Pro Field Report
Basic Information
Observation Details
Observation Date:
February 13, 2021Submitted:
February 13, 2021Observer:
Lundy, CreelmanZone or Region:
Banner SummitLocation:
Cape Horn Ridge (6700-9000', NE-E-SE)Signs of Unstable Snow
Recent Avalanches?
None ObservedCracking?
None ExperiencedCollapsing?
None ExperiencedSnow Stability
Stability Rating:
GoodConfidence in Rating:
HighStability Trend:
SteadyBottom Line
The late-January weak layer (facets/surface hoar) seems to have stabilized. The December facets are buried 4-5' feet deep, and are still surprisingly weak. Storm total since 2/11 seems to be 6-10" depending on elevation. Wind loading at ridge level was pretty minor.
Media/Attachments
Advanced Information
Weather Summary
Cloud Cover:
ObscuredTemperature:
mid 20s (estimated)Wind:
Light , WNew/Recent Snowfall:
HST since 2/11 ranged from around 15cm at highway level to 25cm at upper elevations. 2-3cm fell from 1000-1500S-1 to S1 while we were in the field (1000-1500). Conditions were fairly wet at highway level but drier up high. Winds were light from the W to SW, but not moving much snow.
Snowpack Observations
Two pits (8750' & 8900', ENE) showed negative results on 1/27 which was visually apparent in both locations and down ~70cm. SH remnants at this layer were subtle. One pit finally propagated after bashing on the shovel in an ECT.nAnother thin but unremarkable SH layer was present in both pits, possibly buried 2/2, down about 40cm. Got weak ECTN results.n 12/11 is buried 140-150cm deep and remains surprisingly weak (4F to 4F+).
HS at upper elevations is 180cm+.
Minimal wind loading was observed along an exposed ridge crest that typically experiences significant drifting. Small cornice drops produced no results. Cornices from last weeks wind event remain touchy,
Avalanche Problems
| Problem | Location | Distribution | Sensitivity | Size | Comments |
|---|---|---|---|---|---|
Deep Persistent Slab
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Layer Depth/Date: 140-150cm Weak Layer(s): Dec 11, 2020 (FCsf) Comments: Rose indicates observed terrain. |
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Wind Slab
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Comments: Observed wind loading was pretty minor, but snow was moving and some drifting observed along exposed ridges. |