TXWY TKOF.

Narrative

THE OCCURRENCE HAPPENED SEVERAL DAYS AFTER THE BIGGEST SNOW STORM OF FEBRUARY. IT WAS A CLR SUNNY DAY. THE ATIS GOLF RECORDED ADVISORY STATED RWY 10/28 WAS CLOSED AND RWY 33L/R WERE IN USE. THE WIND WAS 330 DEGS AT 6 KTS; BAROMETER WAS 30.43 I WAS GIVEN CLRNC TO TAXI FROM THE FBO ALONG THE S TXWY TO RWY 33L FOR TKOF. I TAXIED TO A POS ON THE S TXWY JUST S 200 FT OF RWY 33L AND PERFORMED MY RUNUP AND EQUIP CHK AND INST SETTINGS. AFTER RECEIVING CLRNC TO TKOF FROM THE TWR I TAXIED TO THRESHOLD OF WHAT I THOUGHT WAS RWY 33L. I TURNED THE AIRPLANE IN THE DIRECTION OF RWY 15R AND LOOKED FOR ANY ARRIVING TFC. ALL WAS CLR. I TURNED THE AIRPLANE UNTIL THE DIRECTIONAL GYRO SHOWED 33; LOOKED DOWN WHAT I THOUGHT WAS RWY 33L; AND TOOK OFF. ONCE IN THE AIR THE TWR CALL ME AND ADVISED ME TO MAKE A L TURN TO GET ON COURSE. SECONDS LATER THEY ASKED ME IF I REALIZED I TOOK OFF ON THE E TXWY! I TOLD THEM I WAS NOT AWARE I HAD DONE IT. WITH THE SNOW COVERING ALL THE RWY SIGNS AND MARKINGS IT WAS EASY TO BE CONFUSED; ESPECIALLY WHEN THE DIRECTIONAL GYRO SHOWED 33. UNDER NORMAL CONDITIONS RWY 10/24 IS ON YOUR L WHEN USING RWY 33L; BUT BECAUSE OF THE SNOW CONDITIONS AND THE DIRECTIONAL GYRO INDICATION IT TURNED OUT THE RWY ON THE L WAS 33L AND I WAS HDG DOWN THE EAST TXWY. I WAS AIRBORNE IN SECONDS AND MADE THE TURN EASILY AVOIDING ANY PROBS. WHEN I RETURNED TO THE ARPT 3 HRS LATER; I CALLED THE TWR TO DISCUSS THE PROBS OF THE SNOW COVERED IDENTIFIERS ON THE RWYS. ALL OF THE RWY SIGNS WERE COVERED WITH SNOW AS WERE THE PAINTED NUMBERS ON THE RWYS. THE ATIS MESSAGE OF RWY 10/28 CLOSED DID NOT SAY IT WAS COMPLETELY SNOW COVERED AND NOT PLOWED AT ALL. THE CONFUSION WAS BECAUSE OF THE SNOW COVERED IDENTIFIERS.