DIVERT LAND DUE TO AIRFRAME ICING.

Narrative

I WAS FLYING FROM PHILADELPHIA; WINGS (N67) TO BENEDUM (CKB) ENRTE HOME TO NASHVILLE. MINS BEFORE MY IFR WX BRIEFING I HAD JUST FINISHED GETTING 'GRILLED' IN A LEGAL DEPOSITION. I WAS ANXIOUS TO LEAVE PHILADELPHIA. I REMEMBER HEARING ABOUT POSSIBLE RIME ICE BUT; IN MY EXPERIENCE; IF THAT STARTS IT IS USUALLY SLOW TO FORM AND SIMPLE TO AVOID. THE BRIEFER DISCUSSED THE AREA OF ICING IN TERMS OF AN AREA BOUNDED BY CITIES WHICH I BASICALLY COULD NOT READILY RELATE TO MY RTE. I DEPARTED; CLBED TO 8000 FT AND WAS CRUISING IN THIN CLOUDS; CAUTIOUSLY CHKING EVERY 2 MINS FOR ICE. ABOUT 1 HR INTO FLT I NOTED WHAT APPEARED TO BE A LIGHT ACCUMULATION OF RIME. I WAS DECIDING ABOUT REQUESTING A NEW ALT WHEN I NOTED A SLIGHT GREENISH TINT TO THE STRUT LEADING EDGE. I LOOKED HARD AND IT DIDN'T APPEAR TO BE ICE; I GUESSED IT WAS AN EFFECT OF SUNLIGHT IN THE CLOUDS. NEXT I NOTED THE AIRSPD DECREASE; THE ENG CHKED OUT OK; IT WAS ONLY THEN I REALIZED THERE WAS SERIOUS ICING. I IMMEDIATELY INFORMED BALTIMORE APCH AND REQUESTED THE NEAREST ILS APCH. THEY VECTORED ME TO 'MARTIN STATE.' FOR SOME REASON I COULD NOT FIND IT IN MY NOS PLATES; THIS LED TO MINS OF CONFUSION; AND I JUST REQUESTED THE APCH NUMBERS. (LATER ON THE GND; I FOUND THAT MARTIN IS LISTED UNDER B FOR BALTIMORE). I MADE A NO-FLAP; HIGH SPD APCH; LANDED EASILY; GOT OUT AND FOUND ABOUT 1/4 INCH OF TRANSPARENT ICE ON THE STRUTS AND LEADING EDGES. PLTS SHOULD AVOID ICE! MY JUDGEMENT MAY HAVE BEN AFFECTED BY THE UPSETTING EXPERIENCE I HAD JUST HAD BEFORE COMING TO THE ARPT. VERBAL DESCRIPTIONS OF AREAS MAY AS WELL BE IN GREEK. MAYBE SOMEDAY A PLT CAN RECEIVE A GRAPHIC PICTURE OF AREA IN AIRMETS. ICE CAN BE TRANSPARENT. I'VE SEEN LOTS OF PICTURES OF ICE ON WINGS WITH BIG RAGGED EDGES. WHAT I HAD LOOKED NOTHING LIKE THAT. BRIEFERS CAN BE VERY HELPFUL. THE ONE I SPOKE TO AFTER LNDG RECOMMENDED A RTE FIRST TO THE S; THAT TOOK ME RAPIDLY TO ABOVE FREEZING TEMPS AND EVENTUALLY TO CLR CONDITIONS. I WILL ALWAYS ASK IN THE FUTURE WHEN IN A SIMILAR SIT.