NMAC.

Narrative

I APCHED FROM THE SW; CONTACTED THE TWR WITH ATIS; AND WAS TOLD TO RPT ON L DOWNWIND FOR RWY 29. A TSTM WAS TO THE S OF THE FIELD NEAR THE APCH END OF RWY 29 AS WELL AS OTHER SCATTERED STORMS AND RAINSHOWERS. I WAS #2 ON DOWNWIND WITH A COMPANY 206 IN FRONT (NO VISUAL CONTACT) AND COMPANY 206 BEHIND (HE HAD VISUAL CONTACT ON ME). A COMMUTER BRASILIA RPTED A 3 MI FINAL FOR RWY 29. NO VISUAL CONTACT WAS MADE BTWN ANY OF THE TFC AND TWR LOST VISUAL CONTACT WITH MOST TFC AS RAIN WAS MODERATE TO HVY S OF THE RWY. EXTENDING DOWNWIND; FORWARD VISIBILITY DEGRADED TO 1/4 - 1/2 MI. I BELIEVE THE BRASILIA WAS CLRED TO LAND AND THE 206 AHEAD OF ME ON DOWNWIND WAS TOLD TO FOLLOW THE BRASILIA. TRYING TO KEEP VISUAL CONTACT WITH THE END OF RWY 29 AND WITH FORWARD VISIBILITY TOO LOW TO SEE OTHER TFC; I ESTIMATED THE TIME IT WOULD TAKE THE BRASILIA TO MAKE THE RWY (THE COMPANY TFC AHEAD DID THE SAME AFTER TALKING TO HIM AFTERWARD); I TURNED L BASE. THE COMPANY TFC FOLLOWING ME THEN XMITTED ON TWR FREQ 'NXXX DIVE -- YOU'VE GOT A BRASILIA OVER YOU.' AT THIS POINT I DID A QUICK DSNDING L TURN AS EVASIVE ACTION. I TURNED AND HEADED DIRECTLY OVER RWY 04- 22 TO AVOID RWY 29; APCH PATH. THE COMPANY TFC IN FRONT OF ME ENDED UP IN FRONT OF THE BRASILIA ON FINAL. THE BRASILIA BROKE OFF THE APCH CLBING TO THE R AND WAS TOLD TO GAR BY TWR. I ASKED FOR AND RECEIVED A L DOWNWIND FOR RWY 04 AND WAS THEN CLRED TO LAND RWY 04 AND LANDED. THE WIND WAS LIGHT AND VARIABLE. I FIND IT HARD TO BELIEVE THAT; GIVEN THE WX CONDITIONS; THE BRASILIA HAD VISUAL CONTACT WITH THE RWY WHEN ASKING FOR AND RECEIVING A VISUAL APCH TO RWY 29. I ALSO BELIEVE HE WAS MUCH FARTHER OUT THAN 3 MI; WHEN HE RPTED SO. I ALSO FEEL THE TWR SHOULD NOT HAVE USED RWY 29 FOR LNDGS WITH THE STORM AT THE APCH END. THE OTHER END OF THE FIELD WAS RPTED AS GOOD VISIBILITY BY ANOTHER PLT. WHEN ALL OF THIS OCCURRED; THE TWR CTLR FINALLY HAD OTHER VFR INCOMING TFC HOLD VFR OUTSIDE THE ATA. I FEEL THIS COULD HAVE BEEN AVOIDED BY; 1) ASKING FOR AN APCH TO ANOTHER RWY; 2) IF THIS ARPT HAD RADAR SVCS.