A LEARJET 45 FLC HAS A BREAKDOWN OF COCKPIT CRM.

Narrative

I WAS ACTING AS THE FO; AND ALSO THE PF. WE DEPARTED RWY 8 AT FXE AND WERE FLYING A 090 DEG HDG. SHORTLY AFTER DEP; OUR RADAR WAS PAINTING A LINE OF CELLS EXTENDING ON A N/S LINE. THE CAPT ASKED FOR DEV S OF COURSE FOR THE WX. ATC RESPONDED 'UNABLE' AND 'TURN L HDG 070 DEGS.' THE CAPT THEN QUESTIONED THE HDG AND SAID; 'A S HDG WOULD WORK BETTER FOR US.' ATC RESPONDED THAT THERE WAS A FLOW OF TFC INBOUND TO THE AREA COMING AROUND THE S AND THAT THE SOUTHERN HDG WOULD NOT WORK. WE TURNED TO THE 070 DEG HDG. THE RADAR CONFIRMED THE 070 DEG HDG WOULD TAKE US N OF THE LINE. ATC ADVISED US 'CLRED DIRECT NEW BIGHT WHEN ABLE.' AFTER RECEIVING THIS CLRNC; I ENTERED DIRECT TO NEW BIGHT ON THE SECOND FMS AND LOOKED AT THE COURSE DISPLAY ON THE MFD. IT CONFIRMED THAT A DIRECT COURSE WOULD TAKE US THROUGH THE NORTHERN CELL AND MADE A DIRECT STILL UNSAFE. I DETERMINED WE WOULD NEED A FEW MORE MINS ON THIS HDG BEFORE MAKING THE TURN. AT THIS POINT; THE PIC ASKED WHY I WASN'T TAKING A TURN TO THE S. I REPLIED THAT WE STILL NEEDED A FEW MI ON THIS HDG BEFORE TURNING. HE THEN SAID THAT IF ATC CLRED US DIRECT TO NEW BIGHT; WE COULD DEVIATE S OF THE LINE AND THEN PROCEED DIRECT. A HDG OF 180 DEGS OR SO WOULD BE NECESSARY TO STAY CLR OF THE WX. I THEN QUESTIONED THE STATEMENT AND SAID 'ARE YOU SURE THEY DON'T WANT US TO STAY ON THIS HDG; AND WHEN CLR THEN MAKE THE TURN?' HE SAID NO; AND INSTRUCTED ME TO MAKE THE TURN TO THE S. I WAS UNCOMFORTABLE WITH THIS AND AGAIN QUESTIONED THE TURN WITH HIM. AGAIN HE INSTRUCTED THE SOUTHERN TURN; AT WHICH POINT I TURNED. SOON AFTER THE TURN; ATC ASKED FOR OUR CURRENT HDG. THE PIC REPLIED '170.' ATC THEN PROCEEDED TO INFORM US THAT WAS NOT THE INTENT OF THE CLRNC AND THAT WE SHOULDN'T HAVE MADE THE TURN. I THINK IT IS CLR THAT A BREAKDOWN IN COMS OCCURRED. AS THE FO I WAS UNSURE OF AN APPROPRIATE RESPONSE AND FELT THAT AFTER QUESTIONING THE PIC TWICE; MY RESPONSIBILITY WAS TO COMPLY WITH HIS DIRECTION. LOOKING BACK; I THINK THE BEST COURSE OF ACTION WOULD HAVE BEEN TO QUERY ATC FURTHER BEFORE TAKING ANY ACTION.