PA28 PLT DEVIATES AROUND WX WITHOUT CLRNC IN ZAB AIRSPACE.

Narrative

IFR FLT PLAN V16 TUS-ELP 11000 FT. DEPARTED TUS. WAS ON TOP OF CLOUDS AT 11000 FT UNTIL ABOUT 20 MI E OF TUS VOR. I DIVERTED 3-4 MI S OF V16 AROUND SOME BUILDUPS. I WAS CONCENTRATING ON THE BUILDUP CLOUD FORMATIONS; SO I INADVERTENTLY FAILED TO ASK FOR DEV OR TO INFORM ZAB THAT I HAD DIVERTED. ALSO; I WAS AT 11300 FT WHEN CTLR POINTED OUT THESE THINGS; AND REQUESTED THAT I CORRECT TO THE N TO GET BACK ON AIRWAY (V16) AND TO CORRECT TO MY ASSIGNED ALT OF 11000 FT; WHICH I IMMEDIATELY DID. THEN I REQUESTED 12000 FT; WHICH WAS APPROVED. HOWEVER; WHEN 45 MI SW OF DMN; PICKED UP LIGHT RIME ICE AND PITOT ICE; AND LOST AIRSPD INDICATOR. I IMMEDIATELY NOTIFIED CTLR AND ASKED FOR A DSCNT AND VECTORS TO DMN; WHICH WAS APPROVED. AT 9500 FT; BROKE OUT OF OVCST; AND AIRSPD INDICATOR BECAME FUNCTIONAL. UNEVENTFUL LNDG AT DMN; THEN VFR UNDER OVCST INTO EL PASO; TX. CONCLUSIONS: 1) SHOULD HAVE REQUESTED DEV AROUND CLOUD TOPS. 2) SHOULD HAVE REQUESTED LOWER RATHER THAN HIGHER ALTS TO HAVE AVOIDED ICING IN CLOUDS.