Summarize this content to 2000 words in 6 paragraphs A severe thunderstorm has drenched Sydney, with the massive downpours and life-threatening flash-flooding inundating roads and disrupting public transport.The large weather system passed over the Blue Mountains and western Sydney by late morning and hit the city about midday, with people warned to stay indoors.The NSW SES is set to give an update on the situation in the livestream link below.The storm dumped 87.8 millimetres on Horsley Park in western Sydney. More than 52 millimetres drenched Observatory Hill in the city, while 45.6 millimetres were recorded in Penrith.Roads across Sydney were flooded with knee-high water, including Bridge Road near the Fish Market, at Riverstone in the city’s north-west and Rushcutters Bay in the east.The storm also left Sydney’s public transport on its knees. Light rail services on the L2 Randwick and L3 Kingsford Line were closed due to flooding. Flooding at Strathfield railway station also led to delays across multiple train lines.Further thunderstorms could hit Sydney into the late afternoon and evening, and the Bureau of Meteorology is predicting the chance of less severe thunderstorms on Tuesday before conditions ease on Wednesday.The bureau warned that Gosford, Sydney, Orange, Katoomba, Dubbo and Parkes were of particular concern.
