Hemlock Ridge to the Highway

Hemlock Ridge
Submission Info
Saturday, April 8, 2017 - 3:00pm
Red Flags: 
Recent loading by new snow, wind, or rain
Obvious avalanche path
Hemlock Ridge, June Lake 37° 44' 35.16" N, 119° 6' 7.236" W
Snowpit Observations
More detailed information about the snowpack: 

Observer: doug lewis, Eastern Sierra Avalanche Center
Date: Apr 8, 2017, 7:55 PM
Loc: Hemlock Ridge 
Lat/Lon:37.7431, -119.1020
Elevation: 10050 f
Aspect: N,  Angle: 34°
Signs of Instability: Wind Loading
Sky Cover: OVC
Precipitation: Snow, Light snowfall - 1 cm/hour
Wind Speed: Moderatesubjective
Wind Direction: SW
Blowing Snow: Moderate SW
New Snow Storm:44cm 
Boot Penetration: 45cm

Comments: 10-15 cm new below 8500' overlaying 2-3cm weak melt/freeze crust. Very moist large rounds below. Above ~8500', 15 to 50cm overlaying previous snow surface, new snow depth increases with elevation. Signs of SW wind transport on all exposed slopes above ~ 7000', loading NW-N-NE-E-SE aspeccts with recent Cornice building in favored locations. No cracking observed. Test slopes, minor surface sluffing. No slides observed. Stab tests hint at a possible weak wind slab 25 cm from surface, CTM 12,14,15, @ 25cm from surface, Q2-3 x 3. Secondary failures CTH 21,23, Q2-3, @ 34cm from surface x2. Additional failure at 105cm, CTH 28, Q2. Old/news snow interface. Multiple hand shears tests, moderate 25cm consistently Q2 to 3, occasional 35cm Q3. Overall, Storm Slabs are stabilizing but Wind Slabs on NW-N-NE-E-SE aspects remain a concern. 

Snowpit or crown profile photo or graph: 
Any other comments about the observation or links to outside pages that have more info on the observation: 

Toured from June Mountain from J-3 to Hemlock Ridge, upper mountain lifts all closed. 

Mammoth Lakes scenic loop closed in the AM and remained closed as of 1600. 


Weather Observations
Blowing Snow: 
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Air temperature trend: 
Wind Direction: 
Accumulation rate: 
Less than 1 in. per hour
More detailed information about the weather: 

Moderate snow in the early AM, decreasing to showers toward the PM. Occasional strong convective shower passing through the area with moderate to heavy snowfall of short durations throughout the afternoon. Cloud cover varied from: overcast, obscured, mostly cloudy, occasional breaks with high cloud cover overhead. Precipitation - moderate snow in the AM, scattered convective showers in the PM with ~2" new by 1530 above ~9000'. Light to moderate SW winds throughout the day, evidence of moderate to strong SW winds previously. 

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