Curiosity

[BettingMan]

I’m not a pilot and I just work in the industry for a dozen years. I use to flight quite frequently and as result of I’ve experienced before light to moderate turbulence for many times which in some way makes me familiar with such kind of situations. However, my last experience was a bit different of all my previous turbulence episodes. During cruise flight and apparently with clear and good weather, suddenly and unexpectedly the aircraft started to roll and yaw “smoothly” but with significant amplitude. Not a single shake or vibration, no pitching, no Gs. Just roll and yaw which led the Captain to turn on the “fast seat belts”, to command cabin crew to take their stations and provoke total silence among passengers with some of them starting to feel sick. I felt like to be seated in a boat facing crossing waves rather than in an aircraft! This situation last for about 2 to 3 minutes and occurred at approximately at 05H00 UTC over the Pacific Ocean and at around 10º North 110º East.
Is this kind of turbulence (?) frequent or “normal”?
Just for my curiosity if anyone can give a word on this I’ll appreciate it.