Sonora Pass Snotel

Location Name: 
Sonora Pass Snotel
Date and time of observation: 
Fri, 03/16/2018 - 14:32
Location Map: 

Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain

Observation made by: Avalanche Specialist
Snowpit Observations
More detailed information about the snowpack: 

Our stormboard measured 55cm (22") of new snow since yesterday. With Wednesday's 32cm (13") our 72 hour snow total is 87cm (34"). Observations referenced a melt freeze crust below the new snow that was acting as a bed surface in hand pits. Today this crust had softened and was unsupportable ~87cm deep. Precipitation particles were partly decomposed & rime was observed for short periods of time. Wind scabbing was noticed atop the low density snow. At the peoples gate trailhead ~12" had accumulated overnight & another 6" during the work day.

Snowpack photos: 
55cm HN24
chest deep
walking to snotel
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: 
Greater than 1 in. per hour
More detailed information about the weather: 

At the Sonora Pass Snotel & BAC Snow Study Plot ~14:30 winds were swirling but dominated from the Northeast. The sky was thick with clouds & snow precipitation estimated at 3" per hour. Blowing snow & accumulations falling from trees made for an excting afternoon with 10' of visibility while snowmobiling. Air temperature was -6.6C (20F) & winds were an erratic 8mph with gusts to 23mph. Low visibility kept us from seeing avalanches. Be fairly certain that avalanches are occuring naturally on all aspects & elevations with slopes over 35 degrees.