1. Vis 20 Km plus.
2. No snow showers in area.
And there's the rub Prospector. On my one and only trip to the ice as SLF we were flying in the high teens in what I took to be solid IMC. On looking down I could see what I took to be (after some deliberation) lakes of melt water. It took some time to realise that what I was seeing were the shadows of isolated puff ball clouds on the snow surface. The weather, I would guess, would have qualified as CAVOK. The vertical visibility to the shadows was gin clear so who knows what the horizontal visibility might have been. The overcast turned out to be in the low 20's. You would not have seen a snow shower until you had flown into it. Whiteout? Dangerous stuff for the uninitiated and inexperienced.