INFLT WX ENCOUNTER ON VFR FLT.

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WE DEPARTED FLL ON APR/TUE/95 VFR FOR BOCA RATON; (BCT). WX AT DEP TIME WAS 2000 FT SCATTERED; ESTIMATED 3000 FT OVCST; VISIBILITY 3 MI; LIGHT RAIN 76/73 040/12 ALTIMETER 29.92.A CHK WITH FSS PRIOR TO TKOF SHOWED PBI TO BE RPTING MEASURED 3700 FT BROKEN 5000 FT OVCST VISIBILITY 10 KTS PLUS 360/15 GUSTY 19 KTS ALTIMETER 29.90 AND IMPROVING. TWR CLRED US FOR VFR TKOF WHILE AN AIRLINER AND COMMUTER WERE AWAITING MIAMI IFR RELEASE. AFTER TKOF AND TURNING N FOR BOCA; IT BECAME CLR LOOKING AT OUR RADAR THAT VFR TO BCT WAS NOT POSSIBLE. WE CALLED DEP AND REQUESTED TO RETURN TO FLL. HE ADVISED US TO REMAIN CLR OF CLASS C AIRSPACE AND CONTACT MIA. WE COMPLIED AND MIA APCH STATED FLL HAD JUST GONE IFR. WE REQUESTED AND RECEIVED AN IFR CLRNC TO RETURN TO FLL. DURING THIS; AN AIRLINER RPTED WE HAD DEPARTED VFR IN IFR CONDITIONS. THIS WAS UNTRUE. HE CONTINUED TO STATE HE WOULD VIOLATE US. WHEN WE LANDED AT FLL WE ADVISED GND CTL OF OUR STATUS AND HE STATED HE WOULD PASS THE INFO ON. THE FLT TO BCT FROM FLL TAKES APPROX 4 MINS AND WE MAKE THIS TRIP APPROX 100 TIMES A YR. THE AIRLINER PLT SEEMED UPSET THAT WE WERE CLRED TO TKOF PRIOR TO HIS CLRNC IFR.