The spiders are clamouring for high, dry ground, and as a result millions of them are creating webs where they normally wouldn't. The experts believe that they are juvenile wolf spiders (which are normally ground dwelling ones.)
Check out these pics -
Information gotten from ninemsn.com.au
There's a brilliant photo of the webs, with a dog walking underneath them. I nearly showed that photo, but it creeped me out way too much.
The second picture looks like it had been snowing!
Ahem. That's neat, though.
(It's like a zombie apocalypse! Awesome to think about, but not something you actually want to see in real life.)