A B727 ON A NIGHT FLT ENCOUNTERS TURB SPONSORED BY AN UNDETECTED TSTM THAT WAS GROWING RAPIDLY IN THEIR FLT PATH. CABIN ATTENDANT INJURIES RPTED.

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LOCATION: 125 MI NW OF SPP. ENTERING AN AREA OF SCATTERED BUILD-UPS I TURNED ON THE SEAT BELT SIGN AND MADE THE PA CONCERNING THE POSSIBILITY OF TURB. I THEN CALLED THE FLT ATTENDANT TO INQUIRE AT WHAT STAGE THEY WERE IN THEIR SVC. THEY INFORMED ME THAT THE SVC WAS COMPLETE AND ALL CARTS WERE STOWED. THE 3 OF US UP FRONT WERE SCANNING BTWN THE RADAR AND A VERY DARK NIGHT SKY; WITH NO APPARENT CONVECTIVE ACTIVITY WITHIN 50 MI. ABOUT 15 MINS LATER WE SPOTTED A VERY FAST GROWING BUILD-UP OFF OUR NOSE; TOO CLOSE TO AVOID. THE FO TOOK THE ACFT OFF AUTOPLT AND I GRABBED THE PA MIKE TO ADVISE THE FLT ATTENDANTS TO BE SEATED. THE TURB LASTED LESS THAN 15 SECONDS. AFTER CLRING THE WX I CALLED THE FLT ATTENDANTS; AND THEY ASSURED ME EVERYTHING WAS OK. THE REST OF THE FLT WE WERE VERY BUSY WITH DEVS AROUND WX AND MONITORING PTY WX; WITH TOWERING CUMULUS IN THE AREA AND HOWARD AS OUR ONLY ALTERNATE. DURING THIS VERY BUSY TIME I OVERLOOKED THE REQUIREMENT TO RPT THE INCIDENT TO DISPATCH. ONCE ON THE GND THE 3 FEMALE FLT ATTENDANTS STARTED COMPLAINING OF MINOR INJURIES DUE TO A LIQUOR CART; WHICH THEY NOW SAID WAS NOT STOWED AND TIPPED OVER ON A COUPLE OF THEM. THE OTHER ONE CLAIMED A LADY EXITING THE LAVATORY FELL ON HER.