Avalanche: Hatcher Pass

Location: Avalanches near Stairstep/ Arkose ridgeline

Date:
Observer:
Route & General Observations

Recent natural large avalanche today near Stairstep/Arkose ridgeline, approx 3500′ NNW aspect. Strong winds all day formed wind slabs that likely stressed deep persistent slab. Avalanche ran over 2000′ to the creek bed. The snowpack (and our community) has yet reached another tipping point.

Note: The Waterfall path (Arkose area across from Skeetak) ran on 3/20 (pictures below). The avalanche is the video below is a different avalanche and was observed on 3/29. HPAC will investigate today to gather more accurate information.

 

Contact, Location & General Observations
Enter your contact information and a location for this observation. Note that you can submit anonymously, however if you would like to share your name with staff, but not the public, select No for "May we include your name in your observation"
Forecaster Comments

This avalanche should get the hairs on the back of your neck to stand up if corona hasn't already done that.
Of particular note: We haven't seen a large avalanche like this on a NNW aspect since 3/4. All the avalanches we've observed over the past month have been on E to S to W aspects.

Avalanche Details
If this is an avalanche observation, click yes below and fill in the form as best as you can. If people were involved, please provide details.
Trigger NaturalAvalanche Type Soft Slab
Aspect North NorthwestElevation 3500ft
Slope AngleunknownCrown Depthunknown
WidthunknownVertical Run 2000ft
Avalanche Details

Preliminary report of a new natural avalanche today. If you have more information, please contact us.
Two avalanches were reported near Staistep/ Arkose ridgeline across from Skeetak. First avy was on a NNW aspect 3500'(see video)
The second avalanche was reported on an opposing angle on a SW aspect at 3500' (see pic)
This event is separate from the Waterfall path that ran, in a similar area, also to the creek on 3/20.

Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?No
Cracking (Shooting cracks)?No
Observer Comments

Recent avalanches from strong ENE/ESE winds and slab formation throughout the day.

Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.
Weather

Strong winds starting early Sunday morning at 1am. ENE/ESE 16-23 G 34-51 for about 15 hours at 4500' on Marmot. Winds were likely stronger than reported on Arkose ridgeline, to the south of Stairstep where avalanche occurred.

Snow surface

10" soft snow in protected locations from 3/21 available for transport.

Snowpack

No pit data.

Photos & Video
Please upload photos below. Maximum of 5 megabytes per image. Click here for help on resizing images. If you are having trouble uploading please email images separately to staff.