Whilst we are on the subject of TAFs, I thought that as a general rule of thumb, it was a condition changing for the worst that was mentioned in a PROB/TEMPO.
I don't have the TAF to hand, but yesterday morning when I checked EGKK to see if it was worth going out for a trip around Sussex, It had something like this in it: "... 9000 TEMPO CAVOK ...".
Clearly they are saying "Well its a bit hazy and the vis isn't quite CAVOK, but you might get above 10km every so often" - just the first time I'd seen CAVOK mentioned in a TEMPO thats all. Probably old news, nothing to see here, move along now and discuss someone going around somewhere
And they were right too!
Paul