Avalanche

Nyack Mountain northeast face

FACFlathead Range & Glacier NP
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Quick report

One several large natural avalanches reported 3/5-6, though date of occurrence not clear. Similar to other recent events: windloaded, north-east facing slope around 7000 feet and possibly triggered by natural cornice fall, sluff, or small slab.

Weather

Howling, cold winds from the northeast

Avalanche

Size
D3
Aspect
NE
Trigger
NC
Elevation
7000 ft

Appears to be a cornice fall onto the slope. The crown at the top of the slide seems to be around 5 ft. Did not notice crowns and debris from below, in Rescue Creek. Noticed when dropped into run. Party reports it's possible that they triggered the cornice fall remotely from opposite side of ridge while ascending.