THE PILOT RECEIVED THREE WEATHER BRIEFINGS AT VARIOUS POINTS THROUGHOUT THE PREFLIGHT, FLIGHT AND PRIOR TO THE FINAL DEPARTURE FROM ANDREWS, NORTH CAROLINA. EACH BRIEFING NOTED INSTRUMENT WEATHER CONDITIONS ALONG THE PILOT'S ROUTE OF FLIGHT. ADDITIONALLY, THE PILOT REQUESTED AND WAS GIVEN A RADAR ASSIST INTO ANDREWS MURPHY AIRPORT, FROM ATLANTA CENTER, ABOUT AN HOUR BEFORE THE ACCIDENT. AFTER REFUELING WITH 16 GALLONS OF AVIATION FUEL, THE PILOT DEPARTED ANDREWS MURPHY AIRPORT AND CLIMBED TO ABOUT 6600 FEET. ATLANTA CENTER RADAR RECORDED AN AIRBORNE TARGET CIRCLING IN THE VICINITY OF THE ACCIDENT SITE AT 6600 FEET. HIKERS ON THE APPALACHIAN TRAILS RECALLED HEARING AN AIRPLANE IN THE VICINITY OF THE ACCIDENT SITE AT THE APPROXIMATE TIME OF THE ACCIDENT. THEY ALSO REPORTED THAT FORWARD VISIBILITY WAS REDUCED TO ABOUT 50 YARDS WITH MODERATE RAIN. A FOREST RANGER REPORTED THAT WINDS WERE GUSTING TO ABOUT 45 MPH. NO MECHANICAL PROBLEMS WERE DISCOVERED DURING THE WRECKAGE EXAMINATION.