Anyone know what’s up with all the flight cancellations in Australia today?

Seems like Qantas, Virgin, and Jetstar all had mass cancellations today across Brisbane, Sydney, Melbourne, and Perth. It’s also the last day of school holidays here, so it’s been chaos.

I almost got stuck in Sydney trying to fly to Brisbane with Jetstar. They blamed “weather,” but it’s weird how it hit so many cities at once. Anyone know what actually happened?