BE10 PILOT REPORTS LANDING ON CLOSED RWY DUE TO NOTAM NOT BEING AVAILABLE FROM COMMERCIAL FLIGHT PLANNING SERVICE. PILOT REPORTS POOR SERVICE FROM FSS AS THE REASON FOR USING THIS SERVICE.

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GOT THE CALL AROUND XA00 TO REPOSITION OUR KING AIR 100 TO ZZZ FOR AN AMBULANCE FLT. ARRIVED AT THE ARPT; CHECKED WX; DID WT AND BALANCE AND FILED TWO IFR PLANS ON COMMERCIAL WEB SITE. I'VE GOTTEN IN THE HABIT OF DOING THIS SINCE I'VE HAD FSS DROP SO MANY OF MY FLT PLANS. ON THE WX PAGE UNDER NOTAMS; IT HAD TWO FOR ZZZ2 BUT DIDN'T LIST ANY FOR ZZZ. SINCE THERE WAS A BLIZZARD TWO DAYS EARLIER I CALLED THE POLICE DEPT AND REQUESTED THEY CHECK TO SEE IF RWY WAS CLEAR. I WAITED 15 MINUTES AND CALLED THEM BACK. THE DISPATCHER'S RESPONSE WAS THAT THEY WERE BUSY; AND SHE'D CALL WHEN SHE KNEW. AT THIS POINT; I HAD KEPT THE MEDICAL CREW AND THE HOSPITAL WAITING. I MADE THE DECISION TO TAKE OFF AND GET HEADED THERE WHILE I HAD SOMEONE WAIT FOR THE PHONE CALL IN THE OFFICE. MY PLAN B WAS ZZZ1; WHICH ADDED ABOUT 40 MINUTES OF GROUND TIME FOR THE AMBULANCE BUT IS SOMETHING WE HAVE DONE BEFORE. I LIFTED OFF AT XA44 AND HEADED FOR ZZZ. FIVE MINUTES BEFORE I GOT TO ZZZ I RECEIVED A TEXT STATING THE RWY HAD NOT BEEN CLEARED. I HAD ALREADY CANCELLED MY IFR SINCE IT WAS CLEAR AT ZZZ SO I DECIDED TO MAKE A LOW PASS OVER THE RWY TO SEE HOW IT LOOKED. I KNEW AT THIS POINT THE GROUND AMBULANCE WAS ALMOST TO ZZZ SO TO NOW GO TO ZZZ1 WOULD ADD ANOTHER HOUR BEFORE OUR TEAM COULD GET TO THE PATIENT. ON MY LOW PASS THE SURFACE OF THE RWY WAS ALL WHITE BUT NO DRIFTING ANYWHERE. I MADE ANOTHER PASS FROM THE OTHER DIRECTION AND DECIDED TO LAND. LANDED WITH NO PROBLEMS AND TAXIED IN TO THE RAMP AND SHUT DOWN. THIS WAS A PART 91 REPOSITION FLT INTO ZZZ. THE ARPT MANAGER SHOWED UP AND TOLD ME HE HAD NOTAMED THE RWY CLOSED. WHILE THE GROUND AMBULANCE WAS GONE THE ARPT MANAGER AND I CLEARED OFF THE MIDDLE 20 FT OF THE RWY. I GOT HIS VERBAL PERMISSION TO DEPART AND I DID SO WITH NO PROBLEMS. THE MISTAKE I MADE WAS NOT CHECKING NOTAMS MORE THOROUGHLY. HAD I CALLED FSS AND GOTTEN THEM FROM HIM I WOULD HAVE FLOWN TO ZZZ1.