AFTER LNDG ATL ON RWY 27L; AN MD88 CREW IS INSTRUCTED TO CROSS RWY 27R AND NOTICE A DC9 ROTATING ON RWY 27R AS THEY CROSS.

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AFTER LNDG ON RWY 27L IN MARGINAL WX AND MODERATE RAIN; I TURNED OFF THE RWY AT THE 2ND HIGH SPD. THE WINDSHIELD WIPERS WERE ON AND MAKING CONSIDERABLE NOISE. WE WERE GIVEN INSTRUCTIONS TO CROSS RWY 27R AT TXWY T; BUT WITH ALL THE NOISE IN THE COCKPIT WE ASKED THE INSTRUCTIONS TO BE REPEATED AFTER TURNING OFF THE WIPERS. GIVEN CROSS RWY 27R AT TXWY T WE READ IT BACK AND PROCEEDED TO CROSS. WHILE XING WE NOTICED AN ACFT ON TKOF ROLL; I EXPEDITED ACROSS. THERE WAS NO OTHER EVASIVE ACTION TAKEN. AFTER TALKING TO THE TWR SUPVR WHO HAD REVIEWED THE TAPE SAID WE WERE NOT AT FAULT. SUPPLEMENTAL INFO FROM ACN 535784: THE CAPT THEN BEGAN TO CROSS THE RWY AND IT WAS AT THAT MOMENT WE BOTH NOTICED AN ACFT ON THE RWY WITH HIS LIGHTS ON. THE ACFT WAS ROTATING JUST AS WE WERE XING THE HOLD SHORT. THE DC9 PASSED OVERHEAD APPROX 1000-1500 FT AND HAD ROTATED APPROX 4000 FT DOWN THE RWY FROM US AS WE CROSSED THE HOLD SHORT. THE CAPT ACCELERATED THE ACFT ACROSS THE RWY AS SOON AS WE REALIZED THERE WAS A CONFLICT. WE LATER TALKED TO ATC VIA PHONE LINE AND WERE TOLD THAT WE HAD ACTED CORRECTLY AND THAT THE TAPES CONFIRMED WE HAD READ BACK THE XING INSTRUCTION AFTER CONFIRMING IT. CALLBACK CONVERSATION WITH RPTR ON ACN 535803 REVEALED THE FOLLOWING INFO: CAPT RPTR SAID AS HE STARTED TO CROSS THE RWY HE NOTICED THE OTHER ACFT WITH HIS LNDG LIGHTS ON AND REALIZED WHILE XING THAT THE ACFT; A DC9; WAS ON TKOF ROLL. HE SAID HE ADDED PWR TO EXPEDITE AND WAS ABLE TO CROSS THE RWY BEFORE THE DC9 PASSED OVERHEAD. HE SAID BOTH ACFT WERE ON THE SAME TWR FREQ BUT BECAUSE OF THE VERY NOISY WINDSHIELD WIPERS; HE DID NOT HEAR THE TWR CLR THE DC9 FOR TKOF. AFTER DISCUSSIONS WITH THE TWR SUPVR; THE CREW WAS TOLD THEY HAD INADVERTENTLY BEEN INSTRUCTED TO CROSS THE RWY. THE RPTR ALSO COMMENTED THAT THE CTLR MAY NOT HAVE BEEN ABLE TO SEE BOTH ACFT BECAUSE OF POOR VISIBILITY.