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Heavy rain across SW WA
Wet weather returned to southwestern WA with the fronts and troughs that crossed the state from last Tuesday to Saturday. They were brought by a succession of lows that passed close to the south coast, bringing wild weather, storms and high wind gusts as well as torrential rain as the fronts moved through.
Early Thursday afternoon a severe thunderstorm gave Albany Airport a wind gust of 139km/h while, for a time on Friday, almost all southern parts of the state were under Severe Weather Warnings. Everywhere west of a line from Jurien Bay to Wagin to Albany recorded at least 25mm during the week to 24 September with falls over 100mm in the mountains NE of Bunbury where Mount William registered 129mm over three days.
The heaviest rain fell overnight into Thursday 21 September to the south of Perth. The area between Mandurah and Bunbury saw the heaviest of it, with the BoM tweeting a warning of possible flash flooding. Wokalup, 65km S of Mandurah, had its heaviest September day's total in over 60 years of records with 53.0mm in the 24 hours to 09.00 on Thursday 21 September. In the mountains to its NE, Mount William scored 88.4mm and Dwellingup 42.0mm. Good falls spilt over the ranges into western parts of the wheatbelt giving Williams 35.2mm.
On Friday morning, 22 September, with the passage of an active frontal system, wind gusted to 100km/h at Ocean Reef in Perth's northern beachside suburbs, 96km/h on Rottnest Island, 93km/h at Cape Naturaliste and 91km/h at Busselton Jetty. In the early afternoon, Bickley saw a gust of 96km/h and Gooseberry Hill 111km/h in Perth's outer east, while Ocean Reef recorded 104km/h.
Heavy rain continued in the 24 hours to 09.00 Friday 22 September with the heaviest totals a little farther south around Collie, where Worsley Downs topscored with 58.0mm. By later Friday into Saturday, rain had moderated and moved to the South Coast as another low system moved past close to shore. In the 24 hours to 09.00 on Saturday Albany had the highest rainfall with 33.4mm followed by 24.4 at Northcliffe and 23.0 at North Walpole.