Avalanche

Frenchman Ck

Zach PetersonSawtooth & Western Smoky Mtns
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Observation photo 1

Quick report

Cracking
specific

Today was a blustery. snowy day. Snowfall began around 11 AM, and SW wind increased through the day—blowing steadily moderate for most of the day. Signs of instability were isolated to the upper 6-10 inches of the snowpack, where the wind had built small reactive drifts along ridgetops. The snowpack structure is less than inspiring with a thick upper snowpack overlaying weak sugary snow below. Snowpack tests were unremarkable, but poor structure lends concern relating to the stubborn, but consequential nature of triggering a thick avalanche. 

Cracking was observed along ridge tops and ridge adjacent slopes where today's wind had built small thin drifts. On a small test slope I was able to trigger a small wind slab ~6 inches deep and 50 feet wide.

Weather

Air Temp
Single digits
Cloud Cover
overcast
Wind Loading
moderate
Recent Snowfall
Trace-1 inch by 2PM
Snow Avail For Transport
moderate amounts

Partly cloudy skies become overcast around 11 AM. Parking lot temperatures were in the single digits (read on truck thermometer). SW winds were light to moderate this morning before increasing this afternoon.

Snowpack

January drought weak layers are buried 75-100 cm deep, and snowpack tests were unremarkable (ECTX, PST 42/100 END @ 93cm: HS 210, E, 9100').  Winds were building small reactive drifts near and along ridge tops. 

Avalanche

Size
D2 R2
Aspect
SE
Trigger
N
Elevation
8800 ft