Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 150; Flight Crew Type 1450
Communication Breakdown
Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Illness / Injury; Inflight Event / Encounter Weather / Turbulence
General Physical Injury / Incapacitation
Human Factors; Weather
Descending into ZZZ we were getting vectored off the arrival for an approach. The First Officer (FO) flew through a small buildup that seemed fairly benign. Unfortunately there was enough vertical development to create an automatic moderate turbulence report. I didn't want to dictate how the FO flew the arrival; but thought we should have deviated a few hundred yards around this little cloud. While I expected a little turbulence; I certainly didn't think it would be that strong. On debrief; the FO seemed unaware that we didn't have to fly directly into the cloud and could have maneuvered a little.
A319 Captain reported First Officer flying into turbulence resulting in an injured Flight Attendant. First Officer was unaware of option to deviate clear of cloud