Avalanche: Turnagain

Location: Seattle Ridge

Route & General Observations

Regular route up to Seattle Ridge and down into Seattle Creek drainage to take stock of the last storm’s avalanches and anything new. Cleared the weather station wind sensor on the way back.

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 NaturalRemote Trigger Unknown
Avalanche Type UnknownAspect Unknown
ElevationunknownSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Rununknown  
Avalanche Details

Several old natural wind slab avalanches seen today. All were from the high winds and snowfall on Friday 2/25. These slabs were all between 1-4' thick and some quite large - propagating several hundred feet wide in some cases. They were on both west facing steep terrain and on cross loaded slopes on east faces across Seattle Creek. One area in upper Seattle Creek has debris filling the creek that came from wind slabs on both sides of the drainage.
Examples of slopes that avalanched:
West face of BBQ hill
West face of Toilet Bowl (upper Triangle Bowl/heawall area)
East face of Big Chief

All these sent debris into valley bottoms running 1500-2000'.

Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Observer Comments

No red flags seen today. Only the signs of natural avalanche from Friday's storm.

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

Mostly sunny, yay!
Temps were mid 30'sF in parking lot and mid 20's along ridge.
Winds were light from the west.

Snow surface

Surface crusts exist up to around 1500' where they are thin enough to ignore.
Most areas have seen a high degree of wind effect from Friday's winds. Especially along Seattle Ridge and any upper elevation zone. That said, there were many folks enjoying the snow just off ridgelines on all aspects.
Very small surface hoar is growing - 1mm kind of small at this point...
The sun was barely able to moisten steep south aspects, but no roller balls or wet sluffs were seen today (there were several yesterday however).


We did not dig any pits but made several informal tests on wind loaded slopes. The wind slabs we found were stubborn and we could not even get them to crack under us. We also did not see any signs of other parties able to trigger a wind slab. Some sluffing was seen from skiers in steep terrain, but these were relatively small.

Looking with binoculars at the crowns of the old avalanches, it appears that all the activity was indeed wind slabs formed in the new snow and not from deeper weak layers failing. We were specifically looking for this in Seattle Creek to see if any avalanches broke deeper.

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.