MULTIPLE FLT ATTENDANT RPT; B767-300; STOCKHOLM-CHICAGO; SEVERE TURB FORECAST BY PLTS; FLT ATTENDANTS SKEPTICAL AND UNPREPARED. INJURY TO SECONDARY RPTR.

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THE COCKPIT HAD RPTED TO THE FLT ATTENDANTS THAT AN ACFT AHEAD OF US EXPERIENCED TURB. THEY SUGGESTED THAT WE MAKE NECESSARY PREPARATIONS IN THE CABIN. I WENT TO THE COCKPIT TO QUESTION HOW MUCH TIME IT MIGHT BE BEFORE THIS WOULD HAPPEN. WHILE I WAS IN THE COCKPIT THE TURB BEGAN. I TOOK A SEAT AND BUCKLED UP; REMAINING THERE FOR ABOUT 12 MINS; UNTIL I COULD SAFELY RETURN TO THE CABIN. WHILE IN THE COCKPIT. I SAT QUIETLY. UPON RETURNING TO THE CABIN; I WALKED THROUGH ALL CABINS. PAX WERE CALM. EVERYONE WAS SEATED AND BELTED IN. THE GALLEYS WERE A MESS. BEVERAGE CARTS HAD FALLEN OVER. INSERTS IN THE GALLEYS HAD BEEN THROWN FROM THEIR COMPARTMENTS. NO ONE WAS HURT. ALL FLT ATTENDANTS WORKED TO CLEAN UP. ALL FLT ATTENDANTS WERE VERY SURPRISED BY THE SEVERITY OF THE TURB; EVEN THOUGH WE WERE WARNED BY THE COCKPIT; AS IT IS NOT UNUSUAL TO BE WARNED OF TURB; AND THEN EXPERIENCE ONLY LIGHT CHOP. SOME FLT ATTENDANTS WERE UNABLE TO MAKE IT TO THEIR JUMP SEATS OR A PAX SEAT. THEY SAT ON THE FLOOR. SUPPLEMENTAL INFO FROM ACN 453459: L-HAND SIDE TOILET IN MAIN CABIN HAD DETACHED ITSELF FROM ACFT AND WAS LAYING ON THE FLOOR OF THE LAVATORY. I HAVE A SORE LOWER BACK FROM THE SIT. PROBABLY SHOULD HAVE SAT BEFORE IT HAD STARTED; BUT TRIED TO SECURE SOME THINGS IN THE GALLEY. MAYBE NOT LEAVE BEVERAGE CARTS OUT AFTER SVC BUT STOW BACK IN COMPARTMENT IN GALLEY TILL NEXT SVC.