Observation: American Fork

Observation Date
4/10/2025
Observer Name
Kelly, Miller, Wieringa, Pressman
Region
Provo » American Fork
Location Name or Route
American Fork
Weather
Sky
Clear
Wind Direction
Southwest
Wind Speed
Calm
Weather Comments
Winds were calm to light on the ridgetops and highest peaks. The wind was blowing from the northwest- shifting to the southwest while we were out. Skies were mostly clear with warm sun.
Snow Characteristics
Snow Surface Conditions
Melt-Freeze Crust
Damp
Snow Characteristics Comments
Snow surface was mixed between a melt-freeze crust and damp snow surface depending on timing and aspect. The east facing warmed up first. We were off of steep slopes as they warmed up in the sun and avoided traveling through any snow where we were sinking into the surface.
North facing slopes on the ascent were frozen and by the time we were exiting the south and west facing slopes were warming up. We observed signs of old roller balls and wet loose avalanches from the past few days of warming.
Avalanche Problem #1
Problem
Wet Snow
Problem #1 Comments
Photo of wet loose avalanches running on a dirt layer on a south facing slope at 10,600' in elevation.
Snow Profile
Aspect
Southeast
Elevation
9,500'
Comments
This snowpit was on a southeast aspect at 9,500'. Total height of snow was 5.5' (165cm). There were two layers that were fist hard and both of these had more water pooling and were dirtier (dust layers). The snowpack in this location was isothermic which means that it was the same temperature 32°F (0°C) from the top to the bottom. What this means is that water had percolated throughout the snowpack and it is starting to turn into a spring pack. Even with clear weather and temperatures hovering just above freezing at night, the snowpack is not freezing from the top to the bottom. We were traveling on the surface melt layer supported by the knife hard melt freeze crust just below the surface. Later in the afternoon this layer would have been saturated and we would be sinking through the upper layers of the snowpack even with skis on.

Photo of large wet grains at the layer that was 4' (115-120cm) from the ground.
We played the sun today and traveled on steep slopes facing east-south-west, timing our travel by getting onto those slopes just after the sun had warmed them, so they were soft, but before they became so wet that we were sinking in. The danger where and when we traveled today was LOW.
Today's Observed Danger Rating
Low
Tomorrows Estimated Danger Rating
None
Coordinates