BE1900 CAPTAIN REPORTS GETTING VERY CLOSE TO EDGE AFTER LANDING ON SNOW COVERED RUNWAY. A THUMP IS FELT AND POST FLIGHT REVEALS A PROPELLER BLADE TIP IS MISSING.

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UPON OBTAINING VISUAL CONTACT WITH RWY; I NOTICED THAT IT WAS SNOW COVERED. THIS WAS SOMEWHAT SURPRISING TO ME; SINCE WE HAD BEEN THERE EARLIER IN THE DAY AND THE RWY CONDITIONS WERE CLEAN AND DRY. MY ASSUMPTION IS THAT THE SNOW IN ZZZZ HAD BEEN CAUSED BY AN EXTREMELY FAST-MOVING LAKE EFFECT STORM. LIGHT SNOW WAS IN THE TAF FOR ZZZZ. EVEN THOUGH IT MAY NOT HAVE BEEN SNOWING LONG; IT WAS LONG ENOUGH TO SUBSTANTIALLY COVER THE RWY. THE RWY LIGHTS WERE CLEARLY VISIBLE. THERE WAS NOT A BRAKING ACTION RPT. HAD I KNOWN FULLY THE EXTENT OF THE SNOW ACCUMULATION; I LIKELY WOULD HAVE REQUESTED AN UPDATED BRAKING ACTION RPT FOR THE RWY. AFTER LNDG; THE AIRPLANE BEGAN TO SLIDE TO THE L. I BELIEVE I HAD THE PWR LEVERS IN THE GND FINE POS BUT I CANNOT REMEMBER FOR SURE. I DO NOT RECALL USING REVERSE THRUST. CONCERNED ABOUT EXACERBATING THE SKID; I ATTEMPTED TO CORRECT THE SKID USING LIGHT RUDDER PRESSURE AND PWR INPUTS THE PLANE CAME VERY NEAR THE RWY EDGE LIGHTS AND I HEARD A SOFT THUMP. I REMARKED THAT WE HAD HIT A RWY LIGHT; THOUGH I WAS NOT SURE EXACTLY WHAT PART OF THE AIRPLANE HAD CONTACTED IT. SHORTLY AFTER THE THUMP; I MANAGED TO STEER THE AIRPLANE BACK TO THE CENTER OF THE RWY. THERE WAS SOME SLIGHT VIBRATION COMING FROM THE L SIDE OF THE AIRPLANE. IT FELT LIKE THE L TIRES WERE FLAT. I ELECTED TO CLEAR THE RWY AT THE NEXT TURNOFF. AFTER CLEARING THE RWY; I DECIDED THAT THE SAFEST COURSE OF ACTION WAS TO SHUT DOWN IMMEDIATELY; SINCE THE VIBRATION WAS INCREASING; RULING OUT THE POSSIBILITY OF FLAT TIRES CAUSING THE PROB. I SHUT DOWN BOTH ENGS AND HAD THE AIRPLANE TOWED TO THE HANGAR. THE TIP OF ONE BLADE OF THE L PROP HAD BEEN BROKEN OFF TO THE YELLOW STATION LINE. UPON POSTFLT; THERE WAS NO OTHER DAMAGE NOTED EXCEPT FOR THE SINGULAR PROP BLADE. I AM CONFIDENT THAT THE ACFT NEVER EXITED THE RWY; SINCE THERE WAS NOT ANY MUD; DIRT; OR DEBRIS FOUND IN THE L MAIN WHEEL AND WHEEL WELL AREA. ALSO; IF THE AIRPLANE HAD LEFT THE RWY AT THE TOUCHDOWN SPD OF APPROX 80-100 KTS; IT WOULD HAVE BEEN VIRTUALLY IMPOSSIBLE TO REGAIN CTL. I NEVER FELT THE WHEEL DROP OFF INTO THE GRASS.