Thunderstorms swept over Western Australia's southwest last night, producing damaging gusts over 100km/h. Last night Busselton Jetty clocked the strongest gust for the night of 120km/h. Other coastal areas saw gusts over 100km/h, such as Ocean Reef, Rottnest Island and Cape Naturaliste. In Perth, there were isolated gusts above 80km/h in the storms, such as at Swanbourne, but the city missed out, with gusts merely peaking at 50km/h. Rainfall from the storms was heaviest just inland of Bunbury, with up to 46mm around Dardanup. Bunbury and Perth weren't as wet, with 16mm and 13mm respectively. Today, showers are continuing along the coast, heading towards a peak during the afternoon. In the south there is the risk of a couple of weak thunderstorms with stray lightning strikes, but unlikely to be nearly as serious as what occurred overnight. Light and isolated showers will come and go during the week until they increase on Thursday with the arrival of a cold front. Behind this next front a high pressure system will take over, bringing extra sunshine and calmer winds.