LOW TIME GA PLT ENCOUNTERS ENRTE WX.

Narrative

DEPARTING JYO APPROX XA00; SKIES WERE CLR LESS THAN 12000 FT. I CLBED TO 10500 FT AND HEADED WSW. I WANTED ALMOST DIRECT SW FOR TOUCHDOWN AT PDK; BUT I KNEW THE WX WOULD BE BAD AND I PROBABLY WOULDN'T MAKE IT. HOWEVER; IT APPEARED I COULD GO W OVER THE MOUNTAINS; GET PAST THE FRONT; THEN GO S OR SE TOWARD PDK AS FAR AS POSSIBLE DEPENDING ON THE CEILINGS. AS I WENT W; THE CUMULUS STARTED TO BUILD UNDER ME (TOPS APPROX 8000 FT; HIGHER IN ISOLATED SPOTS). HOWEVER; WITH LOTS OF HOLES; I DIDN'T WORRY TOO MUCH (AND FIGURED I WAS GETTING TOWARDS THE END ANYWAY). HOWEVER; AS I PASSED OVER THE MOUNTAINS; THE CLOUDS GOT THICKER; RATHER THAN THINNER. I KEPT ALTERING COURSE FURTHER NNW; WHERE I COULD SEE BLUE SKIES. HOWEVER; I ULTIMATELY REACHED THE POINT WHERE I ONLY HAD 1/2 HR OF FUEL; AND NO END IN SIGHT OF THE CLOUDS. I USED THE GPS/NEAREST FEATURE AND MANAGED TO FIND 1 ARPT WITH 1) RELATIVELY FLAT SURROUNDING LANDSCAPE AND 2) 1400 FT CEILINGS (HIGHEST RPTED IN A 50 MI RADIUS). I USED THE AUTOPLT TO DSND TO 1400 FT (WHILE CIRCLING WITH THE HEADING BUG) AND DID A VISUAL APCH AT 2AO. (WHERE I SAT FOR ANOTHER DAY WAITING FOR AN IFR-RATED PLT TO GET ME HOME.) ALTHOUGH ALL WX PREDICTIONS (SEVERAL SOURCES) I CONSULTED INDICATED A DEFINITE WESTERN EDGE TO THE FRONT; IT OBVIOUSLY BUILT IN A WAY NOT PREDICTED BY THE MODELS. I SHOULD HAVE PUT DOWN (AFTER DOING A 180 DEG TURN) AS SOON AS THE CLOUD COVER BELOW ME GOT EVEN CLOSE TO MARGINAL AND NOT TRUSTED PREDICTIONS.