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Observation: Turnagain

Location: Seattle Ridge

Date:
Observer:
Route & General Observations

Seattle Ridge weather station repair mission. Ventured over toward Pyramid Pk after getting the weather station back in order.

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

None

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

Overcast skies. Light Southerly winds and temperature in the upper 20'sF.
Very calm, but low light, day in the backcountry.

Snow surface

3-5" of light snow from Tuesday night. Variable wind effect. Soft settled power in sheltered zones, up to a foot deep or more in some areas, otherwise 6-8" of soft snow. Along ridgeline wind drifts and sastrugi were seen.

Snowpack

We targeted our snow pits on wind slabs as well as the interface between the Valentine's Storm snow and the older underlying surface. We found recent wind slabs to be non-reactive; these showed signs of good bonding and no wind slab avalanches were seen. We did find buried surface hoar (3-5mm) under the Valentine's Storm snow that was buried 70-75cm deep (30").

Pit: 2,800' on a 23 degree slope facing West. Total snowpack depth 230cm (7-8'). This pit was near Pyramid Pk.
ECTX - upon a hard 30+ hit ECTP on the buried surface hoar 75cm deep. While the snowpack at first glance shows a generally right side up nature (strong snow under weaker snow) it did have the thin layer of buried surface hoar roughly 75cm (30") below the surface. At the bottom of the pack, weaker snow could be felt upon probing indicative of old faceted snow, however we did not dig to the ground.

Bottom line: There are still weak layers in the pack that have the potential to avalanche. Triggering a slab that breaks in the buried surface hoar is trending to unlikely, but the potential still exists.

GLIDE Avalanches: The glide crack on Seattle Ridge is opening. Photo below.

Photos & Video
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