Observation: Chugach State Park

Location: Arctic Valley

Route & General Observations

Started tour at 1300 up Arctic Valley bottom to point just east of Avalanche Gully at 3445ft.

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?No
Collapsing (Whumphing)?Yes
Cracking (Shooting cracks)?No
Observer Comments

Abundant whumping to 40ft out from skis in valley bottom.

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

Snowing with visibility at ΒΌ mile at start of tour. Snow accumulating at 1cm/hr at start which increased to 2.5cm/hour by end of tour at 1600. At 1500 was 30deg with winds from 170@5-10mph.

Snow surface

Snow surface variable from loose snow at lower elevations to wind board at higher elevations.


Did quick pit on NW aspect on 18deg slope 0.1 miles NE of Avalanche Gully. TD = 70cm. Top down: 70-68=F new snow. 68-55 P 0.5mm rounds. 55-40 = 4F 0.5 rounds. 40-35 = P 1.0 rounds. 35-20 = F 2.0 rounding facets. 20-0 = 1F 4.0mm rounding facets.
Tests: Got STV at 55cm. STE at 15 cm. CT14@20cm. Got ECTPV @20cm (pic).
A skier triggered avalanche occurred near the head of Avalanche Gully on 11/9 approx. 0.1 mi SW of this pit site. See anonymous observation for that date on CNFAIC site.

Photos & Video
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