VFR C500 LNDG SUN ENCOUNTERS IMC.

Narrative

I HAD PLANNED TO FLY PAX FROM SLC TO SUN. WHILE ENRTE; IT BECAME CLR THAT SUN WAS BELOW LNDG MINIMUMS; SO I DIVERTED TO TWF. MY JOB WAS TO DELIVER THE ACFT TO SUN AS SOON AS WX PERMITTED AND TO LEAVE IT IN A STORAGE HANGAR. AFTER ABOUT 2 HRS HAD PASSED; SUN WAS RPTING 1800 FT BROKEN CEILING AND ABOUT 5 MI VISIBILITY. I THEN DEPARTED TWF VFR; WITHOUT PAX; FOR THE 55 NM TRIP UP TO SUN. I FLEW SLIGHTLY E FOR 10 MI; THEN DUE N TOWARDS WTSOX INTXN AT ABOUT 6500 FT. SINCE THE VISIBILITY ENRTE WAS SLOWLY DECREASING FROM ABOUT 10 TO 5 MI; I SET MY RADAR ALTIMETER FOR A 1000 FT WARNING AND SLOWED THE ACFT TO A COMFORTABLE 130 KTS. AT ABOUT 15 NM S OF INTXN W; THE TWR RPTED GOOD VISIBILITY AND 'FEW' CLOUDS AT 800 FT; WITH A HIGH OVCST ABOVE.; HOWEVER; THE VISIBILITY BTWN ME AND THE ARPT BECAME LESS; IN A HURRY (4 MI; 3 MI); WHEREAS; I HAD DIAGNOSED THE WX AS 'HAZE.' I BRIEFLY ENTERED A SMALL CLOUD. BECAUSE OF THIS; I IMMEDIATELY INITIATED A CLB AND REVERSED MY COURSE IN ORDER TO RETURN TO TWF. WITHIN A 300 FT CLB AND ABOUT 15 SECONDS; I WAS IN THE CLR AGAIN; YET DISAPPOINTED WITH MY PERFORMANCE. I DID NOT INTEND TO ENTER A CLOUD (IMC) WHILE OPERATING VFR. I CALLED SALT LAKE CTR; WHO INDICATED A LONG DELAY FOR AN APCH. 90% OF MY OPS ARE CONDUCTED IFR. THIS PARTICULAR AFTERNOON; I DECIDED TO GO VFR; BECAUSE THE FLT WAS SUPPOSED TO TAKE 14-16 MINS; THE VISIBILITY WAS PORTRAYED TO BE VFR; AND ZLC NORMALLY CANNOT PROVIDE RADAR SVCS BELOW ABOUT 12000 FT. IN RETROSPECT; I SHOULD REALIZE THAT THE IMAGE OF CLOUDS AND VISIBILITY THAT I 'PAINT' IN MY MIND BY STUDYING RPTS AND FORECASTS CAN BE INACCURATE; EVEN ACROSS A SHORT RTE SEGMENT. ALSO; THE FACT THAT HAZE CAN HIDE CLOUDS; ESPECIALLY WHEN VISIBILITY IS LESSENED TO 3 MI OR LESS; SHOULD BE APPRECIATED. AFTERWARDS; I LEARNED THAT CONDITIONS AT SUN HAD GONE FROM MARGINAL TO 1-2 MI VISIBILITY IN SNOW; TO CLR THROUGHOUT THE AFTERNOON. NO MATTER HOW FAMILIAR I AM WITH THE PLAINS S OF SUN; I WILL PREFER TO FLY ONLY IFR IN THE FUTURE.