ACR B190 FLC ENTERS L TFC ON VISUAL APCH. TWR TIRES TO SEQUENCE PA28 IN R TFC TO FOLLOW THE B190. THE B190 FO SEES THE PA28 HEAD-ON ON FINAL; OPPOSITE DIRECTION; AND INITIATES EVASIVE ACTION. THE PA28; APPARENTLY CONFUSED AND DISORIENTED; ALSO TAKES EVASIVE ACTION.

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WE WERE DSNDING ON A VISUAL APCH FROM THE NW; TO RWY 32; RPTING A L MIDFIELD DOWNWIND TO RWY 32. THE VISIBILITY WAS MARGINAL -- HAZE AND MIST. VERT VISIBILITY WAS GOOD. AS WE APCHED THE AERODROME; WE HEARD THE TWR CTLR GIVING VECTOR INSTRUCTIONS TO AN INBOUND CHEROKEE. THE CHEROKEE SEEMED TO BE FAMILIAR WITH THE LCL ARPT; HAD THE ARPT IN SIGHT; BUT COULDN'T SEE ANY OTHER TFC IN HIS VICINITY. THE TWR GAVE HIM SEVERAL VECTORS IN A SHORT AMOUNT OF TIME; THAT MUST HAVE CONFUSED HIM. HE WAS TOLD TO LOOK FOR A TWIN CESSNA (402 TYPE?) AND A BEECH 1900D. HE WAS TO BE FOLLOWING US; IN THE BEECH; TO RWY 32 -- ONLY HE WAS COMING IN FROM THE E AND ON A R DOWNWIND TO RWY 32. WE WERE VIGILANT FOR THIS OTHER ACFT AS WE TURNED OUR L BASE FROM 1500 FT AGL; DSNDING. AT 1000 FT AGL; I CALLED '1000 FT TO THE FIELD.' CAPT THEN CALLED FOR 'FINAL LNDG ITEMS.' I PROCEEDED TO RUN THE CHKLIST. AS THE CAPT TURNED FINAL; HE WAS LOOKING OUT THE L WINDOW AT THE RWY. I LOOKED FORWARD TO SEE THE CHEROKEE AT 12 O'CLOCK POS AND THE SAME ALT; COMING HEAD-ON. I SAID 'LOOK OUT;' AND I MANAGED TO TAKE THE CTLS AND BANK THE ACFT TO THE R TO MISS THE CHEROKEE. I THINK HE SAW US AT THE SAME TIME AND BANKED TO HIS R. THE TWR HAD NO IDEA HOW CLOSE WE WERE. I THINK THE TWR WAS FRUSTRATED WITH THE LACK OF VISIBILITY AND TOLD THE CHEROKEE TO DEPART THE PATTERN UNTIL HE COULD SEE THE TFC AS POINTED OUT BY THE TWR.