FLT ATTENDANT RPT; B777; NRT-DFW; SEVERE TURB ON TKOF CAUSED PLANE TO DROP SEVERAL HUNDRED FT TWICE. NO INJURIES.

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FLT X WAITED ON THE TXWY FOR APPROX 1 1/2 HRS WAITING FOR A SEVERE STORM TO PASS. WE THEN TOOK OFF AND IMMEDIATELY HIT TURB. THE CAPT HAD ALREADY WARNED THE FLT ATTENDANTS WE SHOULD PLAN TO STAY IN OUR JUMP SEATS FOR AT LEAST 20 MINS AFTER TKOF. SO WE WERE FIRMLY FASTENED IN OUR SEATS. WE WOULD DROP FOR HUNDREDS OF FT THEN HE PULLED UP AGAIN. MOST OF OUR PAX THOUGHT THEY WERE GOING TO DIE AND SO DID I. IN ALL MY YRS OF FLYING; I HAVE NEVER BEEN IN ANYTHING THIS BAD. 3 AIRPLANES TOOK OFF IN FRONT OF US AND NONE HAD WARNED OF THIS SEVERE WX. THE ONLY SOLUTION I SEE WOULD BE NOT TO HAVE TAKEN OFF AT ALL UNTIL THE WX COMPLETELY MOVED OUT OF OUR PATH. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT THE AIRPLANE SUSTAINED NO DAMAGE. THE AIRPLANE DROPPED SEVERAL HUNDRED FT TWICE IN THE 20 MINS IT TOOK TO GET OUT OF THE STORM. THE CAPT CAME OUT OF THE COCKPIT AND TOLD THE CREW THAT HE COULDN'T BELIEVE THAT THE 3 PLANES THAT TOOK OFF BEFORE THEM DIDN'T RPT ANY TURB OR WX PROBS. THE RPTR FELT 'LUCKY TO BE ALIVE.'