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Observation: Brighton Perimeter

Observation Date
3/6/2017
Observer Name
B
Region
Salt Lake » Big Cottonwood Canyon » Brighton Perimeter
Location Name or Route
Mid and Upper BCC; and Lackawaxan
Weather
Sky
Broken
Precipitation
Light Snowfall
Wind Direction
Northwest
Wind Speed
Moderate
Weather Comments
Moderate winds, in the mid 20's at upper elevations, with gusts into the 40's. Even at mid elevations where it's usually protected, the winds were active and transport was observed at all elevations. Temperatures remained on the cold side and mid winter like. The sun came out briefly throughout the day and by 1500 it had enough punch and exposure to dampen the S and SW at 8500 feet on steep terrain. Very light snow showers in the moring not adding up to more than a trace.
Snow Characteristics
New Snow Depth
13"
New Snow Density
Low
Snow Surface Conditions
Powder
Wind Crust
Damp
Snow Characteristics Comments

13 inches of light density snow fell, and the event began around 1830 on Sunday night. Snow fall rates were sustained for up to 7 hours at S5 plus. Winds were strong during the event out of the WNW. Temperatures had already begun to drop by the time the snow began to fall. Above 8500 feet the snowpack had already refrozen substantially and the bonding of the new snow was poor. Below 8500 feet the recent warm temperatures had facilitated the snowpack to be moist, and as such the bonding was better. By mid day on Monday the top 5 inches of the new snow was still dry, but it was getting damp from below due to these moist layers.

Winds adversely affected the snow in all upper elevation locations except on the east aspects. Even in moderately protected areas the new snow was dense and thick. Mid elevation protected areas and heavily treed areas in between 9000 and 9800 feet rode well in 8 to 10 inches of moderate to light density snow. Low and moderate angled slopes rode the best. Even on the seemingly well filled in upper elevation east slopes it was "bottom feeding" on slopes with angles >30 degrees.

Red Flags
Red Flags
Heavy Snowfall
Cracking
Red Flags Comments
MInimal cracking in stubborn dense pencil plus wind slabs. No naturals observed from the storm.
Avalanche Problem #1
Problem
Wind Drifted Snow
Trend
Decreasing Danger
Problem #1 Comments

LIngering isolated sensitive wind slabs most likely were out there. Tried to avoid the wind disturbed areas.

Avalanche Problem #2
Problem
New Snow
Trend
Increasing Danger
Problem #2 Comments

On slopes steeper than 35 degrees it was easy to trigger and entrain snow and initiate Loose Snow Avalanches, and these may be more sensitive and reactive on Tuesday on the steep slopes on the upper half of the compass.

If the sun is out for any sustained period of time on Wednesday, Wet Loose activity will be come an issue on SE, S, SW and WSW.

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