PLTDEV.

Narrative

WE DEPARTED FLL ARPT WITH RADAR VECTORS ORLANDO. OUR INITIAL CLRNC WAS HDG 350 DEGS AND CLB AND MAINTAIN 5000 FT; WE LEVELED OFF AT 5000 FT ON HDG 350 DEGS. AT THIS POINT WE WERE IN AND OUT OF CUMULUS CLOUDS. DEP CALLED US WITH A TA 12-1 O'CLOCK POS; 4900 FT; 5 MI VFR. WE EXITED A CLOUD AT THE SAME TIME DEP GAVE US HDG 030 DEGS FOR TFC. WE STARTED A R TURN TO 030 DEGS WHEN THE FO SAID HE HAD THE TFC AND TO TIGHTEN THE TURN. I PICKED UP THE TFC AT THE SAME TIME; THE OTHER TFC WAS IN A L TURN AT OUR 12:30 O'CLOCK POS; ABOUT 2-3 MI AHEAD AND IN OUR DIRECT FLT PATH. I IMMEDIATELY WENT INTO A STEEP L TURN AND MISSED THE OTHER ACFT BY ABOUT 100 FT VERT AND 3800-4000 FT HORIZ. THE OTHER ACFT WAS APPARENTLY TRYING TO DSND VFR IN AN OPENING OF THE CLOUDS; THE CTLR HAD GIVEN US VECTORS INTO A CONFLICTING FLT PATH WITH THE OTHER ACFT. GOOD COCKPIT RESOURCE MGMNT IN OUR COCKPIT CONTRIBUTED TO OUR GOOD LUCK THIS TIME. THIS SEEMS TO BE A RECURRING PROB WITH A MIX OF VFR TFC AND IFR TFC IN MARGINAL WX CONDITIONS. THIS EVENT HAPPENED SO FAST I'M NOT SURE WHAT TYPE ACFT WE AVOIDED.