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The thunderstorms are expected to hit the Sydney suburbs of Hurstville, Kurnell and Thirroul first and Bankstown, Holsworthy and Randwick by 2.40pm.
“Other severe thunderstorms with heavy rainfall were detected on the weather radar near Sydney Airport and Botany,” the bureau said.
“They are forecast to affect Maroubra by 2.10pm.”
Woonona High School, north of Wollongong has been evacuated due to intense flooding.
Parents are being urged to pick up their children after ”extremely heavy rain” hit the Illawarra region.
A severe thunderstorm warning has also been issued for the NSW South Coast and Central West.
Earlier BoM warned “very dangerous thunderstorms with intense rainfall” would hit the coast from Sydney’s south to Nowra this afternoon.
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Heavy falls are also expected for inland areas from Orange to Yass.
“An approaching upper trough is combining with an unstable environment to trigger severe thunderstorms across New South Wales,” the bureau said.
“Severe thunderstorms are likely to produce intense rainfall that may lead to dangerous and life-threatening flash flooding over the next several hours in parts of the Metropolitan and Illawarra districts.”
A huge 380mm fell in Greenwell Point overnight, including 178mm in two hours from 4am this morning.
Sydney Airport recorded 62mm overnight and Shellharbour Airport recorded 73mm in one hour to 10.45am.
The State Emergency Service (SES) is warning residents to keep clear of creeks, be aware of flash flooding and to stay indoors.
The SES is also reminding people not to walk, ride or drive through flood water.
