AN ACR FLC LANDS ON A WET RWY WITH A STRONG TAILWIND; FLOATING HALF WAY DOWN BEFORE TOUCHDOWN; AND STOPS IN THE LAST 1000 FT.

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ON MAR/MON/96; I WAS FLYING AN ACR ACFT FROM BWI TO ATL; AS FO ON A B757. OUR SCHEDULED DEP WAS AT XA00; BUT COMPANY OPS DELAYED US ON THE GND FOR 1 1/2 HRS DUE TO TSTMS APCHING ATL. NATURALLY; BY THE TIME WE DID GET TO ATL THE TSTMS WERE OVERHEAD THE FIELD. WE WERE BEING VECTORED AROUND THE FIELD FROM THE NE ARR GATE TO THE W FOR AN APCH TO RWY 8L. DURING THE COURSE OF THAT VECTORING WE GOT BEAT UP PRETTY BADLY TRYING TO NEGOTIATE BTWN 2 CELLS. BY NOW WE WERE IN THE 'GET IT ON THE GND MODE.' WHILE W OF THE FIELD OUR RWY GOT CHANGED SINCE THE CELL OVER THE RWYS 9L/R MOVED N AND OVER RWYS 8L/R. WE QUICKLY SET UP THE FMS FOR ILS RWY 9R AT LOW ALT; 15 NM OUT ON FINAL. AFTER BEING CLRED FOR THE APCH AND INTERCEPTING THE LOC; THE ILS WENT DOWN FROM A LIGHTNING STRIKE. PANDEMONIUM STRUCK THE AIRWAVES NEXT; BUT WE FOLLOWED SOMEONE ELSE'S LEAD AND CALLED FOR A VISUAL APCH IN MARGINAL VFR. THEN ON FINAL APCH AT 500 FT TWR CALLED THE WINDS 230 DEGS AT 17 KTS. BUT WITH THE MINDSET WE WERE IN; RATIONAL THOUGHT DID NOT APPEAR. IT'S OBVIOUS TO ME NOW THAT THAT IS GREATER THAN 10 KTS OF TAILWIND WITH A VERY WET RWY. BUT RIGHT THEN I WAS JUST JUDGING MY CAPT'S COMFORT LEVEL SINCE HE WAS FLYING; RATHER THAN GOING BY THE BOOK. SO WE CONTINUED! THE CAPT STRUGGLED WITH WINDSHEAR ALL THE WAY TO THE FLARE. FLOATED IT 1/2 WAY DOWN THE RWY BEFORE TOUCHDOWN. ONE REVERSER DIDN'T DEPLOY AND THE OTHER REVERSER WAS DRIFTING US OFF CTRLINE. NOW ON BRAKES ONLY; WE STOPPED IN THE LAST 1000 FT OF RAIN SOAKED; RUBBER DEPOSITED RWY. STUPID! MORAL OF THE STORY: DON'T TRUST OTHER'S COMFORT LEVEL. LIMITATIONS AND FARS ARE THERE FOR A REASON.