'Severe' thunderstorms could bring rain, wind, hail to millions

The Bureau of Meteorology has warned that thunderstorms could beryllium wide crossed overmuch of New South Wales today.

Residents successful parts of nan authorities are facing yet different activity of dense rainfall and nan imaginable for flash flooding arsenic an extended unreality set moves crossed Australia.

A low-pressure strategy and acold beforehand will push nan set from South Australia to nan eastbound seashore coming and tomorrow.

The upwind strategy has nan imaginable to bring six-hourly rainfall totals betwixt 60 to 100mm of rainfall from this evening for parts of nan confederate Illawarra, bluish South Coast and eastbound Southern Tablelands.

According to nan Bureau of Meteorology, parts of nan seashore could spot 24-hour totals up to 140mm.

The Bureau besides posted connected X to opportunity thunderstorms could beryllium "extensive".

"Storms could go severe, pinch dense rainfall, damaging upwind and ample hailstones each imaginable outcomes," BoM's station said.

"Thunderstorm Warnings will beryllium issued if this happens. Its a bully time to enactment up to date."

Severe upwind warnings are successful spot for Lord Howe Island, the Illawarra, parts of nan South Coast, and nan Southern Tablelands.

Just one, minor, flood informing is successful spot for nan Namoi River arsenic of Wednesday morning.

Sydney is forecast to spot 15mm to 45mm of rainfall today, pinch falls tailing disconnected toward nan evening.

Bureau of Meteorology elder meteorologist Miriam Bradbury said residents connected nan seashore were apt to spot damaging upwind gusts and waves arsenic nan upwind strategy hovered complete nan coast.

"It will linger location and tie successful moisture and beardown winds, directing them against nan seashore and perchance starring to further terrible upwind for areas betwixt nan Hunter and nan South Coast," she said

Over nan adjacent 2 days, nan bedewed upwind will besides summation for bluish Victoria and confederate Queensland arsenic nan rainband and low-pressure strategy commencement to hindrance and nutrient wide rainfall and thunderstorms.

"We will spot mean rainfall totals for immoderate of these areas, particularly for overmuch of eastbound and south-eastern NSW but besides north-eastern Victoria and terrible thunderstorms are imaginable again pinch nan consequence of damaging winds and dense rain," elder meteorologist Jonathan How said.

"On Wednesday, Sydney and Canberra will spot a wet, acold and rainy time while Melbourne and Adelaide will besides spot showers."

DOWNLOAD THE 9NEWS APP: Stay crossed each nan latest successful breaking news, sport, authorities and nan upwind via our news app and get notifications sent consecutive to your smartphone. Available connected the Apple App Store and Google Play.