BE55 PLT RECEIVED CLRNC TO CLB INTO CLASS A AIRSPACE ON VFR FLT.

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APR/XA/99; BARON ACFT DEPARTED BIS ENRTE TO HII WITH A PROPOSED FUEL STOP AT CPR. AFTER GETTING A WX BRIEFING AT BIS; WE WERE TOLD IT WAS A PERFECT VFR DAY. MUCH TO OUR SURPRISE; THE WX IN WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING WAS NOT AS PREDICTED. I CALLED FLT WATCH AND WAS TOLD THIS HAD JUST DEVELOPED. IT STARTED SNOWING; THE CLOUDS WERE SCATTERED AND BROKEN AT 6000 FT; 12000 FT; AND 17000 FT. WE WERE ON VFR FLT FOLLOWING AT THIS TIME WITH ZDV. REALIZING THAT WE DID NOT WANT TO GET INTO THE SNOW AND ICE; I NOTIFIED DENVER WE WERE GOING TO GO HIGHER. AT ABOUT 17000 FT WE WERE NOT TOPPING ALL THE CLOUDS; SO I ADVISED DENVER THAT I WAS A VFR PLT ONLY AND COULD I GO TO FL185; AS THAT WOULD PROBABLY TOP THE CLOUDS. DENVER AUTH ME TO ENTER CLASS A AIRSPACE. AT ALL TIMES WE REMAINED VFR. AT ABOUT THIS TIME; ANOTHER BARON CAME ON AND RPTED THE TOPS AT FL220. THE CTLR ASKED ME IF I HEARD THE RPT AND ASKED IF I WANTED TO GO TO FL220 AND GO DIRECT TO GRAND JUNCTION. I WELCOMED THE OFFER. AT ALL TIMES WE COULD SEE THE GND THROUGH THE BROKEN AND SCATTERED CLOUDS. AT ABOUT FL199 I ADVISED CTR THE AIRPLANE WOULD NOT CLB ANYMORE AND ASKED FOR LOWER. DENVER AT THIS TIME CHANGED CTLRS AND AUTH ME TO DSND TO 14000 FT. THINGS WERE GOOD AT 14000 FT UNTIL I WAS ABOUT TO GO IMC. I NOTIFIED THIS NEW CTLR THAT I NEEDED LOWER. THIS CTLR TOLD ME TO STAY AT 14000 FT AS HE HAD TFC DEPARTING FROM CPR. ONCE AGAIN I INFORMED THIS CTLR THAT I WAS NOT IFR RATED AND ABOUT TO GO INTO IMC. I TOLD HIM I WOULD BE TURNING 180 DEGS. HE THEN ADVISED ME TO STAY VFR AND DO WHAT IT TOOK TO STAY THAT WAY. UPON LNDG AT CPR; I WAS TOLD TO CALL ZDV; WHICH I DID. THE SUPVR WAS GOING TO LOOK INTO THE EVENT AND SAID TO HAVE A NICE DAY.