DURING A FUEL STOP AT ELKO, NV THE PILOT REQUESTED A WEATHER BRIEFING FOR VFR FLIGHT TO LANDER, WY OR TO COUER D'ALENE, ID. THE FAA FSS BRIEFED HIM ON ADVERSE WEATHER TO BOTH DESTINATIONS, WITH FLIGHT ADVISORIES FOR MOUNTAIN OBSCURATIONS, OCCASIONAL SEVERE TURBULENCE AND SEVERE ICING IN CLOUDS AND PRECIPITATION. THE PILOT DEPARTED WITHOUT A FLIGHT PLAN OR STATED DESTINATION. WHILE ENROUTE, THE PILOT CALLED THE CEDAR CITY FLIGHT ADVISORY FACILITY FOR A WEATHER UPDATE AND WAS AGAIN ADVISED OF ADVERSE WEATHER ALONG THE ROUTE OF FLIGHT. WHEN THE FLIGHT FAILED TO ARRIVE AT LANDER, WY, A SEARCH WAS INITIATED BUT SUSPENDED AFTER 10 DAYS DUE TO LACK OF FLIGHT PLAN OR DESTINATION INFORMATION. THE WRECKAGE WAS LOCATED UNDER A 7 STRAND, 230 KV ELECTRIC TRANSMISSION LINE BY A LOCAL RESIDENT 13 DAYS AFTER THE MISHAP. THE AIRCRAFT HAD ELECTRIC ARC BURN MARKS FROM IMPACT WITH THE ELECTRIC WIRES.