PLT ATTEMPTED TKOF IN ADVERSE CONDITIONS RESULTING IN LOSS OF ACFT CTL.

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I WAS DEPARTING IN A BE58 BARON OPERATED UNDER A FAR PART 135 CARGO SVC ON AN IFR FLT FROM BUFFALO; NY; TO UTICA; NY. THE WX AT BUFFALO WAS SKY PARTIALLY OBSCURED; 800 FT VARIABLE OVCST; AND 3/4 MI VISIBILITY; VARIABLE TO 1/2 MI. THE WINDS WERE FROM THE W AT 15 KTS GUSTING TO 20 KTS; AND RWY 23 WAS IN USE. BUFFALO TWR CLRED ME FOR DEP AND I TAXIED ONTO THE RWY FOR TKOF. AT THIS POINT IN TIME I OBSERVED APPROX 1/4 TO 1/2 INCH OF SNOW ON THE RWY AND CONSIDERED BRAKING ACTION TO BE POOR. I BROUGHT THE ACFT TO A STOP ON THE RWY CTRLINE; CHKED LOCS CTRED; AND APPLIED TKOF PWR. DURING THE TKOF ROLL; THE VISIBILITY WAS POOR DUE TO BLOWING SNOW AND A SMALL AMOUNT OF SNOW ON MY WINDSCREEN. APPROX 10 SECONDS INTO THE TKOF ROLL AT ABOUT 70 KTS; ALL SYS WERE INDICATING NORMAL; HOWEVER; A STRONG GUST OF WIND WXVANED MY ACFT TO THE R AND I WENT OFF OF THE R SIDE OF THE RWY. WHILE ABORTING THE TKOF I HEARD 3 LOUD BANGS WHICH I ASSUMED WERE MY PROPS AND ACFT STRIKING THE RWY EDGE LIGHTS. I REGAINED CTL OF THE ACFT; INFORMED BUFFALO TWR OF WHAT HAD HAPPENED; AND THAT BRAKING ACTION WAS POOR. I TAXIED TO THE RAMP WITHOUT FURTHER INCIDENT. AFTER SHUTTING DOWN; I INSPECTED THE ACFT AND FOUND PROP DAMAGE TO BOTH SIDES AS WELL AS SOME SCRAPES ALONG THE UNDERSIDE OF THE ACFT. AFTER SPEAKING TO BUFFALO TWR PERSONNEL; I WAS INFORMED THAT THEY HAD RECORDED WIND GUSTS IN EXCESS OF 50 KTS DURING THE TIME I WAS DEPARTING. THERE ARE SEVERAL KEY ISSUES THAT CAUSED THE DOMINO EFFECT TO TAKE PLACE. FIRST OF ALL; DUE TO STRONG WINDS AND BLOWING SNOW THE TXWYS AND RWYS WERE SNOW COVERED WHICH MADE FOR SLIPPERY CONDITIONS AND POOR BRAKING ACTION. SECOND; THE ENTIRE WIDTH OF THE RWY WAS NOT PLOWED. THIRDLY; RWY 23 AT BUFFALO HAS CTRLINE LIGHTING. WHILE SEPARATELY THESE THINGS MAY MEAN NOTHING; THESE COMBINED FACTORS GAVE ME THE OPTICAL ILLUSION THAT THE RWY WAS WIDER. THE SNOW AT THE RWY EDGES WERE COVERING THE EDGE LIGHTS IN SUCH A MANNER THAT THEY APPEARED TO BE THE CTRLINE LIGHTS. THIS ILLUSION COMBINED WITH BLOWING SNOW; STRONG XWINDS; ICY RWYS; POOR VISIBILITY; AND MY INACTION TO ASSURE THE ACFT REMAINED ON THE RWY CTRLINE CONTRIBUTED TO A DANGEROUS SIT WHICH INADVERTENTLY CAUSED THIS INCIDENT. PERHAPS TO AVOID FUTURE INCIDENTS LIKE THIS FROM REOCCURRING; ARPT AUTH SHOULD ASSURE THAT RWYS ARE FULLY PLOWED; AND THAT THE RWY EDGE LIGHTS ARE CLRLY AND VISIBLY DISTINGUISHABLE FROM CTRLINE LIGHTS; ON THE OTHER SIDE. PLTS NEED TO BE AWARE OF HAZARDOUS RWY CONDITIONS; THAT NOTHING IS OBSTRUCTING THEIR VIEW OUT OF THE WINDSCREEN; AND THEY KNOW WHERE THE RWY CTRLINE IS AND USE IT.