"If the composite information indicates to a reasonable and prudent pilot that he or she will encounter visible moisture at freezing or near freezing temperatures and that ice will adhere to the aircraft along the proposed route and altitude of flight, then known icing conditions likely exist."

In other words, in addition to there being the potential for icing (moisture and freezing temperatures) the pilot needs to determine that ice will adhere to the aircraft. 

How should a reasonable and prudent pilot determine "that ice will adhere to the aircraft"?   Pilot reports?  Forecasts of icing?

It seems to me that this allows for a lot of retrospective second guessing on the part of the FAA.

D. Brunner