan	Nick D'Alessio
05/12/23	Turnagain	Avalanche: Tincan, Sunburst, Magnum, Cornbiscuit	Heather Thamm
05/07/23	Turnagain	Observation: Tincan – Bear Tracks	CNFAIC Staff
05/05/23	Turnagain	Observation: Seattle Ridge	AS/ WW Forecaster
05/02/23	Turnagain	Observation: Cornbiscuit	Schauer/ Sturgess Forecaster
05/02/23	Turnagain	Observation: Seward Hwy Turnagain Pass	Joel Curtis
04/30/23	Turnagain	Observation: Magnum	Ayla, Kit Crosby, Barton
04/29/23	Turnagain	Observation: Tincan	John Sykes
04/28/23	Turnagain	Avalanche: Taylor Pass/Pastoral	Schauer/ Creighton Forecaster
04/28/23	Turnagain	Avalanche: Tincan	Andy Moderow

Riding Areas

Updated Thu, June 01st, 2023

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: mailroom_r10_chugach@fs.fed.us

Area	Status	Weather & Riding Conditions
Glacier District
Johnson Pass	Closed	Closed May 15.
Placer River	Closed	Closed May 15.
Skookum Drainage	Closed	Will close to motorized use on April 1, 2023 per the National Forest Plan.
Turnagain Pass	Closed	Will close on June 1.
Twentymile	Closed	Scheduled closure May 1.
Seward District
Carter Lake	Closed	Scheduled closure May 1.
Lost Lake Trail	Closed	Scheduled closure May 1.
Primrose Trail	Closed	Scheduled closure May 1.
Resurrection Pass Trail	Closed	Closed to motorized use for the 2022/23 winter season per Forest Plan. Open next season.
Snug Harbor	Closed	Extended opening until May 15.
South Fork Snow River Corridor	Closed	Scheduled closure May 1.
Summit Lake	Closed	Scheduled closure May 1.