Observation: Maybird Gulch

Observation Date
2/4/2016
Observer Name
Greg Gagne with Gunner
Region
Salt Lake » Little Cottonwood Canyon » Maybird Gulch
Location Name or Route
Maybird
Weather
Sky
Overcast
Precipitation
Light Snowfall
Weather Comments
Comfortable temps (-10C) and only a hint of westerly winds. Very light on and off snowfall. Beautiful, cool, graybird day.
Snow Characteristics
New Snow Depth
1"
New Snow Density
Low
Snow Surface Conditions
Powder
Snow Characteristics Comments

An optimistic few cms of very light density snow fell from the sky.

Avalanche Problem #1
Problem
Persistent Weak Layer
Problem #1 Comments

Biggest concern is persistent/deep slab issues in thinner snowpack areas.

Comments

Quick observation from today. Route was in Maybird up to 9600'. Later exited via Maybird Gulch to Little Cottonwood road. (Exiting to LCC stream and road is a treat this season - been awhile since we've been able to do this.)

Overall found a very deep and stable snowpack; best I've seen all season. Probes were showing the snowpack to be over 2 meters deep, and my partner dug a pit and got an ECTX. This was on a N aspect at 9400' with a 240 cm snowpack. In the top 120 cms of snow there were a few visible layers of preserved NSF, but we could not get any clean shears. Snowpack went from F-hard at the surface, to 4F, to 1F. Just the way we want to see it. We did not dig to the ground.

Was finding the weak snow at the surface to sluff easily on steep slopes.

Also curious to see if we could find any preserved surface hoar underneath the top 20-40 cms of snow. Maybird Gulch can often be a good place for surface hoar to develop and preserve, and the steep-sided gully can be a classic terrain trap. Dug lots of quick hand puts and could not find any, and could only get snow at the surface to sluff.

Down at 8200' was finding a somewhat thick rain/temperature crust down 30 cms with faceted snow beneath, but couldn't find a similar SH layer to what Trent found in Broads Fork.

Overall am feeling the snowpack is continuing to gain strength. I definitely agree with the Low danger at lower elevations, and Moderate up to 9500'. I also think that in LCC/BCC it is mostly Moderate at upper elevations as well. The biggest concern is of course upper elevations on NW through E aspects that have repeatedly slid this season where the snowpack is thinner and now possibly wind-loaded. I saw this structure Tuesday morning in Main Porter Fork, and it also seems prevalent along the Park City ridgeline where the snowpack is thinner, and the hazard remains at Considerable.

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