PRIOR TO DEPARTING NEW BERN AT 1837 THE PLT CALLED HIS OFFICE & STATED HE HAD RECEIVED A WX REPORT FOR SCATTERED THUNDERSTORMS ALONG HIS ROUTE OF FLT. AT 2020 & 2052 HE CONTACTED ATL FLT WATCH FOR WX ADVISORIES. HE WAS ADVISED THAT THE WX RADAR WAS OUT OF SERVICE BUT RADAR SUMMARY CHARTS INDICATED HE MIGHT ENCOUNTER RAIN SHOWERS & THUNDERSTORMS IN THE AREA OF TOCCOA & HARRIS VOR. AT 2105 THE PLT CALLED FLT WATCH AGAIN & REPORTED ENCOUNTERING IFR. FLT WATCH REPLIED THEY DID NOT HAVE RADAR AVAILABLE & TO CONTACT ATL CENTER. THE PLT DID NOT ACKNOWLEDGE & FURTHER ATTEMPTS TO CONTACT THE PLT WERE UNSUCCESSFUL. THE ACFT CRASHED IN A NEAR VERTICAL ATTITUDE. AT THE TIME THE PLT CONTACTED FLT WATCHHE WAS NOT PROVIDED PERTINENT INFORMATION FROM THE AREA FORECAST FOR CLOUDS AT 2,000-3,000 FT SCATTERED VARIABLE BROKEN WITH A CHANCE OF CEILINGS/VISIBILITIES AT OR BELOW 1,000 FT & 3 MI IN THUNDERSTORMS WITH MODERATE RAIN SHOWERS.