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Observation: Maybird Gulch

Observation Date
12/30/2014
Observer Name
Greg Gagne
Region
Salt Lake » Little Cottonwood Canyon » Maybird Gulch
Location Name or Route
Maybird Gulch
Weather
Sky
Clear
Wind Direction
East
Wind Speed
Moderate
Weather Comments
As Bruce noted quite well, much windier at the canyon mouths than in the mountains. However, we did feel the winds were affecting snow (and our faces) down to about 10,000'. Perfect winter temps - hovering just about 0F. (When I used to ice climb at Lake Willoughby, Vermont, we used to call these warm spells "Bermuda Highs")
Snow Characteristics
Snow Surface Conditions
Powder
Wind Crust
Snow Characteristics Comments

HS is now about 120 cms (4') although even deeper in some areas. The very light density snow has settled quite a bit with numerous settlement cones. Below about 9.5K no wind affect, however East winds affected many aspects at higher elevations.

Snow felt much stiffer today, likely due to the wind and colder temps. Whereas it was easy to ski relatively low angled slopes the past few days, the stiffer/denser snow today required steeper slopes to move.

On a short tour on Monday Dec 29 (did not submit observation) I was getting 45-60 cm ski penetration. Today ski pens were 30 cms.

Red Flags
Red Flags
Wind Loading
Red Flags Comments
Wind loading seems confined to upper elevation aspects with a westerly aspect.
Comments

Still trying to get a better sense of the current snowpack and it remains challenging. This past week I was finding an overly stable snowpack in my travels, but with a poor structure. Overall I was getting the feeling the mid-pack faceted weak layer was strengthening. Am still thinking this is the case, but the rime/rain crusts now buried anywhere from 30 - 75 cms (1-2.5') are still showing evidence of weaknesses where today we were getting clean shears with Moderate effort both above and below the crusts. (I traveled in this approximate area on Sunday and was getting few clean shears.)

Also worth remembering the rime/rain crusts are not present everywhere (though they are pretty easy to identify with an inverted pole where they are present), and that a layer of NSF formed in early December and was preserved the during the week Dec 15 when we had lighter snow amounts, and was capped by the heavy Solstice storm.

Spatial variability remains the wild card and I'm still leery of traveling on or below steeper slopes, especially those on northerly aspects. I think we're getting there though .....

Plumes coming off of some of the higher peaks from the Easterly winds were especially evident through mid day, and fresh wind drifts on NW through SW aspects may be found at upper elevations. (Aspects where we aren't used to seeing wind drifts.)

Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate