Observation: Cardiff Fork

Observation Date
12/26/2018
Observer Name
Greg Gagne
Region
Salt Lake » Big Cottonwood Canyon » Cardiff Fork
Location Name or Route
Cardiff Fork / Cardiac Ridge
Weather
Sky
Overcast
Precipitation
Light Snowfall
Wind Direction
Northwest
Wind Speed
Light
Weather Comments
Few breaks of clearing, but overall very limited visibility today. Occasional S-1 snow showers. Very light wind from the NW.
Snow Characteristics
New Snow Depth
6"
New Snow Density
Low
Snow Surface Conditions
Powder
Snow Characteristics Comments
Snowfall overnight and today totaling around 20 cms. Today's snowfall was very low-density - water/snowfall ratio is ~3.5%. The only wind effects I noticed were a few small cornices and a few denser slabs just right along the ridgeline, but once you dropped below ridgetops, no wind-affected snow was found.
Red Flags
Red Flags
Recent Avalanches
Red Flags Comments
Evidence of several small class 1 natural loose snow sluffs in steeper terrain. These only ran within the new snow, and likely ran during periods of higher precipitation intensity overnight. Also saw a larger, skier-triggered sluff that ran down into lower Toledo Bowl. The sluff covered portions of an existing uptrack.
Comments
Very little wind affect in Cardiff Fork up to 10,500 on all aspects. Did see what could have been some cross-loading from NW winds on Little Superior Buttress. Few small cornices and denser slabs right at the ridges - these were sensitive, but very small. Their sensitivity indicated they could be an issue if there were larger drifts elsewhere.
On Tuesday I was finding the Christmas Day 5-10 cms to have bonded poorly with the existing snow surface of denser snow (with graupel) from Monday. I was getting very easy shears with shovel tilts, and long-running sluffs in steeper terrain. Was a bit suspicious that there may have been some near-surface faceting late in the day on Monday, Christmas Eve. But today was not identifying any issues with this old interface, and the only sensitivity was in the new storm snow.
Photos below are of natural sluffs in Cardiff (there were quite a few, but these were all shallow with small debris piles) as well as the skier-triggered slide well down off of Flagstaff and Toledo Bowl.
More low-density snow in the forecast for Thursday, but not expecting large amounts (5-10 cms). Biggest concern will be any increase in the wind speeds which has plenty of loose, low-density snow available for transport.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate