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A severe weather warning remains in place for heavy rainfall and flash flooding for the Illawarra and metro areas on Friday morning, with six-hourly rainfall totals most likely between 40 and 60mm and isolated totals of 100mm possible.
Areas of particular concern for flash flooding are Wollongong, Nowra, Bowral, Campbelltown, Huskisson and Ulladulla.
It comes after parts of NSW were drenched overnight with Cringila, a suburb south of Wollongong, copping 206mm of rain in 19 hours. Sydneysiders were startled by huge thunderclaps and bright lightning strikes on Thursday night and experienced a soggy 57mm in 19 hours.
Flash flooding is also affecting the transport network with buses replacing trains on the South Coast Line between Wollongong and Port Kembla, and between Thirroul and Waterfall.