AN MD83 NBOUND AT FL250 AND DEVIATING FOR WX HAS LOSS OF SEPARATION WITH AN L1011 AT THE SAME ALT. THE CTLR ATTEMPTED TO MAINTAIN LEGAL SEPARATION BY VECTORING BOTH ACFT; BUT THESE ACTIONS WERE TOO LATE.

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WE WERE DEVIATING TO THE W OF THE JLI VOR AT FL250 PER ATC'S INSTRUCTIONS DUE TO WX OVER THE JLI VOR. WE HAD THE R PACK INOP WHICH LIMITED US TO A MAX ALT OF FL250. AS WE WERE CIRCUMNAVING THE BUILDUPS; WE RECEIVED A CONTACT AT 12 O'CLOCK; CO-ALT. WE VISUALLY PICKED UP THE ONCOMING JET AND TURNED R; AS DID THE OTHER JET; PASSING WELL OUTSIDE OF A MI. SUPPLEMENTAL INFO FROM ACN 412781: WITH MANY TSTMS SE THROUGH NE OF LAX; WE HAD DEVIATED TO THE W OF THE JLI VOR. OUR ALT WAS FL250. TFC AT OUR 12 O'CLOCK POS WAS NOTED AT 6 MI; SAME ALT ON TCASII. SHORTLY THEREAFTER; VISUAL CONTACT WAS MADE AND VISUAL SEPARATION TURNS TO THE R WERE COMMENCED BY BOTH ACFT. THE ACFT PASSED ABEAM EACH OTHER AT APPROX 1-2 MI. HIGH VOLUME TFC IN CONJUNCTION WITH DEVS FROM MOST ACFT IN THE AREA PLAYED A KEY ROLE IN THIS INCIDENT TAKING PLACE. SUPPLEMENTAL INFO FROM ACN 412775: LARGE LINE OF TSTMS SAN TO LAS. SEVERAL ACFT ON WX DEV AROUND TSTMS. ATC TOLD US TO PROCEED DIRECT TO BZA FROM OUR HDG OF 150 DEGS. MD80 (ACR X) WAS HDG N WHEN TCASII TA FOR 2 SECONDS; THEN RED RA SHOWED OTHER ACR X AT 12 O'CLOCK AND APPROX 12 MI WITH INSTRUCTION TO DSND. THEN CTR TOLD US TO TURN 30 DEGS R AND ACR X TO TURN 50 DEGS R. I CLICKED OFF AUTOPLT AND ROLLED INTO 30 DEG BANK TO THE R AS WE OBTAINED VISUAL ON THE MD80. TCASII PERFORMED AS ADVERTISED; HOWEVER; SINCE WE HAD VISUAL ON OTHER ACFT; WE ELECTED TO REMAIN LEVEL RATHER THAN COMPLICATE THINGS FOR THE CTLR. THE CTLR WAS DEFINITELY DOWN THE TUBE (BEHIND THE EIGHT BALL) AND COULD HAVE NEEDED SOME HELP. ALSO; LAX IS NOT USED TO BAD WX AND LOTS OF ACFT DEVIATING.