SMA FLIES TOWARD STATIONARY FRONT WHICH STARTS TO MOVE. MAKES 180 DEG TURN TO LAND NEARBY ARPT.

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RTE OF FLT: (M035-TOP-PWE-YKN). ABOUT XX00 I CALLED THE COLUMBIA FSS AND RECEIVED A WX BRIEFING. THE BRIEFER INFORMED ME THAT THERE WAS A STATIONARY COLD FRONT W OF OLU AND THAT THERE WERE NO FLT PRECAUTIONS ALONG MY RTE OF FLT. I DEPARTED M085 AT XX40 AND CLBED TO 6500 MSL. I REMAINED AT THIS ALT UNTIL XING THE PWE-VOR; AT THIS TIME I COULD SEE LOWER LAYER OF CLOUDS AND BEGAN DSNDING TO 4500 MSL. WHILE DSNDING I CONTACTED COLUMBUS FSS TO GIVE A POS RPT AND GET AN ENRTE WX BRIEF. THE PERSON AT FSS RECOMMENDED THAT I LAND AT THE NEAREST ARPT BECAUSE THE WX HAD DETERIORATED TO WHERE VFR WAS NOT RECOMMENDED AND SUGGESTED THAT BIE WOULD BE A GOOD ARPT TO LAND AT. AT THAT MOMENT IT STILL LOOKED LIKE IT WOULD BE POSSIBLE TO CONTINUE VFR. I LEVELED OFF AT 4500 MSL FOR A FEW SECONDS AND THEN BEGAN DSNDING WITH THE INTENTION OF CONTINUING AT 3000 MSL; INSTEAD I HAD TO DSND TO 2000 MSL TO REMAIN IN VFR CONDITIONS. AT THIS TIME I DECIDED TO LAND AT BIE AND TURNED TO A HDG OF 270 DEG AND PUT IN THE FREQ FOR THE BIE-VOR. I WAS STILL ON THE FREQ WITH FSS AND BEFORE I COULD CONTACT THEM; THE FSS BRIEFER ASKED MY INTENTIONS AND I INFORMED HIM THAT I WAS GOING TO LAND AT BIE. THIS TOOK PLACE IN ABOUT 3 MINS. I REMAINED IN CONTACT WITH FSS WHILE ENRTE TO BIE. WHILE ENRTE TO BIE I FLEW BTWN 1900-2000 MSL; VISIBILITY VARIED BTWN 1/2 TO 1 MI. TWICE I LOST VISUAL CONTACT WITH THE GND FOR FEW SECONDS; BUT THE REMAINDER OF THE FLT I HAD VISUAL CONTACT WITH THE GND. IT TOOK ABOUT 10 MINS TO ARRIVE AT BIE AND VISIBILITY AT THE ARPT APPEARED TO BE ABOUT 3/4 TO 1 MI. I LANDED AT BIE AT APPROX XY10 WITH 3 HR 30 MIN FUEL ON BOARD. THE LAST 5 MINS OF THE FLT; AT THE REQUEST OF FSS; I SQUAWKED 7700 ON THE TRANSPONDER. AFTER LNDG AT BIE I CONTACTED COLUMBUS FSS BY PHONE AND GAVE THE BRIEFER THE INFO HE REQUESTED. HE WAS FILING AN ACFT SAVED FORM. AFTER HAVING A WX BRIEFING THAT HAD N9O FLT PRECAUTIONS ALONG MY RTE OF FLT I WAS SURPRISED THAT THE WX HAD CHANGED TO SUCH A DEG THAT I COULD NOT DIVERT AROUND IT OR TURN 180 DEG AND FLY OUT OF IT. ONLY 15-20 MINS PRIOR I HAD BEEN FLYING AT 6500 MSL; THOUGH THERE WAS AN OVCST AT A HIGHER ALT. THE BRIEFER AT COLUMBUS FSS GAVE ME THE IMPRESSION THAT I COULD NOT DIVERT OR TURN 180 DEG AND FLY OUT OF IT. I THEN PROCEEDED TO THE CLOSEST ARPT AS THE BRIEFER HAD SUGGESTED. IN MY PHONE CONVERSATION WITH THE BRIEFER AT COLUMBUS FSS; HE STATED THAT THE STATIONARY FRONT HAD STARTED MOVING AND THAT THEY HAD NOT FORECAST IT TO MOVE IN THIS PERIOD OF TIME.