After a dry start to winter much of western and southern WA can expect widespread rain over the next few days. Cloud thickened over the west coast during Thursday as a trough deepened off the coast with light rain falling north of Perth by 5pm, including 5mm at Morawa, already their heaviest fall in 2 months. The rain will increase overnight and spread further inland as the trough draws moist tropical air south from the Indian Ocean. The heaviest falls on Friday should be between about Geraldton and Shark Bay where upwards of 25mm is likely, but light patchy falls should stretch south to Albany and west to the Eucla coast. A front will maintain rain across the west and south of the state through Saturday, lifting totals by Sunday to at least 20mm from Albany to Exmouth. Rain will be lighter inland but much of the Central Wheat Belt and Great Southern should receive at least 10mm.