I wouldn't go for no hazard at all.
As I said the brown side of weird stuff happening. Plus quiet often your inside cloud when it starts happening which is lovely until you look down an see that 5 kts of airspeed have gone because of airframe icing.
As said GPS's start giving up.. Radios can stop receiving because the auto sqwelch has increased so much that the signal you actually want to listen to is muted as well.
Your not suddenly going to drop out of the sky when you see it.... but be prepared for weird stuff to start happening.