On Saturday, it didn't take an expert to know conditions were suspect. All sorts of slides, even down low were the snow became consistent. Any evidence of crowning or natural slides screams the probability of human-caused slides.
Anyway, avy conditions were quite high when I headed up there from Mono Village. Left a little after 8 a.m., but the sun had baked all that fresh snow so quickly. About 8-10 inches of fresh up high, above 10,000 feet and there were slides everywhere. Snow was quite firm and snowshoes weren't required until I got a little higher. While I could have used them, the snow was mushy and slow going regardless and the stability wouldn't have improved had I brought snowshoes, which can be cumbersome depending on the quality of the snow.
I got near the base of the couloirs a little before 1 p.m. and decided to turn around and snowboard from there. West couloir had a wet slide come down about 500 feet in length. I was solo and it didn't seem worth it to continue with all the slides. I am sure the snow has consolidated since then because it had snowed Wednesday and Thursday, then warmed up big time on Saturday, but going early is the best recipe for getting caught in a spring slide. Even a small wet one can do damage.
Car to summit to car is possible on Matterhorn in one day, but Saturday turned out not to be a good day for that.