B737 LANDED AT HOU BELOW PUBLISHED LNDG MINIMUMS.

Narrative

FLT TO HOU WAS UNEVENTFUL. ATIS AT HOU WAS 500 FT BROKEN; 5 MI VISIBILITY WITH PATCHY FOG. WE HAD GOOD VISIBILITY ON THE FIELD AND ASKED FOR A TIGHT TURN ON. WE HAD BRIEFED THE CATII APCH AS A CATIII PRACTICE TO UPDATE MY CURRENCY (WITH THE NEW RULES) BECAUSE THE WX WAS NOT RPTED THAT BAD AND WE COULD SEE IT; SO IT SEEMED LIKE A GOOD TIME TO GET THAT PRACTICE CATIII APCH OUT OF THE WAY. ON BASE; APCH SAID VISIBILITY WAS ? MI; SO WE WENT TO THE CATII SPECIAL APCH. INSIDE THE FAF (AND ALSO BELOW 1000 FT) TWR CALLED THE RVR AT 800 FT. WE BOTH QUESTIONED IF WE COULD CONTINUE AND RATHER THAN DIVERT OUR ATTN FOR TOO LONG; I SAID YES WE COULD DO A 'LOOK SEE.' WE DID; AND WE ACQUIRED VISUAL REF PRIOR TO MINIMUMS AND LANDED UNEVENTFULLY. AFTER LNDG; WE BOTH SEARCHED THE BOOKS BECAUSE WE BOTH THOUGHT WE HAD READ SOMETHING ABOUT A GAR ON CATII OR CATIII APCHS. ALL WE COULD FIND WAS AN AIII WARNING AND LOSS OF A REQUIRED TRANSMISSION METER; BUT SOMEWHERE IN THE BACK OF MY BRAIN; IN HINDSIGHT; I THINK I READ THAT WE SHOULD GO AROUND IF THE WX DROPS ON A CATII OR CATIII APCH EVEN AFTER THE FAF; IE; NO 'LOOK SEE.' I CAN'T FIND IT IN THE BOOK; SO I DIDN'T KNOW IF I MADE THE CORRECT DECISION OR NOT.