Middle of summer, eight eights blue. Call to the Ops desk, "The airfield she is a closed!" Why? Fog!
Take sqn mini to the met office where I am shown the fog! Turns out that someone has lit a bonfire which has obscured one of the eight visual reference points!
When it is observed that seven other reference points were clearly visible, guess what?
"The airfield she is a open again"
Just one range slot lost!!