The avalanche problem is related to current or most recent snowfall. The amount of additional loading by new snow onto the existing snowpack is the crucial factor of the new snow problem. How critical the loading is, depends on various factors such as air temperature, wind or characteristics of the old snow surface.
In general, a widespread presence and often on all aspects.
Typically between new snow and old snow or within the new snow layers. Occasionally slightly below the old snow surface. In that case, the problem “persistent weak layers” additionally prevails.
Start at the surface but the avalanche flow can erode deeper into the snowpack.
Failure of newly‐formed weak layers within the new snow or due to additional loading by snowfall on existing weak layers (old snow surface or below).
Lack of cohesion between the new snow particles
Typically during snowfall and up to a few days after.
The new snow problem is fairly easy to recognize since it affects most of the terrain but the characterization of the associated danger can be very tricky. Consider critical amounts of new snow and recent avalanche activity.
Wait until the snowpack has stabilized and the weak layer has gained strength.
Danger of being carried away by small avalanches is more important than danger of burial. Consider consequences in extreme terrain.