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Water storage for Perth is currently at 36.6% of capacity, which is lower than any other Australian capital city, but moisture from the tropics will fuel much needed rainfall across southwest WA this week. As seen below, a low pressure system located offshore from the Gascoyne is tapping into abundant moisture from the tropics and it will be directing that moisture over southwest WA this week. Image: Animation of water vapour imagery on 26 April 2026. Source: Weatherzone. This moisture will fuel widespread rain across southwest WA on Monday with the potential for isolated thunderstorms and hea