Rain is soaking southern parts of South Australia as a low pressure trough crosses the state, with some places already picking up their heaviest rain in over a year. Totals of 10-20mm were a commonplace across districts ranging from the West Coast to the Mount Lofty Ranges, with the Eastern Eyre Peninsula seeing the heaviest falls. Cowell saw the state's highest fall, picking up 27mm to 9am this morning. This was the town's heaviest rain in a year and a half, and the heaviest April rain in 43 years of records. Kimba not far from Cowell received more than its monthly average rainfall in one day with 24mm. This was also the town's heaviest April fall in 13 years. Totals in Adelaide were generally light, with most suburbs seeing less than 5mm. However, places just north of the SA capital picked up some handy falls. Roseworthy saw 13mm, its heaviest rain since February and also its heaviest April fall in four years. Gawler received 12mm, its heaviest rain since winter. As the trough continues to drift slowly across the state today, rain areas should continue. A further 5-10mm is likely today in southeastern parts of the North West Pastoral, Flinders and the Mid North, with some places possibly seeing up to 15mm. Unfortunately, the band of rain is fairly narrow, with places north and south of it unlikely to pick up more than 2mm. By Tuesday, the trough will begin to weaken. Although patchy rain should linger, falls are likely to be generally less than 5mm with isolated falls of up to 10mm possible. On Wednesday, only very light falls are likely in the east, with partly cloudy and drier conditions returning to the remainder of SA as a high pressure system crosses the state.