Thursday 6th of June 10.22a.m. Heavy showers o'nite and this morning. 10mm in my rain guage. Light 9.3 / 13kph SSW, Hg 65%, 14.6 / 58.5F top of 17C / 63F. Rain. Possible heavy falls. Marine wind warning. Flood watch. Sheep graziers alert. Severe weather warning - heavy rain.
Moon is 0.5%
BOM issues flood warnings as Sydney and south-east NSW faces another major wet weather event, heavy rain expected
4 hours ago
By ABC meteorologist Tom Saunders
The heaviest of rain will fall on Thursday, impacting Sydney down to Ulladulla in the Shoalhaven. (ABC News: Abbey Haberecht)
Up to 250 millimetres of rain could soak parts of south-east NSW during the next 24 hours as another major weather event unfolds across the state.
The drenching is the result of a similar weather pattern to last weekend, however on this occasion the heaviest rain will land further south, prompting the Bureau of Meteorology to issue a flood watch for at least a dozen rivers from the Hawkesbury to the South Coast as rain falls on wet catchments and produces significant runoff.
For Sydney, the system could easily bring another 100mm, boosting the city's 2024 rain total close to the annual average less than halfway into the year.
And while rain is arriving in abundance, our ski slopes remain mostly bare, ensuring a limited opening to the snow season this King's birthday long weekend.
Three-day drenching underway across central and southern NSW
After last weekend's soaking, another extensive cloudband has now formed over NSW, triggering a flood watch from the Hawkesbury-Nepean, through Sydney and the
Illawarra to the Moruya River.
The first drops from the current system commenced falling on Wednesday as a pool of polar air, called an upper low, drifted across the state's west — although rain remained light and patchy yesterday due to a relatively dry atmosphere.
Rain then became steadier overnight across the east as the upper low moved towards the coast and interacted with warmer, moister air off the Tasman Sea.
Rain will increase even further today as the clash of cold and warm air masses initiates the development of a low pressure system offshore – repeating the pattern from last weekend when an offshore low generated Sydney's wettest June day in more than three decades.
The heaviest falls on Thursday should impact the region from about Sydney to Ulladulla where more than 100mm is possible in just 24 hours.
Some modelling even indicates parts of the Illawarra could see up to 250mm, more than a month's worth of rain and enough to trigger areas of flash flooding.
Sydney on track for one of the wettest years on record
Sydney's rainfall at Observatory Hill has been above average every month this year, except for March, and the city's total for 2024 now exceeds 1,000mm, well above the average to early June of just over 600mm.
Heavy falls this week will boost Sydney's 2024 rainfall even closer to the annual average of 1,222mm, and with more than 6 months remaining in the year a platform is now set for one of the wettest years on record.
Analysing previous year's rainfall at Observatory Hill shows that even without any further rain this month, the first half of 2024 would still rank as the second wettest since 1990 – only behind the all-time record wet 2022 which had already produced more than 1,500mm by the end of May.
The result of another wet year for Sydney is not only green gardens and flowing creeks, but also a full supply of water as Warragamba Dam again threatens to spill during the coming days.