From a pilots point of view (yes, I know no one asked for a pilots point of view

), any information you can give us is better than no information at all. Most likely, all we're going to use it for is to decide whether it's worth giving it a try or not. Obviously if we get up there and find it's crap, we'll turn around - but often we'd rather save ourselves the effort, and jump in the car (or go to the pub) if we know in advance that it's crap.
Enzo - as a very-low-hours PPL, I took off with a forecast of 5km vis improving throughout the morning. Sure enough, when I took off, the vis was around 6 or 7km, which was more than enough for me to navigate my way around the local area and head north. I'd read the forecast, and I knew that it would be steadilly improving throughout my flight. Then I lost sight of the M1, which was strange, because the M1 is a bl00dy big road. I realised that I was lost, and followed the procedures I'd been taught when this happened. A few minutes later, and I'd figured out where I was, and realised that the reason I couldn't see the M1 was because the vis had reduced to 2km, and I was about 5km away from it
I diverted safely, and called my flying club to tell them that I wasn't bringing the aircraft back that night. About 1/2 hour later, my instructor called me. The first thing she said to me was "Why didn't you call your destination airfield for a weather report?"
FFF
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