1. Flying in conditions where the drifting clouds can obscure your horizon instantaneously can be certainly challenging. Furthermore, when the humidity causes haze all over the water, even the fatigue levels will always be on the higher side.
2. Strong, gusty wind conditions will also cause large variation of power demand and corresponding variation of collective. This will demand more attention of the pilot to monitor the torque variations, the Ts and Ps as also the visual cues as in ser 1 above.
The point i wish to make is we need to learn from these potential situations and be away or evading them as much as possible. Once likely to face both the situations together, experience should be used to avoid getting into the situation or exiting as soon as possible, negotiating weather to continue is a totally no-go situation. Not that this pilot did anything wrong, he just helped us to remind us of some important aspects.