We were airborne behind the storm, watching it on the wx radar. It seemed to be about 10 miles across and was quite sharply defined. Thankfully it didn't affect our flight as it had gone through our destination half an hour or so earlier. There was a great trail of fractostratus behind it and we could easily identify the path it had taken. I had commented to my colleague earlier in the day how tropical the air felt; it was extremely humid and no better in flight so I wasn't really surprised to see such a big cell. It was thankfully quite isolated.
Terrible shame about the Austers. One of my favourite aircraft types.