Gust front from big-arse TS at NZMA during the Walsh flying school.
Mate, I was in a coach boat on Lake Karapiro when that (or one of the many just like it last week) came thru - went from glass calm to metre high waves in about 60 seconds - row boats going everywhere! Had to sit it out on the bank for about 45 mins. Was that the CB that dumped 6" of hail on the top of the Kaimais?
I checked the Wx out when I got home - tops at FL56...........