Observation: NWAC Forecaster

All Observations

Basic Information

Observation Date:

February 24, 2023

Submitted:

February 24, 2023

Observer:

NWAC Forecaster - Dallas Glass

Zone or Region:

West South

Location:

Pyramid Peak, Government Meadows, Naches Pass (All aspects, 3000-5200ft)

Recent Avalanches?

None Observed

Cracking?

None Experienced

Collapsing?

None Experienced

Rounding surface hoar was found in the snowpack at the 2/13 interface but did not produce any significant results.

Surface hoar and near surface facets were abundant on the snow surface at all elevations.

A sled supportable surface crust was found at lower elevations.

Snow blown out of the trees can help you anticipate recent wind directions.

Wind clues like these can help you anticipate wind loaded aspects.

Quick shovel tilt test can let you check the bond of the old and new snow.

Advanced Information

Cloud Cover:

Clear

Wind:

Light , S

New/Recent Snowfall:

No new snow.

Beautiful day. Clear skies, cold temps, and generally light winds. About as nice as it gets.

Avalanche Observation Comments:

No avalanches observed.

Wind: Textured surfaces, drifts, rime, and wind lips were found on nearly all exposed features even below treeline from the recent E winds. This showed potential loading on non-standard aspects (SW-N). Wind slabs were up to 15in (36cm) deep and very firm. Test slopes did not produce cracks.

Upper Spx: The snowpack changed dramatically about 4800ft with much colder and dryier snow on the surface. The height of snow also increased from about 120cm at 4500ft to well over 200cm at 5000ft. While we could find older layers (including rounding surface hoar) in the upper snowpack, tests did not produce any significant results.

In sheltered areas 4-8" (10-20cm) of soft dry powder was present.

At lower elevations a thick and snowmobile supportable surface crust was found throughout the terrain.

Problem	Location	Distribution	Sensitivity	Size	Comments
Wind Slab	N E S W	Isolated Specific Widespread	Unreactive Stubborn Reactive Touchy

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