THE NON-INSTRUMENT RATED PRIVATE PILOT ENCOUNTERED AN AREA OF THUNDERSTORMS DURING CRUISE FLIGHT. AN EXAM OF THE CRASH SITE REVEALED EVIDENCE OF AN IN-FLIGHT BREAK-UP WITH WRECKAGE SCATTERED OVER A 1000 BY 300 FOOT AREA. LARGE PIECES OF THE AIRPLANE, SUCH AS THE LEFT WING, WERE FOUND MORE THAN 150 FEET TO THE SIDE OF THE MAIN WRECKAGE PATH. NO RECORD WAS FOUND OF THE PILOT RECEIVING A WEATHER BRIEFING BEFORE FLIGHT. WITNESSES STATED THAT AT THE TIME OF THE ACCIDENT, THERE WAS HEAVY RAIN, LIGHTNING, AND REDUCED VISIBILITY IN THE AREA.