AN EMB145 CAPT RPTED THAT A FLT ATTENDANT WAS INJURED DURING A TURB ENCOUNTER IN ZID'S AIRSPACE; AND THAT A NON-REVENUE FLT ATTENDANT VOLUNTEERED TO TAKE OVER CABIN DUTIES.

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WE WERE FLYING IN IMC AT FL310. WE NOTICED ON THE RADAR THAT THERE WERE STORMS (3 CELLS) AT OUR 12 O'CLOCK POS; ABOUT 50 MI AHEAD. ACCORDING TO OUR COMPANY MANUAL; WE MUST STAY AT LEAST 20 MI AWAY FROM THE STORMS. I DECIDED TO BE CONSERVATIVE; AND REALIZED THAT WE COULD MAKE A SMALL DEV AT 50 MI AWAY; INSTEAD OF A LARGE DEV CLOSER. THEREFORE; AT ABOUT 50 MI FROM THE STORMS; WE BEGAN TO DEVIATE. WE WERE IMC; SO WE COULD NOT SEE AHEAD OF US. WE ENCOUNTERED SOME MODERATE TURB THAT KICKED THE AUTOPLT OFF. ONCE WE CORRECTED THE SIT; WERE OUT OF THE TURB; AND GOT THE AUTOPLT BACK ON. WE CALLED TO THE CABIN TO MAKE SURE THAT EVERYONE WAS ALRIGHT. A FLT ATTENDANT THAT WAS NON-REVING ON OUR FLT ANSWERED AND SAID THAT OUR FLT ATTENDANT HAD HIT HER SHOULDER AND WAS LYING IN THE GALLEY. WE WERE TOLD SHE WOULD NOT BE ABLE TO CONTINUE HER DUTIES; AND THAT THE NON-REVENUE FLT ATTENDANT WOULD SECURE THE CABIN FOR US. WE THEN DECIDED TO DIVERT TO CMH TO SEEK MEDICAL ATTN FOR OUR FLT ATTENDANT. AFTER A NORMAL LNDG; SHE WAS TAKEN TO THE HOSPITAL BY AMBULANCE. THE ONLY THING THAT I BELIEVE COULD HAVE PREVENTED THIS IS A BETTER ONBOARD WX RADAR. THE WX RADAR ON BOARD THE ERJ HAS A VERY SMALL DISH AND IS; IN GENERAL; VERY POOR.