If you want
mammatus clouds, here is the view looking up at the sky on Sunday morning, May 18, 1980, after Mt. St. Helens erupted, dumping a half inch or more layer of ash over eastern Washington state.
Isn't that amazing. But there's the boil. Pyrocataclysm.
New Zealand so temperate, those winds are cozying up to some elevated light CAPE but smoothed out for orthographic upflow -- no 'nader juice' bringing up the boil. Similar smoothed-flex cloud structures in both SoCal and the Ganges Basin.