Wind Effect at Duck Pass, Mammoth Area

Duck Pass
Submission Info
Thursday, January 2, 2020 - 2:00pm
Red Flags: 
Recent loading by new snow, wind, or rain
37° 33' 44.9892" N, 118° 57' 23.0904" W
Snowpit Observations
More detailed information about the snowpack: 

We toured from the Tamarack TH to 11,900' near Duck Pass, then descended Duck Pass and back to the TH past Arrowhead Lake.  We saw evidence of a few recent point releases near the Mammoth Crest, but otherwise did not note any signs of instability.  A moderate N wind and light cloud cover kept surface snow cool all day - we only had glopping issues once, and only briefly then.  Some snow was being transported up high, but it seemed like exposed surfaces had been mostly scoured already.  No flagging off nearby peaks.  In the alpine, many rocks were lying exposed and skin tracks from Feinberg & co yesterday had already been excavated by wind overnight.  Skiing above treeline was variable, with small sastrugi, both supportable and breakable wind crust, and dense powder all at the party.  Below treeline, the snow was mostly 4-6" of dense pow except on solar aspects where not protected by canopy shade.  Below 9500', snow on W aspects was becoming moist by the end of the day, but N aspects were still dry.

Weather Observations
Blowing Snow: 
Cloud Cover: 
50% of the sky covered by clouds
Air temperature: 
Wind Speed: 
Air temperature trend: 
Wind Direction: 
Accumulation rate: 
More detailed information about the weather: 

Full but gauzy cloud coverage

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