Regarding wet runways, there is an FAA SAFO
number 15009 from the end of last year arising from several overrun incidents in rain. It says that: "The data indicates that applying a 15% safety margin to wet runway time-of-arrival advisory data .... may be inadequate in certain wet runway conditions...The root cause of the wet runway stopping performance shortfall is not fully understood at this time; however issues that appear to be contributors are runway conditions such as texture (polished or rubber contaminated surfaces), drainage, puddling in wheel tracks and active precipitation. Analysis of this data indicates that
30 to 40 percent of additional stopping distance may be required in certain cases where the runway is very wet, but not flooded."