Rain is easing across western Queensland as a monsoon low takes the heaviest falls into western NSW, where flooding is now likely. The low has dumped 150-to-250mm of rain over parts of western Queensland in the last few days, some seeing their heaviest falls in many years, which has led to flooding. Springsure, east of Longreach recorded 172mm in the last 24 hours, its heaviest rain in 36 years and heaviest January rain in 125 years of records. Rain has been heavier and flooding more severe further west. Cowley, southeast of Quilpie has had more than 250mm in the past 48 hours, its wettest two day period since records began in 1884. Also in the Quilpie area, Humeburn gained 185mm in 24 hours, which is a three-year high. Quilpie itself had 64mm, a one-year high. Earlier on the weekend, Cloncurry, in the state's northwest ammassed 196mm, its highest daily rain in 21 years. The biggest rain is heading across the New South Wales border with the southerly movement of the low. There is potential for more than 50mm in Sunday, west of about Bourke, Cobar and Hay, which may bring some flooding. On Monday moisture from this weakening low will be drawn into a trough ahead of a front, bringing widespread rain and thunderstorms to southern NSW, Victoria and Tasmania. Flash flooding is a possibilty. From Tuesday, the trough will head east and take rain and storms across central and northern NSW and back to western Queensland. There's potential for in excess of 100mm with a good chance for further flooding. Some rain will also reach the east coast, including the recently-flooded Mid North Coast.