I'm not sure I understand how PSki can be 15cm, when there is a hard crust less than 10cm deep.
somewhat unrealistic scenario with temps below freezing and wet, slushy surface snow
daytime temps being above freezing
SAomewhat unrealistic with corn snow in the rain
the problem will  escalate if temps rise
I would be watching conditions closely for the crust to break down with rain and warm temps.
Possibly rain will run on the crust but over time it is possible to get wet slide avalanche but I would consider this scenario for wet slab avalanches
with the rain and above freezing temps I would be watching for the crust to break down and naturals to possibly start
this is a confusing scenario with natural activity yet a thick solid crust. One could interpret this as the terrain one is standing on is solid but terrain above one's head, perhaps around rocks, is suspect. I hesitate to flag the scenario as unrealistic but my answwers may be inconsistent.
the problem may not be serious right at the moment, but I would be watching for it to change given the incoming solar radiation
I would be surprised to find these conditions without solar effect to drive them
So long as the Cr is intact no worries, as soon as Cr breaks down due to rain then it moves over past somewhat serious
as the day warms up the scale will move to more serious
how much rain?

I guess if the temps are below freezing point and its raining, it must be freezing rain
Why is it wet and slushy with no rain and below freezing temps.
So long as Corn Snow means that the crust is holding this is no problem.
Sharpen your edeges
Here Temperature relating to the break down of the crust is most important.
Sounds like really bad skiing I'm going for coffee

i dont like terrain traps and full comitment, its always nice to have a second choice
given the slope angle it is unlikely the slope will slide, but it could fail and propagate to release a slide overhead.
As long as temperature remains below freezing.

being caught in a small wet avalanche is serious, so the fact that a large avalanche is possible dosn't add a huge amount of extra risk given it is a loose avalanche
Still cant picture that terrain trap in a 20 degree planar slope.
I made a mistake on the last one (I missed the not exposed to sunlight) - please reduce to 'somewhat favourable'
assuming there is no hazard from above, loose will not run below 20 degrees
Temperature must remain below freezing.