At Sydney airport, where visibility was cut to 400 meters, flights were canceled while several international flights were diverted to Melbourne, where flights were also delayed, as they were at Brisbane airport in Queensland.
Barry Hanstrum, a weather official at the NSW meteorology bureau, said the storm was "one of the worst, if not the worst. An event like this is extremely rare."
As you might imagine, photographers in Australia -- professionals and amateurs alike -- got out to capture the spectacle. I don't have permission to copy photos that I've seen taken by these photographers Down Under, but here are some links you can check out to see what it was all about.
Story and video of storm from Sydney
Photoartgallery.com site photo gallery