Observation: North Fork Park

Observation Date
2/4/2024
Observer Name
Gagne/Johnston (x 2)/Heilweil/Peterson
Region
Ogden » Ben Lomond » North Fork Park
Location Name or Route
North Fork Park
Weather
Sky
Few
Wind Direction
South
Wind Speed
Moderate
Weather Comments
Sustained winds from the south above 8,000' with some drifting along exposed ridges.
Snow Characteristics
New Snow Depth
4"
New Snow Density
Medium
Snow Surface Conditions
Powder
Wind Crust
Snow Characteristics Comments
5 cms new at trailheads increasing to 15 cms at 8,300'. We found a few small pockets of wind-drifted snow along ridges that were reactive.
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Increasing Danger
Problem #1 Comments
Just as we've seen in the central Wasatch with several PWL avalanches occurring in steep, thin, rocky terrain occurring over the past 10 days, I'm sure there are similar slopes in the Ogden mountains where an avalanche failing in the PWL could be triggered. With wind and snow on the way this week, the PWL problem will likely increase.
Snow Profile
Aspect
Northeast
Elevation
8,100'
Comments
We traveled as high as 8,300' and found a crust on all aspects, with 5-15 cms new snow on top of the crust. Above 7,500', the bond of the new snow to the crust was poor on north and east aspects, with a thin layer of near surface facets (NSF) just above the crust where shovel tilt tests produced an easy, clean shear. The NSF layer above the crust does not look like a big problem, but any wind or storm slab may be sensitive to this weak interface and the crusts will provide an easy bed surface for avalanches to run on.
Photos:
Pic #1 The skies cleared early afternoon providing great views in the alpine.
Pic #2 The south winds began to drift snow as winds increased in the afternoon.
Pic #3 Profile of the top 20 cms of the snow surface showing the weak snow just above the crust.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate
Coordinates