Size 3: Could bury and destroy a car, damage a truck, destroy a wood frame house, or break a few trees
We observed the entire west face of North Chiwaukum went big sometime in the last week during the snow and wind events of the 10/12-13 of March. 13 March - HS-N-R3-D3. Additional shallower (older?) spun in crowns (D2+) were less apparent, but visible on nearby Middle Chiwaukum.
Signs of Unstable Snow
Did you see shooting cracks?
Did you experience collapsing or whumpfing?
We went out for some sun and a view of the ranges near Stevens Pass. Under clear skies and cool temps we saw widespread wind transport from moderate easterly winds. Transport was observed on all exposed peaks and ridgelines above ~5500'. Gazing across valley, we saw the westerly avalanche on North Chiwaukum. While it may have gone during the loading event of the 10th, but may as well have gone during or after the easterly winds from the and snow the 12-13 of March. The crown depth was hard to estimate, but a couple meters seems to be right with a width in excess of 100 meters.
Observed Avalanche Problem #1:
Consistent moderate ridgeline east winds and moderate transport ATL.