Dynamic Visibility
I was at a talk given by a Retired Airline Pilot. He mentioned the term Dynamic Visibility. He went on to say that for example, visibility may be reported as 2000 metres, however if it was raining at the time the visibility on the take-off roll would be reduced due to the impact of water droplets on the windscreen and exacerbated by the forward motion of the aircraft. So in fact the vis may actually be 1500 metres.
I have done a search on this term with no success.Does anybody have any info on this subject?