A VFR PLT BASED IN THE POTOMAC ADIZ EXITED THE ADIZ VFR THEN ENTERED THE ADIZ WITHOUT CLRNC WHILE AVOIDING WX.

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CONTACTED POTOMAC CLRNC; RECEIVED SQUAWK CODE; CIRCLED W50 UNTIL RADAR CONTACT WITH POTOMAC APCH; ATC CANCELED UPON EXITING ADIZ. FREDERICK AREA WX WORSE THAN EXPECTED; LANDED AT FDK; REFUEL; WAITED FOR WX TO CLEAR; DEPARTED 45 MINS LATER. AFTER TKOF; MADE TWO ATTEMPTS TO CONTACT FSS TO ACTIVATE FLT PLAN BUT UNSUCCESSFUL (STATIC). CUMULUS CLOUDS IN THE GENERAL AREA WITH CUMULONIMBUS CLOUDS OFF MY RIGHT WING WAY (20+ MILES AWAY). CHOSE TO DEAL WITH THE WX ISSUES FIRST AND CONTACT FSS LATER TO ACTIVATE FLT PLAN. MONITORED POTOMAC APCH ON RADIO #1; RADIO #2 WAS ON THE GUARD CHANNEL. I NEVER HEARD ANYONE 'ANNOUNCE' AN ACFT WAS ABOUT TO OR HAD VIOLATED DC ADIZ AIRSPACE. HEARD NUMEROUS COMMERCIAL AIRLINERS REQUESTING PERMISSION TO CHANGE HDG/ DIRECTION TO AVOID 'CELL ACTIVITY.' AROUND WINCHESTER; VA; CHANGED HDG NUMEROUS TIMES TO MAINTAIN VFR; FSS CAN VERIFY WX CONDITIONS ALONG MY RTE OF FLT. CONVECTIVE WX NORTH OF THE LINDEN VOR FORCED ME TO CHANGE HDG MORE TO THE SOUTH; BUT ONLY BRIEFLY. FLYING A WESTERLY HDG WAS NOT AN OPTION. NORTH OF FLATROCK VOR; CONTACTED WASHINGTON CTR FOR 'FLT FOLLOWING.' AFTER ANSWERING A FEW QUESTIONS (DEST/DEP); WAS ISSUED SQUAWK CODE AND TOLD THAT FAA WANTED ME TO CONTACT THEM IMMEDIATELY UPON LNDG. AT 60J; CALLED ON PHONE; WAS TOLD I HAD VIOLATED ADIZ AIRSPACE BY 1 TO 1.5 MILES. EXPLAINED THAT TO THE BEST OF MY KNOWLEDGE I DID NOT THINK I HAD. TO MAINTAIN VFR; HAD TO CHANGE HDG WHILE IN THAT GENERAL AREA. CONVECTIVE WX AT 8500 FT MSL REQUIRED MY FLYING THE PLANE NOT LOOKING AT LANDMARKS ON THE GND; THAT I RESPECT AND UNDERSTAND THE IMPORTANCE OF THE ADIZ BUT ENTRY WAS UNINTENTIONAL. MY ACFT HAS A TIE DOWN SPACE INSIDE THE DC ADIZ AT ZZZ1. OVER THE PAST THREE YEARS I HAVE FLOWN OUT OF AND BACK INTO THE ADIZ OVER 100 TIMES; HAVE ATTENDED NUMEROUS PLT GROUP SPONSORED SAFETY MEETINGS; READ AND AM FAMILIAR WITH ALL FAA NOTAMS REGARDING FLYING IN THE DC ADIZ. IF I DID VIOLATE THE DC ADIZ; IT WAS VERY BRIEF AND DONE ONLY TO AVOID CONVECTIVE WX. PRIOR TO CONTACTING WASHINGTON CTR FOR 'FLT FOLLOWING;' I HAD TRIED MULTIPLE TIMES TO CONTACT POTOMAC APCH FOR THE SAME SERVICE; BUT THEY WERE TOO BUSY AT THE TIME TO ACCOMMODATE ME.