Perth and the South West are set to be pummelled by "tornado-strength" wind gusts and dangerous swells in "once in five-year" storm.

The Bureau of Meteorology is warning the “deep low” system will begin impacting west-facing towns as far north as Geraldton as of Saturday evening, before moving down the coast…

Perth and the South West are set to be pummelled by "tornado-strength" wind gusts and dangerous swells in "once in five-year" storm.