C182 PVT PLT ENTERS BFL D AIRSPACE WITHOUT AUTH AS IT GOES IMC WITH 2 PT 5 MI VISIBILITY RPTED. RPTR HAD LEFT L45 JUST S OF BFL WITH THE ATIS RPTING 4 MI VISIBILITY.

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MY ACFT WAS ON THE GND AT L45 PRIOR TO A POSITIONING FLT TO BFL. ON THE GND AT L45 I LISTENED TO THE CURRENT BFL ATIS INFO WHICH WAS CLR; 4 MI IN HAZE. I TAXIED FOR TKOF ON L45 RWY 34. IMMEDIATELY AIRBORNE I CONTACTED THE BFL TWR STATING MY INTENTIONS FOR LNDG AND THE CURRENT ATIS INFO CODE. THE TWR RESPONDED WITH MY CALL SIGN; BUT NO FURTHER INSTRUCTION. I CONTINUED TOWARDS BFL. THE CTLR INFORMED ME (ONCE INSIDE THE D AIRSPACE) THAT THE FIELD WAS IFR AS VISIBILITY HAD DROPPED TO 2 1/2 MI. HE ASKED MY INTENTIONS. I REQUESTED A SPECIAL VFR CLRNC FOR LNDG. I CONTINUED TOWARDS THE ARPT; BUT RECEIVED NO SUBSEQUENT COM TO A POINT WITHIN ABOUT 2 NM OF ARPT. AT THIS POINT I SIMULTANEOUSLY TURNED W AWAY FROM ARPT AND ASKED THE CTLR IF I WAS CLRED TO APCH THE ARPT FOR LNDG. AT THIS POINT HE ISSUED THE SPECIAL VFR CLRNC; BUT APPARENTLY SAW MY TURN ON HIS RADAR SCOPE AND QUERIED WHETHER I WAS LNDG AT BFL. I SAID I WAS GOING TO LAND AT BFL AND TURNED TOWARDS THE ARPT; BUT I HAD BECOME SOMEWHAT DISORIENTED AND FLEW PAST THE ARPT. THE CTLR PROVIDED A HEADING BACK TO THE ARPT AND I LANDED UNEVENTFULLY. I THINK THIS PROB HAPPENED AS THE UNLIKELY RESULT OF EVENTS: 1) WX CHANGED OVER A SHORT PERIOD (CAUSING THE ISSUANCE OF A SPECIAL OBSERVATION); 2) AN EXTREMELY SHORT FLT ORIGINATING JUST OUTSIDE OF THE D AIRSPACE. HAD THE CTLR RESPONDED ON HIS FIRST XMISSION THAT THE FIELD HAD JUST GONE IFR; I WOULD HAVE TURNED TO A WESTERLY HEADING TO AVOID THE D AIRSPACE AND WORK OUT THE APCH CLRNC. HAVING ESTABLISHED RADIO CONTACT AND OPERATING WITH THE RECORDING I HAD HEARD MINS EARLIER AS 4 MI I ASSUMED NO PARTICULAR PROB. HOWEVER I SUSPECT THE WX HAD JUST CHANGED AND THE POP UP PLUS THE WX CHANGE CAUGHT THE CTLR OFF GUARD. I THINK IT UNREASONABLE TO EXPECT A CTLR TO PERFORM DIFFERENTLY. PERHAPS REQUIRING ALL CONTACTS TO GO THROUGH APCH CTL FIRST; OR ADJUSTING AIRSPACE SO THAT NEARBY SATELLITE ARPTS TO D AIRSPACE ARE CTLED BY THE PRIMARY TWR WOULD HELP.