Avalanche

Eddy Mountains, Parks Creek Summit Area

Nick MeyersMount Shasta
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Photo d’observation 1Photo d’observation 2Photo d’observation 3Photo d’observation 4Photo d’observation 5Photo d’observation 6Photo d’observation 7Photo d’observation 8Photo d’observation 9Photo d’observation 10Photo d’observation 11Photo d’observation 12Photo d’observation 13Photo d’observation 14Photo d’observation 15

Quick report

Cracking
specific
Collapsing
specific

Off duty day, touchy conditions in the Eddy Mountains with wet, heavy, deep snow travel. Not for the faint of heart. Observed one natural avalanche and significant whumphing and shooting cracks. These were all the red flags we needed to adjust our travel to low angle terrain for the day. 

Observed a natural avalanche on a northeasterly facing aspect above the FS17 road. Wide propagation, some debris on road. Observed major whumphing and cracking on northwesterly slope, cracks shooting hundreds of feet ahead of our skin track. One to two feet of heavy snow sits on top of loose, sugary snow. The snowpack felt very unstable. Whatever slopes did not fail today will be ripe for triggering in the coming days with additional weight of new snow.

Weather

Air Temp
35
Cloud Cover
obscured
Wind Loading
moderate
Rain Elevation
5,500
Recent Snowfall
30-60 cm
Snow Avail For Transport
small smounts

Misty, warm, trees dripping, but snowing. Light snow transitioned to heavy snow by afternoon. A couple inches accumulation. A very wet day.

Snowpack

At the Mt Eddy weather station, 67 inches of snow on the ground. After a 28-day dry spell, a wet and warm storm has brought 1-2 feet of new snow to the area, and more on the way. In some areas in the Eddy Mtns on northerly aspects below and near treeline, faceted (sugary) snow has formed during the dry spell. This is now buried by the heavy, new snow...a poor snowpack structure. We observed nautral avalanches and significant shooting cracks and whumphing today.

Avalanche

Size
D2.5 R3
Type
SS
Aspect
NW
Trigger
N
Elevation
6700 ft

Natural avalanche observed on northwesterly facing aspect, steep slope above FS 17 road, Sec 33. Persistent weak layer of facets that formed during 28 day dry spell rest on firm bed surface and 1-2 feet of heavy, wet snow on top.