I recall a few years ago when we got transferred to centre after t/off enroute ML-SY we where told SY now had a hazard alert due a strong Sthl'y now forecast requiring an additional 60 holding on top of the usual BS traffic fuel, nothing on the TAF about that an HR before at the planing stage just a FM period which would require a Rwy change, had to turn around go back for more gas and a new COBT, you can guess the clutter truck that created!
I'd hate to imagine if a single snow flake fell on Syd, they'd close the Airport for good! -
