Authorities have urged tourists near Western Oz’s Exmouth to evacuate as a trifecta of powerful storms are set to bring strong winds, heavy rain and high tides. While the initial collision of 2 storm systems – called the Fujiwhara effect – was already a pretty rare occurrence, a 3rd system has formed nearby. Experts say the party-crashing low-pressure system is unlikely to interact with the others, but it is expected to bring dangerous conditions across the coastline. Meanwhile, those in Australia’s southeast will today see their last day of sunshine for a bit as a “polar blast” from Antarctica hits this weekend. “This will be the last time we see the high 20s and low 30s until next spring,” meteorologist Jonathan How said. Time to bring out the winter woollies…