Northwest Avalanche Center

Observation: NWAC Forecaster

All Observations

Basic Information

Observation Details

Observation Date:
March 10, 2023
Submitted:
March 10, 2023
Observer:
NWAC Forecaster - Matt Primomo
Zone or Region:
East Central
Location:
Blewett Pass (all 2,400-4,400)

Signs of Unstable Snow

Recent Avalanches? 
None Observed
Cracking? 
Isolated
Collapsing? 
None Experienced

Media/Attachments

Some isolated cracking that appeared limited to only very steep, unsupported areas.
Minimal wind drifting at lower elevations.
A push of westerly winds caused some intense drifting at ridgelines in the middle of the day.
Wet loose in manky, moistening snow down near the highway (2,500ft)

Advanced Information

Weather Summary

Cloud Cover:
Overcast
Wind:
Moderate , W

Calm in the morning, with a switch to westerly winds around noon. Afternoon, winds were steady in the moderate range with broken skies and quickly warming temperatures.

Snowpack Observations

The new snow appeared uncohesive and well bonded to the recent layers up to our high point at 4,400ft. We could Identify the Valentines Crust with some weaker snow above and below it on sheltered northerly aspects, but the crust was quite stout and the weak snow wasn't all that weak.
Winds were transporting some snow at our elevations, but warm temps were combatting to settle out any fresh windslab instabilities in-situ.
With both of these potential instabilities, higher elevation was likely to be a different story today.

Any snow surface that received sun in the afternoon quickly became moist. We noted that the sun was creating more cohesive snow than we found earlier in the morning. We did find some decent cracking and clean shears on the recent sun crust on a SSE aspect at around 4,000ft at one point.
Below about 3,000ft it got a bit manky even in the shade by 1:30pm and we could trigger heavy wet loose slides on steep slopes.

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