PLT OF SMT APCHED SJC CANCELED IFR AND PROCEEDED VFR INTO LOWERING CEILINGS; OBTAINED SPECIAL VFR TO LAND AT PAO.

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AFTER SHOOTING AN ILS TO SJC I BROKE OUT UNDERNEATH; CANCELLED IFR AND REQUESTED A DEP N FOR THE PURPOSE OF VFR FLT TO PAO. SJC WX WAS BARELY VFR; MEASURED 900 FT; SCATTERED AND 3 OR 4; AS I RECALL. PAO WAS MEASURED 900 FT CEILING AND 2 OR 3; MOFFETT ESTIMATED 500 FT CEILING. I HOPEFULLY; AND FOOLISHLY; EXPECTED TO BE ABLE TO COMPLETE THE TRIP NOT LOWER THAN 8 OR 900 FT. I WAS HDOF TO BAY APCH WITH MY ORIGINAL SQUAWK AND PROCEEDED N OF SJC AND NW UP HIGHWAY 680. I WOULD HAVE STAYED ALONG THE BAY SHORELINE WERE IT NOT FOR THE PRESENCE OF SKY SAILING; WHICH I DID NOT WANT TO OVERFLY SO LOW. AFTER CLRING SKY SAILING I TURNED TOWARD PAO. FROM JUST ABOUT THE LESLIE SALT AREA. I REQUESTED A SPECIAL VFR AND LANDED AT PAO. THE ONLY PROBLEM WITH THIS FLT; AND THE REASON FOR THIS RPT; IS THAT I WAS BTWN 500 AND 800 FT FOR PORTIONS OF THE FLT OVER THE FREMONT AREA. I HAD NOT INTENDED TO BE THAT LOW AND WOULD HAVE LANDED AT SJC IF I'D USED BETTER JUDGEMENT. THE MOFFETT CEILING WHICH I DISCOUNTED SINCE IT WAS NOT MEASURED; AND MY OWN AMPLE KNOWLEDGE OF THE LCL WX TRENDS SHOULD HAVE DISCOURAGED ME FROM EMBARKING ON THIS PORTION OF THE FLT.