Date: 201810
Local time of day: 0601-1200
Location: ZZZZ.ARTCC, FO
Flight conditions: IMC
Weather elements / visibility: Rain; Thunderstorm; Turbulence
Aircraft: A319
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Descent
ATC / advisory: Center ZZZZ
Reporter organization: Air Carrier
Reporter function: Captain; Pilot Not Flying
Reporter qualification: Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Human factors: Communication Breakdown
Anomaly: Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Illness / Injury; Inflight Event / Encounter Weather / Turbulence
Detector: Person Flight Crew
When detected: In-flight
Result: General Physical Injury / Incapacitation
Contributing factors: Human Factors; Weather
Primary problem: Human Factors

Narrative: 100 miles north of [destination]; descending through solid cirrus and deviating around small; imbedded RW/TRW (Rain Shower and Thunderstorm) cells. Zero forward visibility. Using weather radar. Seatbelt sign on. Occasional light turbulence. In the cabin; FA B (Flight Attendant) and FA C are standing in the rear galley. A paramedic and a nurse are assisting an ill passenger in seat 19b. Paramedics are waiting at destination. No ATC [notification was made].We see a small; individual cell ahead on radar: about 4 miles wide with light green rain indication and small amber center. We receive deviation clearance to the left from Control. We change course and continue descent. Visibility zero. When abeam of the cell on our right side; we flew through some imbedded cumulus and a short burst of rain. We received a quick; sudden jolt of moderate turbulence.I called back to the cabin via intercom to check with the cabin crew. I apologized about the event with no warning from us. I was assured that everything was okay although FA C sounded a bit unhappy about the event.We landed and arrived at the gate at [destination] with paramedics waiting to examine the ill passenger. A lot of confusion at the gate after the passengers deplaned with an army of cleaners coming aboard to 'turn' the aircraft. I saw FA A was moving aft to speak to FAs C and B while the cleaners and ground supervisors were on the airplane between us. The paramedics had left the jetway with the ill passenger. It was going to be difficult to wade through the cleaners to speak to my crew who were scheduled to fly the aircraft back to [origin]. Not having heard from them while at the gate; [First Officer] and I assumed our cabin crew were okay. We exited the aircraft to start our overnight.24 hours later; [First Officer] and I arrived at the aircraft for the northbound flight to [origin]. FA C and FA B were present and met us. It was then when we heard that they had sustained injury during the previous day while standing in the rear galley from the moderate turbulence jolt event. Both crew members complained of back and shoulder strain. In addition; FA C had sustained a small cut on her hand while grabbing a hand hold to steady herself.The event occurred because I failed to warn the cabin crew of possible moderate turbulence during descent. So; the crew was completing normal duties when the unexpected turbulence occurred. As is well known; turbulence effects are magnified when in the aft section of aircraft and also there was no warning of small bumps before the big jolt took place.I need to communicate better with my cabin crew during flight to warn them about turbulence ahead and also at the gate after such an event (by intercom; if necessary); to make sure that they are okay. I am not happy about my lack of knowledge about my cabin crew condition as I left the aircraft. One of my roles is to make sure they are okay and to assist them if they are not okay.




Synopsis: A319 Captain reported learning the next day that Flight Attendants had been injured during an inbound turbulence encounter.