Stormy end to southwest WA's driest autumn

16:17 AEST The taps turned on during the opening days of winter in the southwest of WA, after some areas recorded the driest autumn on record.  The rain and thunderstorms over the weekend were triggered by a strong cold front sweeping across the state, interacting with tropical moisture and the warm sea surface temperatures off the WA coastline.  The image below shows a line of thunderstorms marching towards the state’s southwest on Saturday night.  Image: Radar and lightning for the three hours leading up to 11pm AWST on Saturday, June 1.  This line of storms brought Perth a third of their average monthly rainfall, with 42.2mm falling in just 10 and a half hours leading up to 9am on Sunday, June 2.