"Possible Tornado Touches Down in Brooklyn and Queens"

Story here.  "Only a possible tornado?  It is the actual ones that worry me." 

"Did you hear about Jack? He died of an apparent heart attack."  "Wow, hs heart must have been in terrible condition if all it took was an apparent heart attack to do him in."

Bad jokes, no doubt, but they do get us thinking about the various senses of 'possible' and 'apparent.'  How many of each are there?