FLC OF S80 ENCOUNTERS TSTM AND TURNS TO AVOID IT BUT HAS A JOLT OF TURB. 3 CABIN ATTENDANTS ARE INJURED AND 1 PAX. SEAT BELT SIGN WAS NOT ON AS NO TURB HAD BEEN RPTED.

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LOCATION: PIE; DARBS ARR. CRUISING AT FL330 ON DARBS ARR IN THE CLR AT NIGHT WITH DISCRETION CLRNC TO FL270. CAPT FLYING WITH AUTOPLT ON; RADAR ON 80 NM RANGE MONITORING A WX AREA 35-40 NM SW AT 1-2 O'CLOCK POS. NO TURB HAD BEEN RPTED BY/TO ATC IN THE AREA; AND THE RIDE HAD BEEN SMOOTH. I JUST FINISHED COPYING TPA ATIS WHEN CAPT NOTED A NEW RETURN ON RADAR CLOSE IN AT 11-12 O'CLOCK POS. HE INITIATED A R TURN TO AVOID; CHKED WIND DIRECTION ON PMS; AND LOWERED THE RADAR TILT. THE SMALL GREEN RETURN GREW AND SHOWED YELLOW IN THE CTR. CAPT INCREASED BANK TO THE W AS I CAUGHT SIGHT OF THE CLOUD. WE PASSED THROUGH THE EDGE OF THE PRECIPITATION FOR A SECOND; WITH A GOOD MODERATE JOLT. WE WERE IMMEDIATELY BACK IN SMOOTH AIR WITH ONLY A VERY SMALL INCREASE IN ALT. I WENT BACK TO CHK THE CABIN WHILE CAPT INITIATED DSCNT PER CLRNC. ALL PAX APPEARED OK. THE 3 FLT ATTENDANTS WERE IN THE AFT CABIN WITH BUMPS AND SCRAPES; WITH ONE RPTING SHARP WRIST PAIN. THE SEAT BELT SIGN HAD BEEN OFF; WITH THE FLT ATTENDANTS JUST COMPLETING THE CLEAN-UP FROM THE SVC. WE CALLED TAMPA OPS FOR MEDICAL ASSISTANCE AT THE GATE. AFTER A NORMAL LNDG; ALL PAX DEPLANED EXCEPT ONE. THE FLT ATTENDANTS AND 1 PAX WERE TAKEN TO THE HOSPITAL TO BE CHKED. ALL WERE RELEASED BEFORE MORNING; WITH 1 FLT ATTENDANT RPTED TO HAVE A POSSIBLE BROKEN WRIST. SUPPLEMENTAL INFO FROM ACN 383038: THE SEAT BELT SIGN WAS NOT ON. WE WERE NOT WARNED OF ANY TSTMS IN THE AREA. THE CAPT SHOULD HAVE FLOWN AROUND THE STORMS INSTEAD OF TRYING TO GO OVER THEM.