BWRA Conditions

Location Name: 
Leavitt and Sonora
Region: 
BWRA
Date and time of observation: 
Sun, 03/03/2019 - 12:00
Location Map: 


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

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

Full BWRA tour today with a morning trip to up to Leavitt Lake and an afternoon spent around Sonora Pass.  Widespread "hero snow" and limited wind damage provided quality sledding conditions for all in attendance.  

We broke trail up to Leavitt at around 10:30am.  It appeared the "Repeat Offender" had avalanched multiple times mid storm with various debris piles obscured by additional snowfall.  The deepest HST of the day was just below treeline approaching Leavitt Lake where it seemed like close to 3ft had accumulated with our last round of snow.  The new snow up around the lake was more scoured and wind-affected with a slight density inversion at the surface in exposed terrain.  This wind-compacted surface would plate off in 2-3ft. sections where it was more stout.

I observed a few additional faint crowns from mid-storm avalanches that were partially obscured from additional snowfall.  Nothing bigger than D2.  Climbing up toward Sonora from Sardine Meadows we could see a fresh wind slab on a NE aspect above McKay creek.  D3 R4 with approx. 1-2ft. crown.  This was the only significant avalanche activity noted today.  The Sonora side of the BWRA HST seemed to be 2-2.5ft.  

Lee terrain features (N-E aspects) above 9.5K were loading with additional wind-transported snow throughout the day and should be considered suspect tomorrow with a bluebird day on tap.  

Most W-S aspects below 9K were at least slightly damp by 3pm prior to our departure.   Loose wet activity increased significantly below 8.5K with roller balls on southerly aspects.  Below 8K I spotted a handful of D1 wet sluffs on southerly aspects and minor loose wet activity on all aspects.  

Wet snow conditions below 8K on the road this afternoon will transition to frozen ruts and firm conditions with a hard freeze forecasted for tonight.  A late enough start tomorrow to let the road surface soften is advised.   

Snowpit or crown profile photo or graph: 
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
50% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Light
Precipitation: 
Snow
Air temperature trend: 
Warming
Wind Direction: 
Southwest
Accumulation rate: 
Less than 1 in. per hour
More detailed information about the weather: 

We experienced light winds in most terrain sampled today.  Moderate SW winds ideal for wind slab formation were observed building cornices and moving snow to the lee side of ridgelines in exposed terrain.  

Periods of moderate visibility from intermittent S-1 snowfall mainly in proximity to the crest.