Cloudy conditions does not matter much in ODIs in ENG for last 2/3 years. Question was about the wicket, was wicket dryer and had moisture? Almost all wickets have been dryer under the cover(thanks to their drainage and drying system), except ENG Vs AUS, you could see the ball was nipping a lot in first 15-20 overs, even in AUS innings nip was there, Morgan decision was right...
You have to judge hardness and dryness of the surface rather than looking at clouds and rain in last few days, which has little to no barring. 90% of the time in this WC, wickets has been bat first. Even NZ made right call, second time it was way harder to bat...PAK did this twice against top team, which is very unfortunate. These guys are in UK for 2 months, have no idea how to read pitches, I don't know what is point of 5/6 coaches, plus supporting staff. You have to be clinical about conditions, toss has and will play huge role in this WC.
Weather will be dryer and if it get hotter, toss will be even more vital. I am pretty sure, ENG/ICC is not going to start making damp wickets now, that gamble has its down sides