MD88 FLC EXCEEDED ACFT TKOF WT FOR THE RWY USED DUE TO SLIGHT TAILWIND COMPONENT.

Narrative

AFTER SEVERAL DISTRS DURING PREFLT; WE RECEIVED OUR FINAL AWABS. HVY RAIN AND WINDSHEAR WARNINGS PREVAILED AT THE TIME. ATIS WAS CHKED AGAINST THE AWABS CONDITIONS AS WELL AS PAX COUNTS AND FLT ATTENDANT JUMP SEATERS. THE JUMP SEATERS WERE NOT INCLUDED; SO I USED THE TOLERANCE AND ALSO NOTED THAT A FUEL QUANTITY CHANGE EXISTED. THE FO NOTICED THAT THE DISPATCH RELEASE NUMBER HAD CHANGED. WE REQUESTED NEW PAPERWORK. WE THEN CHKED OUR TKOF NUMBERS AND COMMENTED THAT WE NEEDED TO BURN OFF FUEL DURING TAXI OUT. WE USED SLIPPERY/WET DATA AND HAD A SLIGHT TOLERANCE EVEN IF A SLIGHT TAILWIND EXISTED. I ANTICIPATED DELAYS DURING TAXI DUE TO THE POOR WX CONDITIONS. WHEN THE CORRECT PAPERWORK ARRIVED WE VERIFIED THE CORRECT RELEASE NUMBERS. I CHKED THE AWABS AND NOTICED THAT THE NUMBER OF PAX; FUEL QUANTITY; ZERO FUEL WT; AND ACTUAL TKOF WT HAD NOT CHANGED. I THUS ASSUMED THE AWABS WAS STILL CURRENT. 14 MINS HAD ELAPSED BTWN PRINTOUTS. PUSHBACK AND ENG START WERE NORMAL. TAXI WAS SLOW DUE TO HVY RAIN AND NUMEROUS TXWY LIGHTS AND SIGNS OTS. WE WERE INFORMED OF A GND STOP ON WBOUND DEPS. SEVERAL ACFT WERE WAITING FOR TKOF; SOME FOR SEVERAL HRS. I HAD THE FO SHUT DOWN THE R ENG DUE TO OUR FUEL STATE. WE WERE NOW BELOW OUR RATOW FOR RWY 13. WE THEN HAD TO START THE R ENG TO CROSS RWY 22. AFTER XING; I THOUGHT WE WOULD BE DELAYED. HOWEVER; WE WERE TOLD TO 'TAXI UP AND HOLD SHORT RWY 13 -- WE WERE #1.' GND MENTIONED NEW ATIS AND I UNDERSTOOD HIM TO SAY 218 DEGS AT 10 KTS. THE FO DID A GREAT JOB ACCOMPLISHING ALL CHKLISTS. WE WERE CLRED FOR TKOF. ACCELERATION DURING TKOF SEEMED NORMAL WITH THE SLIGHT DISRUPTION THAT OCCURS WHEN GOING OVER THE BUMP AT THE INTXN OF RWY 13/31 WITH RWY 4/22. V1 WAS 130 KIAS AND WAS APCHED AT APPROX 2500-3000 FT REMAINING. THE AIRSPD THEN SEEMED TO STAGNATE. I WAS READY TO 'FIREWALL' THE THROTTLES WHEN I FELT THE NOSE START TO RISE. I THEN OPTED TO SLOWLY ROTATE UNTIL I FELT THE MAIN GEAR LIFT OFF. WE LIFTED OFF WITH LESS THAN 50 FT REMAINING. I THEN INCREASED BACK PRESSURE TO MAKE SURE THE GEAR WOULD CLR THE DIKE. CLBOUT AND LEVELOFF WERE NORMAL. WE DISCUSSED THE APPARENT WIND SHIFT/WINDSHEAR. THE FO CHKED THE ATIS. THEY HAD SWITCHED TO RWY 31. I THEN RECHKED AWABS AND FOUND OUT THE ENVIRONMENTAL CONDITIONS HAD INDEED CHANGED. WE WERE OVERWT FOR RWY 13 ON THE SECOND PRINTOUT OF THE SAME RELEASE AWABS. WE CHKED THE ACFT RESTRS MANUAL AND IT SAID WE WERE STILL WITHIN THE RATOW IF THE WINDS WERE 210 DEGS AT 10 KTS. I MAY HAVE MISUNDERSTOOD THE CTLR'S 310 AS 210. I HAD MADE AN ERROR BY NOT THOROUGHLY CHKING AWABS AND STAYING ON TOP OF THE RAPIDLY CHANGING SEVERE CONDITIONS.