A low pressure system is generating a series of cold fronts that are likely to affect WA later this week. These will produce shower activity and potentially thunderstorms. The first of these on Wednesday will bring isolated falls of 10-20mm, with the second system on Friday indicating more widespread falls of between 15-30mm for parts of southwestern WA. 

Image 1: 24 hour rainfall totals from ECMWF for Thursday morning 30^th September

Image 2: 24hour rainfall totals from ECMWF model for Saturday morning 2^nd October