Avalanche Education Providers
We are transitioning to a Spring-time snowpack. Thawing during the day with temperatures in the 40s, & freezing at night with temperatures in the low 20s & briefly into the teens. The layers of the snowpacks are warming to near freezing (isothermal) & moisture from daytime thawing is percolating through the pack on the path of least resistance. Fridays afternoon conditions were mostly stable with some localized whumphing of the top crusty surface(9inches). This is still a sign of instability & should be considered a hazard on slopes steeper than 35 degrees. Large temperature changes(& vapor pressure gradient) will cause faceting of round snow grains during cold nights, & will change the physical character of the grains. The faceting process will transform a round, dense grain, into a pyramid-shaped hollow cone with only the points touching. This allows for maximum airspace & promotes collapse & crack propigation throughout the snowpack.
A High Pressure ridge is building bringing clear skies with warm days & cool nights.