This one is a different I'd suggest. Our usual invasion is earlier in the year - May? - and comes from The Bermuda Triangle where the currents converge and form a mass of weed and rubbish the size of a large US State and once a year as the world currents switch we get a ton.

The big difference with this dump is the timing and this is just weed with virtually no rubbish. So I'd guess this load is from a different source due to some weird change in current or maybe the Planet is about to explode.