I'm cautious of flying in certain area's of NZ when the wind is NW and over say 25 kts at 2000ft.
I normally fly North to South Island which goes past some reasonable lumpy bits (Marlborough Sounds) which can generate allot of turbulence when the wind is just right. The area acts as a Venturi and its not uncommon to see 30-40 kt winds this time of year
I have been flying along in bumpy conditions to have some very nasty gusts which put my 'recovery from unusual attitudes' training to good use, To be honest there have been a few seconds when i have not been in total control of the aircraft.
I try an avoid those types of flights, but sometimes needs must... as last minute commercial flights can be difficult to book.