Powerful thunderstorms have been drenching southwestern Australia, with some locations recording their wettest day in over a decade. A slow moving low pressure trough has been producing a long train of thunderstorms near the west coast of WA since the middle of Thursday. The slow moving nature of the system has meant that some areas have seen multiple thunderstorms. The South West has been the wettest district so far, with Jarrahwood drenched by 93mm - its wettest day in 24 years. Nearby Bridgetown had 86mm and Busselton 64mm, their wettest in 12 and 10 years respectively. Further north, Bencubbin had 43mm, its wettest day since 2001. On the coast, Jurien Bay recorded 39mm, its heaviest fall in 2 years. Perth has missed out on the wettest weather, with only 18mm falling in the gauge. The city has rounded out the month below average, with a total of 102mm. Today, the trough is moving further inland, bringing the heaviest rain and storms with it. The focus in the next 24 hours should be across the Central Wheat Belt and southern parts of the Goldfields. An associated low pressure system following the trough will bring isolated showers to the west coast during the next 24 hours before conditions improve across WA by Sunday morning.