AN ACR B757 FLC FOUND THEMSELVES SHORT OF FUEL WHEN TSTMS CAUSED THEM TO DIVERT FROM ATL. THE NEAREST ALTERNATES WERE SOME DISTANCE AWAY SO THE CAPT DECIDED TO LAND AT A NEARBY ARPT THAT WAS ADEQUATE; BUT NOT AUTH IN THE OPS MANUAL. AFTER SOME DIFFICULTY GETTING SVC AND CARING FOR A PAX; THE FLT CONTINUED TO ATL.

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I WAS PIC OF THE ABOVE FLT. THE FO SERVED AS PF ON THAT LEG. WE EXPERIENCED CONSIDERABLE DELAY AND WX VECTORING ON ARR. WE WERE VECTORED TO RWY 26R. A MEDIUM WX CELL WAS ABEAM THE APCH END OF RWY 26R. 2 PRECEDING ACFT MISSED APCH ON RWY 26R AND ATC THEN VECTORED US TO RWY 27L. OUTSIDE ANVIL FIX; ATC DECLARED MICROBURST ACTIVITY ON FINAL WITH AIRSPD LOSS OF 45 KTS. WE REQUESTED A TURN OFF OF FINAL AND RECEIVED A 180 DEG HARD CLB TO 4000 FT. ABOUT 20 MI S OF THE ARPT; WE RECEIVED A VECTOR E AND WE REQUESTED CURRENT WX CONDITIONS AT THE ARPT. APCH SAID THEY STILL HAD TSTMS AND GUSTS TO 55 KTS. SINCE AN APCH TO ATL WAS INDEFINITELY OFF; AND FUEL WAS ONLY ABOUT 8600 LBS; WE STARTED ALTERNATE PLANNING. WE CALLED FLT CTL AND WERE TOLD WE WOULD BE 'PUT ON THE LIST.' I FELT WE WERE RUNNING OUT OF TIME. I HEARD FLT CTL GIVE SOME MGM DIVERT WX AND INSTRUCTIONS. IN THE FMS I ENTERED MGM ON THE PROGRESS PAGE WHICH PREDICTED 4000 LBS OF FUEL AT MGM. VERY CLOSE TO EMER FUEL. JUDGING FROM OUR POS; ALL ALTERNATES WERE ABOUT EQUALLY AS FAR AWAY AS MGM. I REQUESTED DIRECT TO MGM AND DECLARED MINIMUM FUEL. ENRTE TO MGM I SENT A DIVERT ACARS TO FLT CTL. WE LOADED THE FMS RTE TO MGM AND RECEIVED AN INSUFFICIENT FUEL MESSAGE. I WAS CONCERNED IF WE HAD ANY ADDITIONAL DELAYING PROBS WE COULD HAVE A REAL PROB. ABOUT THIS TIME; CTR SUGGESTED CSG ABOUT 20 MI AWAY. I HAD BEEN TO CSG MANY TIMES AND KNEW THE APCHS; ARPTS AND RWYS. I ACCEPTED CSG AS THE DIVERSION ARPT. WE GOT CSG ATIS AND MADE AN UNEVENTFUL APCH AND LNDG WITH ABOUT 5000 LBS OF FUEL REMAINING. THE LOW FUEL MESSAGE APPEARED AT RWY TURNOFF AT CSG. AFTER LNDG; THE PROBS PRESENTED THEMSELVES: NO USABLE JETWAYS; NO TUGS; NO AIRSTAIRS; AND FUELING PROBS. ON THE GND WE WERE UNABLE TO CONTACT FLT CTL ON THE RADIO OR ACARS. I EXITED THE ACFT ON A CHERRY PICKER AND CALLED FLT CTL BY PHONE. WE REFUELED THE ACFT AND I RECEIVED ALL DISPATCH DOCUMENTS. WE STARTED ENGS AND TAXIED FOR TKOF WHEN THE CSC RPTED A PAX HAD FAINTED. 2 MEDICAL DOCTORS AND A NURSE ATTENDED THE PAX. WE RETURNED TO THE PARKING PAD AND THE EMT CAME OUT AND BOARDED FROM THE CHERRY PICKER. THE DOCTORS; NURSE; PAX AND PAX'S FRIEND CONCLUDED SHE COULD CONTINUE TO ATL. AN ACARS MESSAGE FOR RE-DISPATCH WAS RECEIVED. THE FLT TO ATL WAS UNEVENTFUL. EMT MET THE ACFT. THE PAX LEFT ON HER OWN AND MET THE EMT'S. THE EMT PRONOUNCED HER OK. THE PAX AND HER FRIEND SAID THEY WOULD BE OK ON THEIR OWN. SUPPLEMENTAL INFO FROM ACN 374005: THE CAPT ELECTED TO DIVERT TO AN ADEQUATE; BUT UNAUTH ARPT (CSG) FOR THE B757. THE APCH AND LNDG WAS UNEVENTFUL BUT THERE WAS NO PAX HANDLING EQUIP FOR THE B757. THE PROB WAS USING 'NO ALTERNATE' FUEL LOADS IN AREAS WHERE SUMMER TSTMS ARE COMMON.